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Publication numberCN102027538 A
Publication typeApplication
Application numberCN 200980117453
PCT numberPCT/IB2009/052440
Publication date20 Apr 2011
Filing date9 Jun 2009
Priority date18 Jun 2008
Also published asCA2717616A1, CA2717616C, CN102027538B, EP2301030A1, EP2301030B1, US8027111, US20090316773, WO2009153702A1
Publication number200980117453.X, CN 102027538 A, CN 102027538A, CN 200980117453, CN-A-102027538, CN102027538 A, CN102027538A, CN200980117453, CN200980117453.X, PCT/2009/52440, PCT/IB/2009/052440, PCT/IB/2009/52440, PCT/IB/9/052440, PCT/IB/9/52440, PCT/IB2009/052440, PCT/IB2009/52440, PCT/IB2009052440, PCT/IB200952440, PCT/IB9/052440, PCT/IB9/52440, PCT/IB9052440, PCT/IB952440
InventorsES伊莱夫特希里欧, G切鲁比尼, J杰里托, RD西德西扬
Applicant国际商业机器公司
Export CitationBiBTeX, EndNote, RefMan
External Links: SIPO, Espacenet
Word synchronization for servo read signals in tape drives
CN 102027538 A
Abstract
Methods and apparatus are provided for detecting L-bit sync words occurring at N-bit intervals in PPM-encoded servo pattern read signals read from magnetic tape (3) in tape drives (1). A soft output detector (11) processes the PPM-encoded servo pattern read signal to produce a series of soft output samples corresponding to respective bits encoded in the servo pattern. A sync word detector (12) then produces block correlation values for respective positions of a sliding L-sample block in the soft output sample series. The block correlation values are produced by calculating, at each block position, bit correlation values indicating correlation between respective samples and corresponding bits of the sync word, and summing each bit correlation value minus a predetermined function of the corresponding sample value. The sync word detector (12) then detects a sync word at the block position with the maximum block correlation value in an (N+L-1)-sample sequence of the soft output sample series.
Claims(15)  translated from Chinese
1. 一种用于检测在从带驱动器(1)中的磁带(3)读取的PPM编码伺服图案读取信号中的N位间隔上出现的L位同步字的字同步化设备(10),所述字同步化设备(10)包括:软输出检测器(11),用于处理PPM编码伺服图案读取信号以产生与在伺服图案中编码的各位对应的软输出采样系列;和同步字检测器(12),用于通过在各块位置上计算表示各采样和同步字的相应位之间的相关性的位相关值,并将各位相关值相加并减去相应采样值的预定函数,来产生滑动L 采样块在软输出采样系列中的各位置的块相关值;其中,同步字检测器(12)适于用软输出采样系列的(N+L-1)采样序列中的最大块相关值来检测块位置上的同步字。 1. A method for detecting the PPM-encoded servo pattern read from the tape drive (1) of the tape (3) to read word synchronization device appears on the signal N bits spaced L-bit synchronization word (10) the word synchronization device (10) comprising: a soft output detector (11) for processing the PPM-encoded servo pattern read signal to produce encoded in the servo pattern you soft output samples corresponding to the series; and the sync word predetermined function detector (12) for the correlation between the value of the corresponding bit of each bit associated sampling and synchronization between words by calculating the position of each block, it said, and adding and subtracting the corresponding sample values of the correlation values you to produce a sliding block correlation values L sample blocks in the soft output sample series each position; the largest of which, the sync word detector (12) adapted for use (N + L-1) sample sequence soft output sample series of block correlation values to detect sync block position.
2.如权利要求1所述的设备,其中,所述预定函数包含由下式定义的函数h(u): 2. The apparatus according to claim 1, wherein said predetermined function comprises a function defined by h (u):
Figure CN102027538AC00021
其中,u是软输出采样值;Es是表示在伺服图案中编码的各位值的PPM编码信号 Where, u is the soft output sample value; Es is PPM encoded signal encoded in the servo pattern you value
Figure CN102027538AC00022
的能量; 识= 唭中,T是编码位周期;并且SNR是读取信号的信号噪声比。 Energy; knowledge = Qi, T is encoded bit period; and SNR is the signal to noise ratio of a read signal.
3.如权利要求1所述的设备,其中,所述预定函数包含软输出采样值的模数。 3. The apparatus according to claim 1, wherein said predetermined number modulo function comprises soft output sample value.
4.如任一在前权利要求所述的设备,其中,软输出检测器(Ila)包含:信号采样产生器(13),用于在编码位周期T内产生伺服图案读取信号的信号采样η。 4. The apparatus according to any one of the preceding claims, wherein the soft output detector (Ila) comprising: signal sampling generator (13), the servo pattern read signal for generating signal samples in the coded bit period T η. 的集合,其中,J是索引的集合;和软输出产生器(14a),用于从信号采样I^j产生以下形式的软输出采样u: The collection, which, J is the index of the collection; and soft output generator (14a), for I ^ j from signal samples to produce the form of soft output samples u:
Figure CN102027538AC00023
其中,s(t)和sHt)是表示在伺服图案中编码的并在与相关的信号采样η对应的采样定时上取得的各位值的PPM编码信号的采样,并且,求和是在索引的集合J的至少一个子集上进行的。 Wherein, s (t) and sHt) is a sampling PPM encoded signal you value encoded in the servo pattern and associated signal samples η corresponding sampling timings made, and the sum is in the index J set on at least a subset of sets.
5.如权利要求1-3中的任一项所述的设备,其中,软输出检测器(lib)包含:信号采样产生器(13),用于在编码位周期T中产生伺服图案读取信号的信号采样η。 5. according to any one of claim 1 to 3 apparatus, wherein, the soft output detector (lib) comprising: signal sampling generator (13), for generating a coded bit period T of the servo pattern read Signal sampling signal η. 的集合,其中,J是索引的集合;和软输出产生器(14b),用于从信号采样ηΜ产生以下形式的软输出采样u: Collection, wherein, J is an index set; and a soft output generator (14b), for generating from the signal samples form ηΜ soft output sample u:
Figure CN102027538AC00024
其中,s(t)和sHt)是表示在伺服图案中编码的并在与相关的信号采样η对应的采样定时上取得的各位值的PPM编码信号的采样,并且,求和是在索引的集合J的至少一个子集上进行的。 Wherein, s (t) and sHt) is a sampling PPM encoded signal you value encoded in the servo pattern and associated signal samples η corresponding sampling timings made, and the sum is in the index J set on at least a subset of sets.
6.如权利要求4或5所述的设备,其中,所述求和是在索引的集合J的子集上进行的。 4 or 5, wherein the device according to claim 6, wherein the sum of the index is set in a subset of J.
7.如权利要求4-6中的任一项所述的设备,其中,信号采样产生器(13)包含: 采样器(15),用于以固定的采样频率对读取信号采样;和内插器(16),用于内插固定频率采样以便对于单位带长度,以固定的速率产生所述信号采样η e ,。 7. The apparatus as claimed in any one of claims 4-6, wherein the signal sample generator (13) comprising: a sampler (15), for a fixed sampling frequency of the read signal samples; and the interpolator (16), fixed frequency sampling for interpolating unit with respect to the length of the fixed rate to generate signal samples η e,.
8.如任一在前权利要求所述的设备,其中,所述设备适于处理TBS伺服图案读取信号以检测PPM编码的LPOS同步字。 8. The apparatus as claimed in any one of the preceding claims, wherein the apparatus is adapted to process TBS servo pattern read signal to detect a PPM-encoded LPOS sync word.
9. 一种带驱动器(1),包括:读取/写入头(2),用于在磁带(3)上读取和写入数据;与读取/写入头(2)相关的伺服读取器(5),用于读取磁带(3)上的PPM编码伺服图案以产生伺服图案读取信号;和伺服控制器(8),用于处理伺服图案读取信号以产生用于控制带(3)和读取/写入头(2)的相对定位的位置信息;其中,伺服控制器(8)包含如任一在前权利要求所述的字同步化设备(10)。 A tape drive (1), comprising: a read / write head (2) for the tape (3) to read and write data; and a read / write head (2) associated servo reader (5), for reading the magnetic tape PPM-encoded servo pattern (3) to produce a servo pattern read signal; and a servo controller (8) for processing the servo pattern read signal to produce a control for strip (3) and the read / write head (2) relative positioning position information; wherein the servo controller (8) comprising as claimed in any one of the preceding claims word synchronization device (10).
10.—种用于检测在从带驱动器(1)中的磁带(3)读取的PPM编码伺服图案读取信号中的N位间隔上出现的L位同步字的方法,所述方法包括:处理PPM编码伺服图案读取信号以产生与在伺服图案中编码的各位对应的软输出采样系列;通过在各块位置上计算表示各采样和同步字的相应位之间的相关性的位相关值,并将各位相关值相加并减去相应采样值的预定函数,来产生滑动L采样块在软输出采样系列中的各位置的块相关值;和用软输出采样系列的(N+L-1)采样序列中的最大块相关值来检测块位置上的同步字。 10.- method for detecting the PPM-encoded servo pattern read from the tape drive (1) of the tape (3) to read the signal appearing on the N-bit interval L-bit sync word, said method comprising: processing the PPM-encoded servo pattern read signal to produce a servo pattern corresponding to respective bits encoded in the soft output sample series; each block by calculating the correlation between the position of the bit represents the correlation value of each sample and the corresponding bits between the synchronization word and everybody correlation value and subtracting a predetermined function corresponding sample values to produce a sliding block correlation values L sample blocks in the soft output sample series each position; and the use of (N + L- soft output sample series 1) sampling sequence the maximum block correlation value to detect sync block position.
11.如权利要求10所述的方法,其中,所述预定函数包含由下式定义的函数h(u): 11. A method as claimed in claim 10, wherein said predetermined function comprises a function defined by h (u):
Figure CN102027538AC00031
其中:u是软输出采样值;Es是表示在伺服图案中编码的各位值的PPM编码信号8(0和S1 (t)的能量; Where: u is the soft output sample value; Es is PPM encoded signal encoded in the servo pattern you value 8 (0 and S1 (t) of energy;
Figure CN102027538AC00032
其中,T是编码位周期;并且SNR是读取信号的信号噪声比。 Wherein, T is the encoded bit period; and SNR is the signal to noise ratio of a read signal.
12.如权利要求10所述的方法,其中,所述预定函数包含软输出采样值的模数。 12. A method as claimed in claim 10, wherein said predetermined number modulo function comprises soft output sample value.
13.如权利要求10-12中的任一项所述的方法,包括: 通过以下步骤产生软输出采样:在编码位周期T内产生伺服图案读取信号的信号采样ηU的集合,其中,J是索引的集合;和从信号采样η e J产生以下形式的软输出采样u : 13. The method according to any one of claims 10-12, comprising: the steps of generating a soft output sample: a servo pattern read signal to produce a set of signal samples in ηU coded bit period T, wherein, J It is the index of the collection; and from the signal samples produced the following form η e J soft output sample u:
Figure CN102027538AC00033
其中,S(t)和sHt)是表示在伺服图案中编码的并在与相关的信号采样η对应的采样定时上取得的各位值的PPM编码信号的采样,并且,求和是在索引的集合J的至少一个子集上进行的。 Wherein, S (t) and sHt) is a sampling PPM encoded signal you value encoded in the servo pattern and associated signal samples η corresponding sampling timings made, and the sum is in the index J set on at least a subset of sets.
14.如权利要求10-12中的任一项所述的方法,包括:通过以下步骤产生软输出采样:在编码位周期T内产生伺服图案读取信号的信号采样ηu的集合,其中,J是索引的集合;和从信号采样η ej产生以下形式的软输出采样u : 14. The method according to any one of claims 10-12, comprising: the steps of generating a soft output sample: a servo pattern read signal to produce a set of signal samples in ηu coded bit period T, wherein, J It is the index of the collection; and η ej generated from the signal samples in the form of soft output samples u:
Figure CN102027538AC00041
其中,s(t)和sHt)是表示在伺服图案中编码的并在与相关的信号采样η对应的采样定时上取得的各位值的PPM编码信号的采样,并且,求和是在索引的集合J的至少一个子集上进行的。 Wherein, s (t) and sHt) is a sampling PPM encoded signal you value encoded in the servo pattern and associated signal samples η corresponding sampling timings made, and the sum is in the index J set on at least a subset of sets.
15.如权利要求13或14所述的方法,包括:通过以固定的采样频率对读取信号采样以及内插固定频率采样,对于单位带长度以固定的速率产生所述信号采样η u,来产生所述信号采样。 15. The method according to claim 13 or claim 14, comprising: a fixed sampling frequency of the read signal is sampled and interpolated fixed sampling frequency, the length of the unit with a fixed rate to produce said signal samples η u, to generating said signal samples.
Description  translated from Chinese

带驱动器中的伺服读取信号的字同步化 Word tape drive servo read signal synchronization

技术领域 Technical Field

[0001] 本发明一般涉及带存储系统中的伺服读取信号的字同步化。 [0001] the word with the storage system servo read signal of the present invention generally relates to synchronization. 更特别地,提供用于检测从带驱动器中的磁带读取的脉冲位置调制(PPM)编码伺服图案读取信号中的同步字的方法和装置。 More particularly, there is provided a method and apparatus for detecting a pulse position modulation is read from the tape drive tape (PPM) encoded servo pattern read signal synchronization word.

背景技术 Background

[0002] 一般地,同步数字通信接收器包含诸如符号同步化和字同步化(也称为帧同步化)子系统的各种类型的同步化子系统。 [0002] In general, synchronous digital communications receiver includes symbols such as synchronization and word synchronization of various types of synchronization subsystem (also known as frame synchronization) subsystem. 假定已实现符号同步化,那么字同步化的任务包含确定接收的数据流内的同步字的位置。 Assume symbol synchronization has been achieved, then the word synchronization tasks including the synchronization word in the received data stream to determine the location. 在“Frame synchronization techniques,” RAScholtz, IEEE Trans.on Commun., vol.28, August 1980,pp.1204-1213 中描述了用于字同步化的各种技术。 In "Frame synchronization techniques," RAScholtz, IEEE Trans.on Commun., Vol.28, August 1980, pp.1204-1213 describes various techniques for word synchronization. 在关于字同步化的早期工作中,引入相关判决规则的概念(参见RHBarker, "Group synchronization of binary digital systems, ” in Communication Theory, W.Jackson, Ed丄ondon.Butterworth,1953,pp.273-287)。 In the early work on the word synchronization, the introduction of the concept of the relevant decision rule (see RHBarker, "Group synchronization of binary digital systems," in Communication Theory, W.Jackson, Ed Shang ondon.Butterworth, 1953, pp.273-287 ). 根据该规则,接收的数据流中的位与各个同步字位和在最大相关性的位置上检测的同步字相关。 According to this rule, the received data stream bits with each sync word bits and in a position of maximum correlation detected synchronization word correlation. 美国专利No.5,073,906在移动卫星通信接收器中使用用于软输出采样的相关技术,其中,采样与同步字位相关,以产生与依赖于同步字检测的平均功率的阈值相比较的互相关值。 U.S. Patent No.5,073,906 related art soft output samples for satellite communication in a mobile receiver, wherein the synchronization word bits associated with the sample, to generate a sync word detection is dependent on the average power of the threshold value of the cross-correlation value . In

"Optimum framesynchronization, ” JLMassey, IEEE Trans.on Commun., vol.20, April 1972,pp.115-119中提出在存在加性高斯白噪声的情况下接收的专用于对映二元信号的最佳字同步算法(还参见上面的Scholtz文献)。 "Optimum framesynchronization," JLMassey, IEEE Trans.on Commun., Vol.20, April 1972, pp.115-119 raised in the presence of additive white gaussian noise reception dedicated to the best word to reflect the binary signal synchronization algorithm (see also Scholtz literature above). 特别地,对映二元信号的最佳字同步算法的相关判决规则是由依赖于信号噪声比(SNR)的附加校正项修改的相关判决规则。 In particular, the relevant decision rule for optimum word synchronization algorithm mapping the binary signal is related to the decision to modify the rules by additional correction term depends on the signal to noise ratio (SNR) of. 也给出最佳字同步化算法的高SNR和低SNR近似。 Also gives optimum word synchronization algorithm high SNR and low-SNR approximation. 模拟结果表明,对映二元信号的最佳字同步算法的高SNR近似几乎如最佳字同步化算法一样好地执行(参见“Some optimum and suboptimum framesynchronizers for binary data in Gaussian noise”,PTNielsen, IEEETrans. on Common., vol.21, June 1973, pp.770-772)。 Simulation results show that the optimum word synchronization algorithm mapping the binary signal of the high SNR approximation performed almost as well (see "Some optimum and suboptimum framesynchronizers for binary data in Gaussian noise", PTNielsen, IEEETrans as optimum word synchronization algorithm. on Common., vol.21, June 1973, pp.770-772). 在"Framesynchronization for Gaussian channels, ” GLLui and HHTan, IEEE Trans.on Commun., vol.35, August 1987, pp.818-829中,矢量空间中的对映二元信号的最佳字同步算法可望为假定最大可能性单稳态(one shot)接收器结构的高斯信道上的相干和非相干相位解调(参见“Principles of Communication Engineering” , JMWozencraft andl.M.Jacobs,John Wiley&Sons,1965)。 In "Framesynchronization for Gaussian channels," GLLui and HHTan, IEEE Trans.on Commun., Vol.35, August 1987, pp.818-829, the vector space in the best word to reflect the binary signal synchronization algorithm is expected to assumed maximum likelihood monostable (one shot) Gaussian channel coherent and non-coherent phase demodulator receiver structure (see "Principles of Communication Engineering", JMWozencraft andl.M.Jacobs, John Wiley & Sons, 1965).

[0003] 在带存储系统中,为了在带的邻近数据轨道的纵向延伸的专用伺服轨道中记录伺服信息,使用基于定时的伺服(TBS)技术。 [0003] In the tape storage system, in order to record the servo information dedicated servo track with the adjacent longitudinally extending data track using a timing-based servo (TBS) technique. LTO(线性带开(Linear Tape Open))联盟采用TBS方法并将用于LTO带驱动器的健壮的、可裁剪的、专用的伺服图案标准化, 该伺服图案提供后向兼容性并以较高的轨道密度在后续LTO标准中保持不变。 LTO (linear tape open (Linear Tape Open)) alliance and using TBS method for LTO tape drives robust, can be cut, dedicated servo pattern standardization, backward compatibility and a higher orbit after the servo pattern offers In subsequent LTO standard density remains unchanged. 在标准ECMA-319, "Data interchange on 12.7mm 384—track magnetictape cartridges-Ultrium-1 for mat,,,June 2001, pp.48_56中详细描述了TBS伺服图案。后面详细描述的伺服图案包含用两个不同的方位角斜率限定一系列的条带的磁性转变。可从由读取条带图案的窄伺服头产生的脉冲的相对定时得到头的横向位置。TBS图案还在不影响横向位置误差信号(PES)的产生的情况下允许附加的纵向位置(LPOS)信息的编码。通过沿带的纵向从它们的标称图案位置偏移伺服图案的转变(条带),将LPOS信息编码。在伺服图案的36帧上在36位字中记录LPOS信息,每个LPOS字表示带上的特定的、绝对的纵向位置。各伺服帧由此将LPOS信息的一个位编码,该位值由伺服图案条带中的特定的偏移表示。36 位LPOS字的前8位构成已知的同步化字。由于通过偏移伺服帧条带的纵向位置来记录LPOS位,因此得到的伺服头读取信号是为了位置数据的恢复而必须识别同步字的PPM 编码信号。 In the standard ECMA-319, "Data interchange on 12.7mm 384-track magnetictape cartridges-Ultrium-1 for mat ,,, June 2001, a detailed description of the TBS servo pattern pp.48_56 The servo pattern described in detail later contain two different azimuths slope defining a series of strips of magnetic transition with relative timing pulses from the servo head by a narrow strip to produce a pattern is read to get the head of the lateral position .TBS pattern still does not affect the lateral position error signal ( Allow the case of PES) generated additional longitudinal position (LPOS) encoded information by longitudinal shift from their nominal pattern position offset servo pattern (bands), along with the encoding of LPOS information in the servo pattern on 36 LPOS information recorded in 36 words, each word represents a specific LPOS absolute longitudinal position of the tape. Each servo frame whereby one bit of information encoded LPOS, the bit value from the servo pattern stripe specific offset represents .36 bits of known synchronization word before 8 LPOS word. Since the longitudinal position of the belt by shifting the servo frame of the recorded LPOS bits, the servo head is to get a read signal and restoring the position data of the synchronization word must be identified PPM encoded signal.

[0004] LTO驱动器中的常规的字同步化系统对从PPM编码伺服图案读取信号得到的硬输出位应用校正判决规则。 [0004] LTO drives conventional word synchronization system to read from the PPM-encoded servo pattern signal output bit hard to get the application corrected judgment rule. 如我们的US专利No.7,245,450和“ Synchronous Servo Channel Design for Tape DriveSystems, ” Cherabini et al.,Proc.l7th Annual ASME InformationStorage and Processing Systems Conf.ISPS 2007, Santa ClaraUniversity, CA, June 18-19, 2007,pp.160-162详细描述的那样,通过使用遵循伺服读取信号采样的内插的匹配滤波器方法,检测硬输出位。 Such as our US Patent No.7,245,450 and "Synchronous Servo Channel Design for Tape DriveSystems," Cherabini et al., Proc.l7th Annual ASME InformationStorage and Processing Systems Conf.ISPS 2007, Santa ClaraUniversity, CA, June 18-19, 2007, pp.160-162 described in detail above, by using a servo read signal samples following the matched filter interpolation method, bit hard output detection. 在附图的图1中示出同步字检测器。 In the drawings, Figure 1 shows a sync word detector. 通过一系列的七个延迟元件D对值+1或-1的硬输出位&的流计时,这些延迟元件D的输入/输出向各 Through a series of seven delay elements D value of +1 or -1 hard output bit stream & timing delay elements D input / output each

乘法器供给八个位&、4-1..... 的滑动块。 Eight-bit multiplier supply &, 4-1 ..... sliding block. 如所示的那样,向乘法器的其它输入 As shown, the other input to the multiplier

供给已知的同步字位pQ、P1 >…、p7(其中,Ptl=I并且,对于i = l、…、7,P1 = -1)。 Known synchronization word bits supplied pQ, P1> ..., p7 (where, Ptl = I and, for i = l, ..., 7, P1 = -1). 得到的位相关值被求和,以在输出位流中的滑动8位块的各位置上产生块相关值Ck。 Bit correlation values obtained are summed to slide in the output bit stream 8 on the respective position of the block to generate block correlation value Ck. 当Ck = 8(这表示当前块和期望的同步字之间的匹配)时,向输出字同步指示符的检测器供给块相关值。 When Ck = 8 (which means that match the current block and the desired synchronization between words), the indicator of the output word sync detector supply block-related values.

[0005] 为了带驱动器的可靠操作,存在干扰和噪声时的字同步化操作的健壮性当然是十分重要的。 [0005] For the reliable operation of a tape drive, the presence of interference and noise word synchronization operation robustness of course, is very important. 读取后LPOS信息和LPOS字的同步化中的误差可在正常的驱动伺服操作中产生错误位置信息。 After reading synchronization errors LPOS information and location information LPOS word errors can occur in normal drive servo operation. 因此,希望用于带驱动器的改进的字同步系统。 Therefore, we hope for an improved belt drive word synchronization system.

发明内容 DISCLOSURE

[0006] 本发明的一个方面提供一种用于检测在从带驱动器中的磁带读取的PPM编码伺服图案读取信号中的N位间隔上出现的L位同步字的字同步化装置。 [0006] An aspect of the present invention to provide a method for detecting the PPM-encoded servo pattern read from the tape drives in the tape read the signal appearing on the N-bit interval L-bit synchronization word synchronization word means. 该装置包括: The apparatus comprising:

[0007] 用于处理PPM编码伺服图案读取信号以产生与在伺服图案中编码的各位对应的一系列的软输出采样的软输出检测器;和 Members corresponding series of soft output samples of the soft output detector [0007] for handling PPM-encoded servo pattern read signal to produce encoded in the servo pattern; and a

[0008] 用于通过在各块位置上计算表示各采样和同步字的相应的位之间的相关性的位相关值并将各位相关值相加并减去相应的采样值的预定函数,来产生软输出采样系列中的滑动L采样块的各位置的块相关值的同步字检测器; [0008] for each block by computing represents each sampling location and synchronization word corresponding bit correlation value correlation between positions and everybody correlation value and subtracting the corresponding sample values of a predetermined function to generating a soft output sample series L sampling sliding sync word detector blocks each location block correlation values;

[0009] 其中,同步字检测器适于用软输出采样系列的(N+L-1)采样序列中的最大块相关值检测块位置上的同步字。 [0009] wherein the synchronization word detector suitable for use (N + L-1) sample sequence soft output sample series of the maximum block correlation value sync word detection block location.

[0010] 上述描述的常规的LTO系统执行硬判决字同步化,由此,从硬输出位(具有已判决为两种可能的值中的一个的值)检测同步字。 Conventional LTO system [0010] The foregoing description of the implementation of the hard decision word synchronization, thus, from the hard output bits (having been judged as two possible values of a value) detecting the synchronization word. 本发明与该常规的不同在于基于软输出采样(具有尚未分解为两种可能的位值中的一个的值)提供软判决字同步化系统。 The present invention is different from the conventional soft output based on sampling (have not been broken down into two possible bit values in the value of a) providing a soft decision word synchronization system. 提供软输出检测器以从PPM编码伺服图案读取信号产生软输出采样。 Provide soft output detector to read the signals from the PPM-encoded servo pattern generating soft output samples. 同步字检测器然后执行使软输出采样的L采样块与已知的L位同步字的相应的位相关的滑动块相关操作。 Sync word detector then performs the soft output samples corresponding bit block L samples with known L-bit sync word associated sliding block related operations. 但是,不是简单地将位相关值求和,而是,同步字检测器适于在将得到的值求和之前从各采样的位相关值中减去软输出采样值的函数以产生块相关值。 However, rather than simply the sum bit correlation values, but, sync word detector adapted to subtract soft output sample value from each sample bit correlation values obtained before the values are summed to generate a block-related function value . 然后,在使来自软输出检测器的(N+L-1)采样序列中的块相关值最大化的块位置(即,对于L采样块的N个顺序的位置)上识别同步字,其中,N是PPM编码位图案中的同步字周期。 Then, when the (N + L-1) sample sequence from the soft output detector block position in the block to maximize the value of the correlation (ie, for N sequential L sample block location) to identify the synchronization word, which, N is the PPM encoded bit sync word pattern cycle. 与上述的常规系统相比,本发明的实施例提供误差率性能的大大改善。 Compared with the conventional system described above, embodiments of the present invention provide greatly improved error rate performance. 这导致操作效率提高,并且对于被设想为支持多千兆字节带盒的高轨道密度是特别有利的。 This leads to improved operational efficiency, and is conceived as a support for multi-gigabyte high track density tape cartridge is particularly advantageous. 并且,当前LTO带头组件跨过数据带段和在数据带段的任一侧运行的两个伺服带段。 Moreover, the current LTO data tape segments across leading component and two servo band on either side of the data segment with segment operation. 因此,来自两个单独的伺服头的信息通常对于横向定位数据头是可用的。 Thus, information from two separate servo head is positioned generally transverse to the header data is available. 但是,如果伺服头之一被弄脏或缩短,那么只有一个伺服信道是可用的。 However, if one of the servo head is dirty or shortened, then only one servo channel is available. 在这种情况下,使用本发明的字同步系统提供大大提高的性能。 In this case, the use of the word synchronization system of the present invention provide greatly improved performance. 总体上,本发明的实施例提供大大优于常规的方法的有效和健壮的字同步化系统。 Generally, embodiments of the present invention provide significantly better than conventional methods of effective and robust word synchronization system.

[0011] 以下详细描述可在计算块相关值中使用的预定函数的特别形式。 Description of particular forms predetermined function can be used in the calculation block correlation values [0011] The following detailed. 另外,将描述提供特别有效的实现的优选实施例。 Further, description will provide particularly efficient implementation of the preferred embodiment. 特别地,以下详细描述产生这种系统的软输出的特定形式的优选软输出检测器的构造。 In particular, the following detailed description of a particular form of generating a soft output of such a system of the preferred configuration of the soft output detector.

[0012] 本发明的第二方面提供带驱动器,该带驱动器包含: [0012] The second aspect of the present invention to provide a tape drive, the tape drive comprising:

[0013] 用于在磁带上读取和写入数据的读取/写入头; [0013] for reading and writing data on the tape read / write head;

[0014] 与用于读取磁带上的PPM编码伺服图案的读取/写入头相关的、用于产生伺服图案读取信号的伺服读取器;和 [0014] and for reading the PPM-encoded servo pattern read on the tape / write head associated with, for generating a servo pattern read signal of the servo reader; and

[0015] 用于处理伺服图案读取信号以产生用于控制带和读取/写入头的相对定位的位置信息的伺服控制器, [0015] for processing servo pattern read signal to produce a control zone and read for / write head relative positioning servo controller position information,

[0016] 其中,伺服控制器包含根据本发明的第一方面的字同步化装置。 [0016] wherein, the servo controller comprising synchronization apparatus according to a first aspect of the present invention the word.

[0017] 本发明的第三方法提供一种用于检测在从带驱动器中的磁带读取的PPM编码伺服图案读取信号中的N位间隔上出现的L位同步字的方法。 The third method [0017] The present invention provides a method for detecting the PPM-encoded servo pattern read from the tape drive to read the tape appears on the N-bit signal interval L-bit sync word. 该方法包括: The method comprising:

[0018] 处理PPM编码伺服图案读取信号以产生与在伺服图案中编码的各位对应的一系列软输出采样; [0018] The processing PPM-encoded servo pattern read signal to produce a servo pattern is encoded in a series of soft output samples corresponding bits;

[0019] 通过在各块位置上计算表示各采样和同步字的相应的位之间的相关性的位相关值并将各位相关值相加并减去相应的采样值的预定函数,来产生软输出采样系列中的滑动L采样块的各位置的块相关值;和 [0019] The position of each block calculated using the correlation between corresponding bits of each sample and the sync word correlation between the value and the correlation value to you and subtracting the corresponding sample values of a predetermined function to produce soft output sample series L sample block sliding block correlation values for each position; and

[0020] 检测在软输出采样系列的(N+L-1)采样序列中具有最大块相关值的块位置上的 [0020] detection has (N + L-1) sample sequence soft output sample series of block position of the maximum block correlation value on

同步字。 Synchronization word.

[0021] 一般地,在这里参照本发明的一个方面的实施例描述特征的情况下,可以在本发明的另一方面的实施例中提供相应的特征。 [0021] In general, in the case of the embodiment described herein with reference to an aspect of the present invention described features, in another aspect of the present invention embodiments provide corresponding features.

附图说明 Brief Description

[0022] 现在参照附图作为例子描述本发明的优选实施例,其中: [0022] Referring now to the accompanying drawings as an example of description of the preferred embodiment of the present invention, wherein:

[0023] 图1显示在常规的LTO带驱动器中使用的硬判决同步字检测器; [0023] FIG. 1 shows the use of the conventional LTO tape drive in the hard decision sync word detector;

[0024] 图2是可使用使用本发明的字同步系统的带驱动器的示意图; [0024] FIG. 2 is a schematic diagram using the word synchronous belt drive system of the present invention may be used;

[0025] 图3示出形成其中可将LPOS信息编码的伺服帧的伺服脉冲串的LTO规则; [0025] Figure 3 illustrates the formation of servo information which can be encoded LPOS LTO servo frame burst rules;

[0026] 图4表示如何在LTO伺服帧中将LPOS位编码;[0027] 图5是图2的带驱动器中的字同步化装置的示意性框图; [0026] FIG. 4 shows how the servo frame in the LPOS bit code in LTO; [0027] FIG. 5 is a belt drive 2 word synchronization schematic block diagram of the device;

[0028] 图6表示图5装置的软输出检测器的一个实施例; An embodiment of [0028] the soft output detector Figure 5 shows the apparatus of FIG. 6 embodiment;

[0029] 图7表示图5装置的软输出检测器的另一实施例; [0029] Another soft output detector of FIG. 5 FIG. 7 shows an embodiment of the device;

[0030] 图8表示图5装置的同步字检测器的一个实施例; An embodiment [0030] The sync word detector 8 shows apparatus according to FIG. 5;

[0031] 图9表示图5装置的同步字检测器的另一实施例;以及 [0031] Another synchronization word detector in FIG. 9 shows an embodiment of the apparatus of FIG. 5; and

[0032] 图10和图11是比较常规的字同步系统和本发明的优选实施例的模拟结果的图。 [0032] FIG. 10 and FIG. 11 is a preferred embodiment of the simulation results more conventional word synchronization system and the implementation of the present invention.

具体实施方式 DETAILED DESCRIPTION

[0033] 图2是示出与使用本发明的字同步化系统相关的关键元件的带驱动器的简化示意图。 [0033] FIG. 2 is a simplified schematic view of the tape drive and use the key element of the present invention is related to the word synchronization system. 带驱动器1具有用于在磁带3上读取和写入数据的读取/写入头2。 1 tape drive has a read for reading and writing data on the tape 3 / write head 2. 特别地,头2具有用于在带3由带传输机构(未示出)传送经过头2时在各数据轨道4中读取和写入数据的多个读取/写入元件(未示出)。 In particular, the head 2 has a belt 3 by a belt transmission mechanism (not shown) is transported past the read head 2 and a plurality of read-write data in each data track 4 / write element (not shown ). 在头2上安装用于读取在与数据轨道相邻的专用伺服带段6中记录的伺服图案的伺服读取器5。 Mounted on the head 2 for reading data in the dedicated servo tracks adjacent to the recording tape segment 6 in the servo pattern of the servo reader 5. 在操作中,伺服读取器5将伺服图案读取信号r输出到伺服控制器8。 In operation, the servo controller 5 reads the servo pattern read signal to the servo controller 8 outputs r. (实际上,可以在读取各伺服带段6并向伺服控制器8提供读取信号的头2上设置多于一个的伺服读取器。在提供伺服控制功能时,这提供更高的健壮性(如果伺服读取器中的一个的输出不可靠,那么能够切换到另一个的输出),但是,通过考虑示出的单一伺服读取信号r,可以理解伺服控制器8的操作)。 (In fact, it is possible to read each servo band portion 6 to the servo controller 8 to provide more than one set of servo read head 2 on the read signal. In providing servo control function, which provides greater robustness (and, if the output of the servo reader an unreliable, then the output can be switched to another), but consideration shown by a single servo read signal r, can understand the operation of the servo controller. 8). 伺服控制器8处理读取的信号r以导出用于控制带3和头2的相对移动的各种信息。 Servo controller 8 reads the signal r process to derive information for controlling various band 3 and the relative movement of the head 2. 特别地,产生供带传输控制系统使用的带速度ν的估计。 In particular, produce an estimate for banding speed transmission control system using the ν's. 从读取信号中的脉冲的相对定时估计头2的横向位置,并且,位置误差信号(PES)被输出到位置控制机构9。 From the estimated lateral position relative timing of pulses in the read signal of the head 2, and the position error signal (PES) is output to the position control mechanism 9. 这控制由图中的虚线表示的头的横向位置。 This controls the lateral position of the head by a dotted line in the figure. 另外,通过伺服控制器8提取在伺服图案中编码的纵向位置(LPOS) 信息,以确定头2沿着带的绝对位置。 Further, the servo pattern in the servo controller 8 extracts encoded longitudinal position (LPOS) information to determine the absolute position of the head 2 along the tape. 如现在参照图3和图4解释的那样,根据LTO伺服图案规范记录LPOS信息。 Referring now to FIG. 3 as explained in Figure 4 and, according to LTO servo information recording LPOS pattern specification.

[0034] 图3示出与LTO伺服图案的一个200- μ m周期对应的LTO伺服帧。 [0034] Figure 3 illustrates LTO servo frame 200- μ m with a period corresponding to the LTO servo pattern. LTO伺服帧包含标为A、B、C和D的四个伺服脉冲串。 LTO servo frame contains four servo bursts labeled A, B, C and D. A和B脉冲串具有5个伺服条带,而C 和D脉冲串具有4个伺服条带。 A and B bursts having five servo bands, while C and D burst has four servo bands. 伺服条带包含分开2.1 μ m并且以士π /30弧度(6度) 的方位角书写的两个磁化转变。 Servo strip comprising 2.1 μ m apart and with disabilities π / 30 radians (6 degrees) Azimuth written two magnetization changes. 伺服脉冲串内的伺服条带彼此相隔5μιη的距离。 Servo burst within the servo bands spaced apart 5μιη distance. 为了将伺服帧内的LPOS信息的一个位编码,伺服帧的A和B脉冲串内的第二和第四伺服条带的位置被调制。 In order to position the second and fourth one-bit encoded servo strips servo frame LPOS information, A and B servo burst frames within the band is modulated. 伺服条带位置的偏移为士0.25 μ m。 Offset position servo band of 0.25 μ m. 图4表示由包含A和B脉冲串的子帧1和包含C和D脉冲串的子帧2构成的LTO伺服帧内的一个LPOS位的编码。 Figure 4 shows an encoded LPOS bit 2 LTO servo frame formed by the sub-frame contains A and B and a sub-burst comprising C and D burst frames. 通过从A和B脉冲串中的每一个中的中心条带向外偏移第二和第四伺服条带,该图的上部显示“1”的编码。 Offset outwardly by the second and fourth bands from the servo bursts A and B in each of the center strip, the upper part of the figure shows "1" is coded. 通过向A和B脉冲串中的中心条带向内偏移第二和第四伺服条带,该图的下部显示“O”的编码。 By the A and B bursts center strip offset inwardly of the second and fourth servo bands, the lower part of the figure show "O" in the code. 这些伺服帧的回读信号由此是代表两个LPOS位值的PPM 编码信号S1 (t)和S0 (t)。 These servo readback signal frames thus represent two PPM-encoded LPOS bit signal values S1 (t) and S0 (t).

[0035] 在LTO中,在包含与7.2mm的带长度对应的36个伺服帧的LPOS字中包含LPOS [0035] In the LTO, the included LPOS containing the band corresponding to the length of 7.2mm 36 servo frames LPOS word

信息。 Information. 各36位LPOS字从固定的8位同步字开始,之后是24位的LPOS信息和4位的制造符号。 Each 36 LPOS word from a fixed 8-bit sync word starts, followed by 24 of LPOS information and producing four symbols. LPOS信息规定带上的绝对纵向地址。 LPOS information specifies the absolute tape longitudinal address. 固定的8位同步字图案是10000000,其中,符号“1”被首先写入。 A fixed 8-bit sync word pattern is 10000000, where the symbol "1" is written first. 因此,LTO伺服带段中的同步字被周期性嵌入LPOS数据流中,对于与36位LPOS字的带长对应的每7.2mm重复8位同步字。 Therefore, LTO servo band segments LPOS sync word is periodically embedded in the data stream, and 36 for the tape length LPOS word corresponding to each repeated eight 7.2mm sync word. 两个连续的LPOS字的LPOS值相差1。 LPOS values of two consecutive LPOS words differ by one. 因此,LTO带驱动器1可以以7.2mm的纵向分辨率将读取/写入头2放置到带3下一给定LPOS。 Therefore, LTO tape drive 1 to 7.2mm of vertical resolution can be read / write head 2 is placed next to the band 3 given LPOS. 但是,要这样做,必须首先由伺服控制器8从伺服图案读取信号提取LPOS信息。 However, to do this, you must first extract the information from the servo controller 8 LPOS read signal from the servo pattern. 这需要字同步化以检测PPM编码读取信号r中的8位LPOS 同步字。 This requires word synchronization code reader to detect the PPM signal r of 8 LPOS sync word. 伺服控制器8由此包含用于同步字检测的字同步化装置,以下描述其优选的实施例。 Whereby the servo controller 8 comprises word synchronizing means for detecting the sync word, the following description of preferred embodiments thereof. 这些实施例基于PPM编码LPOS位的软输出检测执行字同步化。 These examples are synchronized PPM encoded LPOS bit Word-based soft-output detection. 在详细描述优选的实施例之前,考虑优选的实施例基于的以下理论分析是有用的。 Prior to a detailed description of the preferred embodiments, consider the following preferred embodiment is based on theoretical analysis is useful.

[0036] 首先描述存在加性高斯白噪声(AWGN)的情况下的二元调制信号的软输出(软判决)的产生过程。 [0036] described first soft output binary modulation signal the presence of additive white Gaussian noise (AWGN) under the (soft decision) production process. 考虑分别代表LPOS位值O和1的两个信号S1 (t)和8(0,这两个信号的脉冲位置根据LPOS位值如上面描述的那样被调制。假定两个信号对于等于间隔(O, Τ)中的至多等于T秒的时间间隔为非零并且具有相同的能量: Consider LPOS bit values representing O, and the two signals S1 1 (t) and 8 (0, as a pulse modulated signal based on the position of these two LPOS bit values as described above is assumed equal to the interval of two signals ( O, at most equal to Τ) in the T-second interval to zero and have the same energy:

[0037] Es = |οΓ[ί(/)]2Λ = Jor[sJ(012i/r. [0037] Es = | οΓ [ί (/)] 2Λ = Jor [sJ (012i / r.

[0038] LPOS符号流可由下式表示: [0038] LPOS symbol stream represented by the following formula:

[0039] q(t)= YiIakS1 (t - fcr+Γ)+(1 -ak)s (t-kT-l Γ)] [0039] q (t) = YiIakS1 (t - fcr + Γ) + (1 -ak) s (t-kT-l Γ)]

^ζ !S!…1111ϊ>0 ^ Ζ! S! ... 1111ϊ> 0

[0040] 其中,ak是独立且均等分布的取值O或1的二元数据位的流。 [0040] wherein, ak are independent and equally distributed value O or 1 bit binary data stream. 以下,双极LPOS 符号由bk = 2ak-l表示,并且,使用加性高斯噪声模型以通过下式表征再生的信号: Hereinafter, bipolar LPOS symbol = 2ak-l is represented by bk, and, using the additive Gaussian noise model characterizing signal reproduced by the following formula:

[0041] r(t)=q(t)+n ⑴ [0041] r (t) = q (t) + n ⑴

[0042] 其中,添加的噪声过程n(t)的一侧谱密度是平的并且由Ntl给出。 [0042] wherein, the added noise process n (t) is the spectral density of the flat side and is given by the Ntl.

[0043] 用于接收的二元调制信号的检测器被假定为由脉冲响应g(t)表征的线性滤波器,O^t^T,其后是每T秒提供采样的采样器。 [0043] Dual detector for receiving the modulated signal is assumed by the impulse response g (t) characterizing the linear filter, O ^ t ^ T, followed provide samples every T seconds sampler. 这种类型的检测器将被称为1型检测器。 This type of detector is called a type detector.

1型检测器的软输出,即t = kT上的采样值,可由下式表达: 1 soft output detector, ie t = kT on samples, can be expressed by the equation:

[0044] Xt : x(kT) = J^(r)r(/:7 - τ)άτ =【g(r)g(kT-τ)άτ+^ g{T)n{kT-τ)άτ [0044] Xt: x (kT) = J ^ (r) r (/: 7 - τ) άτ = [g (r) g (kT-τ) άτ + ^ g {T) n {kT-τ) άτ

[0045]其中, [0045] where

[0046] x^ = f08^)r(fr)dT = lrg(tT)r(T)dr [0046] x ^ = f08 ^) r (fr) dT = lrg (tT) r (T) dr

P P

[0047] 由于n(t)是高斯过程,因此Xk是高斯随机变量。 [0047] Since n (t) is a Gaussian process, and therefore a Gaussian random variable Xk. 以下,<表示在位间隔中记录S(t)时的采样值,并且,<表示在位间隔中记录S1 ω时的采样值。 The following, <represents the value of the bit sampling interval recording S (t) time, and, <represents the time of sample values S1 ω reign interval recording. 采样4和<的均值由下式给出: Sample 4 and <mean is given by the following equation:

[0048] m0 = E[JC] =f% (T)S0 (Γ - τ)άτ [0048] m0 = E [JC ] = f% (T) S0 (Γ - τ) άτ

[0049] ml =Ε[λ|]= Tg(^)J1 (Γ- [0049] ml = Ε [λ |] = Tg (^) J1 (Γ-

[0050] 其中,E是期望算子。 [0050] where, E is the expectation operator. 检测器滤波器的输出上的采样Xk的标准偏差不依赖于记录什么信号的,并由下式给出:[0052] 其中,G(f)是g(t)的傅立叶变形,并且,使用Parseval定理以表示作为脉冲响应g(t)的函数的标准偏差σ。 The standard deviation of the sample Xk output filter on the detector is not dependent on what signals recorded by the following formula: [0052] where, G (f) is g (t) Fourier deformation, and using Parseval Theorem to as σ represents the impulse response g (t) as a function of the standard deviation.

[0053] 假定各位ak是同等似然的,并且In1 > ην最大似然性检测器的判决规则(如在上面提到的“ Principles of Communication Engineering ” 中讨论的那样)为: [0053] ak assume everybody is equal likelihood and In1> ην maximum likelihood decision rule detector (as in the above-mentioned "Principles of Communication Engineering" as discussed) is:

[0054] [0054]

Figure CN102027538AD00101
Figure CN102027538AD00102

[0056] 其中,屯是由记录位的最大似然性估计获得的检测器输出上的硬判决。 [0056] where, Tuen hard decision detector output from the recording bits obtain maximum likelihood estimation on. 执行阈值试验以确定记录位的值的最大似然性检测器使检测的位的平均误差率最小化。 Executive threshold test to determine the value of the maximum recording bit like the average error rate position detection allows the detection probability is minimized. 事实上,最大似然性检测器的输出上的平均位误差率Pb为: In fact, the average bit error rate maximum likelihood detector on the output Pb is:

[0058]其中, [0058] wherein,

[0059] [0059]

Figure CN102027538AD00103

[0060] 如果参数μ-ιηΐΛ σ被最大化,那么最大似然性检测器的输出上的平均位误差率Pb被最小化。 [0060] If the parameter μ-ιηΐΛ σ is maximized, the average bit error rate maximum likelihood detector on the output Pb is minimized. 如果下式成立,则使用Schwartz不等式,Imtl-In1I/^ σ被最大化: If the following equation is established, use the Schwartz inequality, Imtl-In1I / ^ σ is maximized:

[0061] [0061]

Figure CN102027538AD00104

[0062] 其中,c是任意的常数。 [0062] wherein, c is an arbitrary constant.

[0063] 以下,假定C = 炉),其中, [0063] Hereinafter, assuming C = furnaces), wherein,

[0064] [0064]

Figure CN102027538AD00105

[0065] 在这种情况下, [0065] In this case,

[0066] [0066]

Figure CN102027538AD00106

[0067] 和 [0067] and

[0068] [0068]

Figure CN102027538AD00107

[0069] 从而,不存在噪声的情况下的来自检测器的软输出可被表达为〜=五[;^队]=氏V尽(1-炉)/2。 [0069] Thus, the soft output from the detector noise does not exist under the circumstances can be expressed as ~ = five [; ^ Team] = 's V do (1 furnace) / 2. 并且,检测阈值为零,艮P,(m+m1)/2 = 0,并且,最大似然性检测器的输出上的平均LPOS位误差率Pb变为: In addition, the detection threshold of zero, Burgundy P, (m + m1) / 2 = 0, and the maximum average LPOS bit error rate like on the output of the detector and then Pb becomes:

[0070] [0070]

Figure CN102027538AD00111

[0071] 接收的二元调制信号的替代性的2型检测器的软输出由下式表征: [0071] 2 soft output detector type alternative received binary modulated signals characterized by the formula:

Figure CN102027538AD00112
Figure CN102027538AD00113

[ [

Figure CN102027538AD00114

[0075] 可以很容易地看出,1型和2型检测器具有相同的软输出,S卩,对于所有的k,1 型软输出Xk与2型软输出Λ相同。 [0075] can be easily seen that type 1 and type 2 have the same soft detector output, S Jie, for all k, type 1 and type 2 soft output Xk Λ same soft output.

[0076] 以上的分析考虑存在加性高斯白噪声的情况下的二元调制信号的软输出检测。 Detecting the presence of soft output binary modulation signal additive white gaussian noise in the case of the above [0076] The analysis considered. 以下描述使用产生的软输出的最佳软判决LPOS字同步化。 The following description uses the best produce soft output soft-decision LPOS word synchronization.

[0077] 考虑从在前面的部分中描述的检测器获得的N个软输出 [0077] consideration received from the detector described in the previous section of N soft output

Figure CN102027538AD00115

块。 Block. 从以前的部分中的分析,软输出可被表示为信号项和噪声项的和,即, From the previous part of the analysis, the soft output can be represented as a signal and noise terms and items, namely,

Figure CN102027538AD00116

其中,在数据图案上,mk=bjEJ}-(p)n,或者,在同步图案上,ηι,=ρ^Ε,(1-φ)/2, Wherein the data pattern, mk = bjEJ} - (p) n, or, in the sync pattern, ηι, = ρ ^ Ε, (1-φ) / 2,

其中,pk是假定值+1或-1的双极同步符号,nk是具有标准偏差σ = V^TI的独立高斯噪声采样。 Where, pk is the assumed value of bipolar symbols +1 or -1 synchronization, nk is a standard deviation σ = V ^ TI independent Gaussian noise samples. 检测的软输出块与L个同步字位和(NL)个随机二元数据位对应。 The soft-output corresponding to the detected block sync word bits and L (NL) random binary data bits. 在上述的LTO中,N = 36并且L = 8,并且,对于i = l、…、7,LPOS同步字由pQ = 1和Pl ="I定义。并且,LPOS字中的28位二元数据序列包含七个14进制(14-ary)符号,其中,通过使用规定的一对一映射,每个14进制符号被编码成四个位。其中,LPOS数据位的序列被模型化为具有相等概率的独立且均等分布的二元数的序列。由于14相LPOS 符号初始是未知的,这种假定允许导出简单最佳LPOS字同步化算法并被验证。 In the above-described LTO, N = 36 and L = 8, and, for i = l, ..., 7, LPOS sync word = 1 and Pl = "I is defined by the pQ. And, LPOS word 28 binary data sequence contains seven 14-ary (14-ary) symbols, wherein, by using a predetermined one mapping, each 14-ary symbols are encoded into four bits which, LPOS data bit sequence is modeled as having independent and equal distribution of the sequence of binary numbers equal probability. Since 14 of LPOS symbol is initially unknown, this assumption allows exporting Simply The Best LPOS word synchronization algorithm was validated.

[0078] 基于在上述又基于混合Bayes规则的JLMassey文献中描述的方法,得到最佳LPOS字同步化算法,该算法使正确地定位LPOS同步字的可能性最大化,其中LPOS同步字被周期性嵌入伺服信道中的LPOS数据流中。 [0078] The method of mixing the above and based on Bayes rule JLMassey described in the literature, based on the best LPOS word synchronization algorithm, which maximizes the possibility of correctly positioned LPOS sync word, which is periodically LPOS sync word embedded servo channel LPOS data stream. 对于长度为N+L-1 = 43采样的软输出(xk、xk+1、…、xk+42)的检测块,估计最佳LPOS同步字位置的算法选择LPOS同步字位置1为使以下的统计最大化的值n,0<n<36, For a length N + L-1 = 43 samples soft output (xk, xk + 1, ..., xk + 42) of the detection block, the best LPOS sync word estimation algorithm to select the location LPOS sync word location so that less than 1 Statistical maximize the value n, 0 <n <36,

7 7 77

[0079] Σ Pi ^^ "Σ^+Ηη) ί0 ί0 [0079] Σ Pi ^^ "Σ ^ + Ηη) ί 0 ί 0

[0080]其中,Kx) f nJcos^ . SNR / ,1] [0080] wherein, Kx) f nJcos ^. SNR /, 1]

SNR [ Wd-灼/2 JJ SNR [Wd- burning / 2 JJ

[0081] 并且,信号噪声比SNR由下式给出: [0081] In addition, signal to noise ratio (SNR) is given by:

11[0082] 11 [0082]

Figure CN102027538AD00121

[0083] 由于作为与很好地限定的统计的最大化结合的滑动块操作的结果而选择了最佳LPOS同步字位置1,因此以上的字同步化算法是滑动块类型。 [0083] As a result of well-defined as to maximize the statistical combination of slider operations and selected the best LPOS sync word position 1, so the above word synchronization algorithm is a sliding block type. 该统计可被描述为软相关项和代表其中周期性嵌入8位LPOS同步字的随机数据的影响的第二项的和。 The statistics can be described as soft and representatives related items which cyclical embedded 8 LPOS sync word of random data, and the second term. 注意,该统计依赖于伺服信道中的LPOS检测的SNR。 Note that the statistics rely on servo channel LPOS detection SNR. 但是,对于大的SNR,函数h(x)可由不依赖于SNR的|x|近似。 However, for large SNR, the function h (x) does not depend on the SNR by | x | approximation. 该近似允许更简单地实现用于选择最佳LPOS同步字的统计。 This approximation allows more easily realized for selecting the best LPOS sync word statistics. 确定最佳LPOS同步字位置的规则在这种情况下简化以使以下的统计最大化: [0084] Determining the best LPOS sync word location simplifies the rules in this case to make the following statistical maximized: [0084]

Figure CN102027538AD00122

[0085] 其中,最后的求和是在索引的集合N=丨i|07和Plxk+1+n<0丨上进行的。 [0085] where the last summation in the index set N = Shu i | on 0 7 and Plxk + 1 + n <0 丨 conducted. 换句话说,用于确定最佳LPOS同步字位置的规则简化以使负相关的项的和最小化,艮口, In other words, the rules for determining the best LPOS sync word location simplifies the items related to the negative and minimized Gen mouth,

[0086] [0086]

Figure CN102027538AD00123

[0087] 在到目前为止讨论的最佳软判决LPOS字同步算法的导出中,假定信号s(t)和S1W在时间间隔(0,T)中的至多T秒内为非零。 [0087] In the Export optimum soft-decision LPOS word synchronization algorithm discussed so far, it is assumed signal s (t) and S1W time interval (0, T) within the non-zero at most T seconds. 在纵向记录中,这些信号可被模型化为几个窄的脉冲的重叠。 In longitudinal recording, these signals can be modeled as a few narrow pulses overlap. 特别地,在LPOS检测的情况下,对于四个位置调制伺服条带的响应导致八个脉冲的重叠以产生信号s(t)和sHt)。 Particularly, in the case of detection of LPOS, position modulated servo response for the four bands resulted in eight overlapping pulses to generate a signal s (t) and sHt). 在以下的方法中,信号s(t)和S1G) 的支持从(0,T)扩展到整个实线。 In the following process, the signal s (t) and S1G) support from (0, T) extend to the whole solid line. (在数学上支持函数f(.)的是该函数不为零的点的集合)。 (Support function f in mathematics (.) Is the set of the function is not zero point). 很显然,如果信号3(0和S1⑴的大多数能量位于间隔(0,T)中,那么到目前为止讨论的LPOS字同步化算法很好地执行,艮口, Obviously, if the signal 3 (most energy 0 and S1⑴ located interval (0, T), then LPOS word synchronization algorithms discussed so far performed well, Gen mouth,

[0088] [0088]

Figure CN102027538AD00124

[0089] 在LTO中,由于最小转变距离仅为与时间间隔T对应的2.1 μ m,其远小于带上的200 μ m的LTO伺服帧长度,因此以上的假定被验证。 [0089] In the LTO, since only the minimum transition distance and time interval T corresponding to 2.1 μ m, which is much less than the LTO servo frame length of 200 μ m band, so the above assumptions are verified.

[0090] 在特别有利的方法中,被最小化的统计中的卷积积分由和近似,并且,该和中 [0090] In a particularly advantageous method, is minimized by the statistics of the convolution integral and approximate, and the and the

的不重要项被舍弃t 这种情况下,统计 The important items are discarded t In this case, statistics

这允许用数字逻辑特别简单和健壮地实现LPOS字同步化算法。 This allows a particularly simple and robust digital logic to achieve LPOS word synchronization algorithm. In

[0091] [0091]

Figure CN102027538AD00125

[0092] 可由统计 [0092] by statistics

[0093] [0093]

Figure CN102027538AD00126

[0094]近似为乘法常数,其中,j是索引的集合,并且, J; =S0U = JT'-(k + i + n- 1)Γ), [0094] approximately multiplicative constant, where, j is a collection of indexes, and, J; = S0U = JT '- (k + i + n- 1) Γ),

[0095] [0095]

Figure CN102027538AD00127

[0098] 对于带速度V,调制信号釆样P、W和接收的釆样?:相互的间隔比τ = 200μπι/ Bian sample [0098] For the belt speed V, the modulation signal Bian sample P, W and received:? Reciprocal space ratio τ = 200μπι /

ν更接近,即,Τ<<Τ。 ν closer, that is, Τ << Τ. 例如,由于速率1/Τ比伺服信号的两侧带宽大,因此,T = 0.25 μ m/v的间隔对于LTO伺服信号是好的选择,从而保证如采样理论所要求的、可在不损失信息的情况下从其采样巧重建接收的信号。 For example, since the rate of 1 / Τ side is larger than the bandwidth of the servo signal, and therefore, T = 0.25 μ m / v LTO servo signal for an interval is a good choice, as to ensure the required sampling theory, can be made without loss of information The case from the sampling clever reconstruction of the received signal. 在认识到只有近似统计中的少数几个项对于和有显著贡献的进一步的简化中,可通过在索引的子集fe/上取和,从而有效地计算统计,即,被最小化的统计变为: Recognizing that only approximately a few key stats and a significant contribution to the further simplification can be indexed by a subset of fe / on the take and to effectively calculate statistics, namely, to be minimized statistical change as follows:

Figure CN102027538AD00131

[0100] 在前面定义的2型检测器的情况下,被最小化的统计为 [0100] In the case of type 2 detector defined above, it is minimized counted as

[0101] [0101]

Figure CN102027538AD00132

[0102] 还在这种情况下,为了获得软判决LPOS字同步化算法的有效和健壮的实现,可以有利地通过和近似统计中的积分,并且可以舍弃该和中的不重要项。 [0102] In this case also, in order to obtain soft-decision LPOS word synchronization algorithm is effective and robust implementation, may advantageously be approximated by statistics and integration, and can discard it and the unimportant items. 得到的被最小化的统计从而由下式给出: The resulting statistics is minimized thus given by:

[0103] [0103]

Figure CN102027538AD00133

[0104] 现在参照图5-图9描述基于前面的分析的字同步化装置的优选实施例。 [0104] Referring now to Figures 5 to 9 described embodiment is based on previous analysis of word synchronization apparatus preferably. 图5的框图示出供图2带驱动器中的伺服控制器8使用的字同步装置10的一般形式。 5 shows a block diagram in Figure 2 with the word for the drive servo controller 8 uses the synchronization means 10 of the general form. 装置10 包含软输出检测器11和同步字检测器12。 Means 10 comprises a soft output detector 11 and the sync word detector 12. 软输出检测器11包含信号采样产生器13和软输出产生器14。 Soft output detector 11 includes a signal generator 13 and the sampling soft output generator 14. 简言之,信号采样产生器13从伺服读取器5 (图2)接收连续时间读取信号r,并且产生与各编码LPOS位周期T对应的一组内插信号采样?=;。 Briefly, the signal generator 13 receives the successive sampling time read from the servo reader 5 (FIG. 2) signal r, and generates encoded LPOS bit period with a corresponding set of interpolated T sampling signal? = ;. 软输出产生器14处理内插采样巧以产生与编码LPOS位对应的软输出采样uk。 14 Treatment of Soft output generator to generate interpolated samples clever coding LPOS bit soft output samples corresponding to uk. 一系列的软输出采样...U1 A series of soft output samples ... U1

Figure CN102027538AD00134

uk, uk+1、...被供给到如后面详细描述的那样操作的同步字检测器12以检测采样流中的同步字,从而当检测到同步字时输出帧同步指示符信号。 uk, uk + 1, ... are supplied to the sync word detector as hereinafter described in greater detail the operation of 12 to detect the sample stream sync word, so that when the output frame sync word is detected synchronization indicator signal.

[0105] 在图6中更详细地示出用作图5中的检测器11的软输出检测器的优选实施例。 [0105] is shown in Figure 6 in more detail in Figure 5 is used as a soft output detector detector 11 of the preferred embodiment. 本实施例的软输出检测器Ila包含信号采样产生器13和在图中详细示出其结构的软输出产生器14a。 Ila soft output detector of the present embodiment comprises a signal sample generator 13 and a soft output generator shown in detail in FIG its structure 14a. 信号采样产生器13包含采样器(A/D)15、脉冲串内插器16和定时基础产生电路17。 Signal sample generator 13 comprises a sampler (A / D) 15, a burst interpolator 16 and a timing generating circuit 17 based. 在操作中,采样器15以固定的采样频率对读取信号r进行采样,并且,得到的采样被供给到脉冲串内插器16。 In operation, sampler 15 at a fixed sampling frequency of the read signal r is sampled, and the resulting samples are supplied to the burst interpolator 16. 脉冲串内插器操作以在伺服图案读取信号中内插伺服帧脉冲串的固定频率采样以产生与由定时基础电路17确定的定时对应的信号采样?;+。 Burst interpolator operative to read the servo pattern in the servo signal frame is inserted in a burst of fixed sampling frequency to generate a timing signal corresponding to the sampling circuit 17 is determined by the timing of the foundation;? +. Indeed

定这些定时,使得对于带的单位长度以固定的速率产生采样?=;。 These timing set so that the unit length of the belt at a fixed rate to produce samples? = ;. 可如在我们的美国专利No.7,245,450和前面给出的Cherabini等人的文献中详细描述的那样实现脉冲串内插器16 和定时基础电路17。 It can be realized as a burst interpolator 16 and the timing and other basic circuit Cherabini in our United States Patent No.7,245,450 and people given earlier literature described in detail 17. 关键点是,在与带速度无关的预定的固定速率上获得采样巧,鉴于单位带长度的采样而规定该速率。 The key point is that in the tape speed independent of the sample obtained by a predetermined fixed rate Qiao, in view of the length of the sampling unit with the provisions of that rate. 内插器输出上的伺服信道信号的分辨率由此由作为内插器输出上的采样之间的最小距离的阶梯内插距离ΔΧ确定。 Resolution servo channel signal on the output of the interpolator thus as the minimum distance from the sampling interpolator output between the inner stepped interpolation distance ΔΧ OK. 可在斜坡上升、斜坡下降中以及对于直至最大速度Vmax的任何恒定带速度实现可靠的LPOS检测。 In ramp-up, ramp-down as well as for any constant belt speed up to the maximum speed Vmax of reliable LPOS detection. 假定采样器15的输入上的PPM伺服信号的一侧带宽为非调制伺服信号的谱带的主瓣的宽度的两倍,艮口, W = 2vmax/Lp,其中,Lp是磁化的转变之间的最小距离,采样定理提供采样器15的采样速率(上的近似下界为: 4v Twice the width of the main lobe of the side band assumed non-modulated servo signal bandwidth of the servo PPM signal input on the sampler 15, the Burgundy mouth, W = 2vmax / Lp, where, Lp between the magnetization change The minimum distance, provided the sampling theorem sampler sampling rate of approximately 15 lower bound (as on: 4v

Figure CN102027538AD00141

[0107] 采样速率(的这种选择使得混叠效应(aliasing effect)可忽略不计。因此,脉冲串内插器16的输出上的阶梯内插距离ΔΧ上的近似上界为Ax^Lp/4。例如,对于在LTO 中规定的Lp = 2.1 μ m,阶梯内插距离由Δχ《0.525μιη界定。 [0107] sampling rate (this choice makes the aliasing effects (aliasing effect) is negligible. Therefore, the step in the output burst interpolator 16 on the plug on the approximate distances ΔΧ bound to Ax ^ Lp / 4 For example, for the LTO prescribed Lp = 2.1 μ m, the step interpolation distance from the Δχ "0.525μιη defined.

[0108] 得到的一组内插信号采样? [0108] a group of interpolated signal samples obtained? ;被供给到软输出产生器14a。 ; Is supplied to the soft output generator 14a. 它包含如图所示的那样连接的乘法器18a、18b和求和电路19a、19b和20。 It comprises a multiplier connected as shown in Fig. 18a, 18b, summing circuits 19a, 19b and 20. 在操作中,内插采样巧被供给到两个乘法器18a、18b的第一输入。 In operation, the coincidence is supplied to the interpolated samples of the first two multiplier inputs 18a, 18b of. 乘法器18a、18b的其它输入分别接收代表在伺服图案中编码的位值O和1的PPM编码信号s (t)和S1 (t)的采样g和g。 Multipliers 18a, 18b, respectively, the other input receiving a signal representative of the servo pattern and the encoded bit PPM encoded signal value O s (t) and S1 (t) and g 1 g of the sample. 在与相应的内插采样? In the corresponding interpolated sample? ;的那些对应的采样定时上取一组采样?,。 ; Those that take on a set of corresponding sampling timing sampling,?. 和? And? ;,并且,可事先对于已知的基准信号s。 ; And, it may advance to a known reference signal s. (t)和S1W 产生它们。 (T) and S1W produce them. 随着采样巧通过乘法器18a、18b被计时,乘法输出被供给到各求和电路19a、 19b。 With clever sampling by the multiplier 18a, 18b are timed, multiplication output is supplied to each of the summing circuit 19a, 19b. 它们将索引的集合J上的输入求和,je J。 They will enter the summation on the index set J, je J. 在每J个输入之后,复位信号将来自电路19a、19b的当前和值计时到求和电路20,并将和值复位为零。 J after each input, a reset signal from the circuit 19a, 19b of the timing of current and value to a summing circuit 20, and the value will be reset to zero. 电路20从求和电路19b的输出减去求和电路19a的输出,以产生当前软输出采样yk。 Summing circuit 20 subtracts the output of the output circuit 19a and 19b from the summing circuit to produce a soft output current sampling yk.

[0109] 可以看出,本实施例的软输出产生器14a处理信号以产生以下形式的软输出采样yk: [0109] As can be seen, the soft output generator 14a of the present embodiment is processed to produce a signal in the form of soft output samples yk:

[0110] [0110]

Figure CN102027538AD00142

[0111] 其中,比例常数在这种情况下是统一的。 [0111] wherein, in this case the proportionality constant is unity. 在实施例的进一步的简化中,如前面给出的分析讨论的那样,可以仅在最重要项上,即在索引集合J的子集J'上取电路19a 和19b中的和。 In a further simplified embodiment, the analysis given above as discussed above, may be the most important item, namely the collection in the index only a subset of J J 'extraction circuits 19a and 19b and on. 例如,对于由|J| = 2000 = 200ym/100nm给出的集合J的尺寸的典型值,其中,假定ΔΧ =IOOnm的阶梯内插距离和200 μ m的伺服帧长度,那么可仅在|J' | =16项的子集J'上取得和。 For example, for the | J | = 2000 = 200ym / 100nm size of a given set of typical values of J, which assumed ΔΧ = IOOnm stepped interpolation distance and 200 μ m servo frame length, it can only | J '| = a subset of 16 of the J' made and on. 这是由于,每个双位响应(与伺服条带对应的回读伺服信号)可由4个采样(双位响应中的正脉冲的2个采样,双位响应中的负脉冲的2个采样) 表示,因此,只能使用和中的16个项以表征其在伺服帧内的位置被调制的四个双位(与每个伺服帧的4个PPM调制伺服条带对应的回读伺服信号)(参见图4)。 This is because, each dibit response (band corresponding to the servo readback servo signal) by 4 samples (2 samples dibit response to the positive pulse, two samples dibit response to the negative pulses) representation, therefore, only 16 items in use and to characterize their position servo frame are modulated by four double-bit (with 4 PPM modulation servo strips each servo frame with the corresponding readback servo signal) (see Fig. 4). 因此,可以看出,检测器14a的软输出Uk按缩放比例因子近似在前面的分析中讨论的1型软输出xk。 Therefore, it can be seen, the soft output Uk detector 14a by a scaling factor is approximately 1 soft output xk discussed in the previous analysis.

[0112] 在图7中示出用于图5装置中的软输出检测器的替代性优选实施例。 [0112] In Figure 7, Figure 5 shows a device in the soft output detector alternative preferred embodiments. 本实施例的软输出检测器lib包含以上对于图6描述的信号采样产生器13和替代性软输出产生器14b。 Lib soft output detector of the present embodiment comprises a signal sample above for FIG. 6 described generator 13 and alternative soft output generator 14b. 软输出产生器14b包含与产生器14a类似的部件,并且,这里只讨论关键的不同。 Soft output generator 14b comprises a generator like member 14a, and, where only the key differences discussed. 特别地,在产生器14b中,乘法器18a、18b由后面跟随有所示的平方电路23a、23b的加法器22a、22b替代。 In particular, the generator 14b, a multiplier 18a, 18b is followed by a squaring circuit shown in 23a, 23b of the adders 22a, 22b instead. 对于各内插输入采样?;,平方电路23a的输出为(巧-巧)2。 For each interpolated input sample; and output of squaring circuit 23a (clever - clever) 2?. 类似地, Similarly,

平方电路23b的输出为 The output of squaring circuit 23b is

Figure CN102027538AD00151

. 通过求和电路24a、24b在索引的集合J上将这些输出求和,并且,得到的和被供给到求和电路25的各输入。 By summing circuit 24a, 24b which output summation index set J admiral and obtained and the summing circuit 25 is supplied to each input. 这从上输入减去下输入以产生软输出采样uk。 This input is subtracted from the next input to produce soft output samples uk.

[0113] 可以看出,该软输出产生器14b处理信号j以产生以下形式的软输出采样uk: [0113] As can be seen, the soft output generator 14b to generate a processed signal j in the form of soft output samples uk:

[0114] [0114]

Figure CN102027538AD00152

[0115] 其中,比例常数是统一的。 [0115] where the constant of proportionality is unity. 但是,如上所述,可以仅在J'个最重要项上取得电路24a和24b中的和。 However, as described above, only on the most important items J 'made circuits 24a and 24b, and. 因此,可以看出,检测器14b的软输出Uk按缩放比例因子近似在前面的分析中讨论的2型软输出Λ。 Therefore, it can be seen that the soft output detector Uk 14b by a scaling factor approximation type 2 soft output Λ discussed in the previous analysis.

[0116] 图8表示用于图5装置中的同步字检测器的第一实施例。 [0116] FIG. 8 shows a first embodiment of the sync word detector in the apparatus of FIG. 5 for. 如图所示,本实施例的检测器12a具有七个延迟元件D,其具有与各乘法器连接的输入/输出。 As shown, the detector 12a of the present embodiment has seven delay elements D, which has an input / output connected to the respective multipliers. 如上面描述的那样由软输出检测器11产生的一系列的软输出采样Uk通过延迟元件被计时,使得八个采样的滑动块被供给到乘法器输入。 As described above, as a series of soft output sample Uk soft output detector 11 is clocked through the delay produced by element, such that the sliding block of eight samples are supplied to the multiplier input. 这些乘法器的其它输入接收所示的已知的同步字位ρ。 Other input received multipliers shown in these known synchronization word bits ρ. 、Pl、…、p7(其中,pQ=l并且,对于i=l、…、7,P1 = -1)。 , Pl, ..., p7 (where, pQ = l and, for i = l, ..., 7, P1 = -1). 各乘法器的输出由此是表示当前块的八个软采样中的一个和相应的同步字位之间的相关性的位相关值。 Whereby the output of each multiplier is a correlation between the value of eight bits associated soft sampling of the current block and one of the corresponding bits between the synchronization word. 各位相关值被供给到各加法器的一个输入。 Members correlation value is supplied to an input of each adder. 相关的软采样值的预定函数h被供给到从位相关值减去函数的各加法器的另一输入。 Predetermined function associated soft sample value h is supplied to the correlation value is subtracted from the bit adder functions of each other input. 然后,得到的来自所有八个加法器的值在加法器30中被求和,以为软输出采样流中的当前块位产生块相关值Rk。 Then, the value obtained from all eight adder are summed in the adder 30, that the soft output sample stream at the current block bit generating block-related value Rk. 块相关值Rk被输出到最大相关检测器31。 Block correlation values Rk is output to the maximum correlation detector 31. 它用来自软输出检测器的(N+L-1) = 36+8-1 = 43采样序列中的最大块相关值Rk检测块位置。 It uses the maximum block correlation value Rk detecting block from the soft output detector (N + L-1) = 36 + 8-1 = 43 sampling position in the sequence. 即,在值Rk最大的N = 36块位置的序列中,相关检测器识别位置n = l, That is, the maximum value of Rk N = 36 positions in the sequence, the correlation detector to identify the location of n = l,

Figure CN102027538AD00153

. 相关检测器31的输出是表示所识别的1的值的帧同步信号。 The output of the correlation detector 31 shows the frame 1 of the identified synchronization signal values.

[0117] 在字同步检测器的本实施例中,预定的函数h(uk)由下式给出: [0117] In the word sync detector of this embodiment, the predetermined function h (uk) is given by the following equation:

[0118] [01]

Figure CN102027538AD00154

[0119] 其中,Es、炉、SNR在前面的分析中被规定。 [0119] where, Es, stove, SNR in the previous analysis is specified. 因此,艮是卩?^/[编码信号8和S1 (t)的能量。 Therefore, Burgundy is Jie? ^ / [Coded signal 8 and S1 (t) of energy.

[0120] [0120]

Figure CN102027538AD00155

[0121] 并且,信号噪声比SNR为: [0121] In addition, signal to noise ratio (SNR) is:

[0122] [0122]

Figure CN102027538AD00156

[0123] 其中,Ntl是伺服信道中的噪声过程的一侧谱密度。 [0123] where, Ntl is a side channel noise spectral density servo process. 可以看出,字同步检测器12a 的效果是要表示软输出采样流中使以下的统计最大化的位置上的帧同步化的获取: As can be seen, the word sync detector 12a showing the effect is to maximize the frame position statistical manipulation of the soft output sample stream following the synchronization acquisition:

[0124] [0124]

Figure CN102027538AD00161

[0125] 在字同步检测器12的优选实施例中,预定的函数h被简化,并且特别地与伺服信道中的SNR无关。 [0125] In the word sync detector 12 of the preferred embodiment, the predetermined function h is simplified, and in particular independent of the servo channel SNR. 在图9中示出优选的字同步检测器12b。 In FIG. 9 shows a preferred word synchronization detector 12b. 这一般与图8对应,因此,类似的要素被标出,并且,这里只描述关键的不同。 This generally corresponds to FIG. 8, therefore, like elements are indicated, and the key differences described here only. 特别地,函数h(uk)是软输出采样值|h(Uk)|的模数。 In particular, the function h (uk) is the soft output sample value | h (Uk) | modulus. 因此,在本实施例中,在软输出采样流中使以下的统计最大化的位置上表示帧同步化: Therefore, in this embodiment, the position of the soft output sample stream to maximize statistical manipulation of the following frame synchronization, said:

[0126] [0126]

Figure CN102027538AD00162

[0127] 上述的基于连续时间PPM编码LTO伺服信号的软输出检测的字同步化装置为带驱动器中的字同步化系统提供了简单、有效和健壮的实现。 [0127] Continuous Time PPM encoding LTO servo signal word soft output detection of said synchronization means is a belt drive word synchronization system provides a simple, effective and robust implementation. 并且,模拟结果表示提出的装置大大地优于常规的LPOS字同步化技术。 Furthermore, simulation results are shown apparatus proposed substantially better than the conventional LPOS word synchronization technology. 特别地,为了评估与常规的方法比较的健壮性,在存在加性高斯白噪声的情况下模拟了产生用于LPOS检测的软判决的伺服信道。 In particular, in order to evaluate and compare the robustness of conventional methods, in the presence of additive white Gaussian noise to simulate the servo channel generates soft-decision LPOS detection. 图10示出理想的定时恢复的结果。 Figure 10 shows the results of the ideal timing recovery. 可通过使用图1所示的硬LPOS判决和US 7,245,450 的常规的硬判决LPOS字同步化系统获得与常规的硬判决相关器对应的曲线。 By using hard LPOS judgment shown in FIG. 1 and US 7,245,450 conventional hard decision LPOS word synchronization system obtained with conventional hard decision correlator corresponding curve. 通过使用图6的软输出检测器和图9的同步字检测器获得软判决相关器的曲线。 Obtain soft decisions related to the curve by use of the soft output detector and the sync word detector 6 of Figure 9. 结果表明:对于同步检测误差率10_2,使用本发明的字同步装置比常规硬判决系统健壮约9dB。 The results showed that: For synchronous detection error rate 10_2, use word synchronization device of the present invention than conventional systems robust hard decision about 9dB. 注意,在更低的同步检测误差率下,由使用本发明的字同步装置提供的增益比9dB大。 Note that in a lower error rate synchronous detection, gain from the use of the present invention to provide a word synchronization means is larger than 9dB. 并且,图11示出实际的非理想定时恢复方案的模拟结果。 And, Figure 11 shows the simulation results of the actual non-ideal timing recovery program. 由于在情况下观察不到帧同步误差,因此未看到与使用本发明的字同步装置对应的曲线。 Since not observed in the case of frame synchronization error, and therefore do not see the curve corresponding to the use of the present invention with a word synchronizing means.

[0128] 当然,可以理解,可以在不背离本发明的范围的情况下对于示例性实施例提出许多的变化和修改。 [0128] Of course, it is understood, can be made without departing from the scope of the present invention for an exemplary embodiment of the case made a number of changes and modifications. 例如,虽然具体参照LTO伺服图案描述了本发明的操作,但是,本发明当然可被应用于其它的PPM编码伺服图案。 For example, although described with particular reference to the operation of LTO servo pattern of the present invention, however, the present invention can of course be applied to other PPM-encoded servo pattern.

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Classifications
International ClassificationG11B5/584
Cooperative ClassificationG11B5/584
European ClassificationG11B5/584
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