CN1188313A - Long time recording mode using frame alignment signal and videorecorder - Google Patents
Long time recording mode using frame alignment signal and videorecorder Download PDFInfo
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- CN1188313A CN1188313A CN97100185A CN97100185A CN1188313A CN 1188313 A CN1188313 A CN 1188313A CN 97100185 A CN97100185 A CN 97100185A CN 97100185 A CN97100185 A CN 97100185A CN 1188313 A CN1188313 A CN 1188313A
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Abstract
The present invention relates to a long-time recording mode adopting frame alignment signal and video recorder, applicable to helical scan type anolog or digital signal video recorder. The frame alignment signal is prerecorded on the tape, and a frame interval recording mode is used to videotape so as to can prolong the tape recording time by N times. The commutation switch, preamplifier circuit, shaping circuits, bistable trigger-action circuit, tape control circuit, N frequency divider and phase averaging circuit are added in capstan servo-circuit of general video recorder, and the delay circuit, shaping circuit and magnetic head control electronic switch are added in its video head recording circuit so as to can implement said invention. Besides, the computer programme or special-purpose IC also can be used to implement said invention.
Description
The present invention relates to a kind of long-time magnetic tape recording mode and video recorder that adopts frame alignment signal, belong to the video tape recorder technical field.
Used monitoring video machine in the existing TV monitor system generally requires a dish video recording more than 24 hours.The time lapse VTR that provides in the market is to adopt the requirement that realizes non-volatile recording every the method for several seconds some two field pictures of sample note.Since the sampling interval stop to write down for up to several seconds, easily the error of omission of the quick situation of change in several seconds, thereby can not satisfy the requirement of monitoring.
At the problems referred to above, the inventor is once in application number is 96109824.4 Chinese invention patent application, a kind of " long-time magnetic tape recording mode and video recorder " is provided, adopt interval script holder's record mode to record a video, record one field signal in every N adjacent tv field period, tape transport also can be interrupted tape transport continuously.Though this mode have the time in sampling interval lack, can not fail to record, advantage such as reproduced picture is clear, find still to have the following disadvantages through experiment repeatedly.Wherein continuous canoe, no matter adopting hardware still is that software mode is realized, all must employing rotate the driven motor system at a slow speed, produces, debugs equal more complicated.And the interruption canoe because the tape transport time is relatively lacked (each one only 20 milliseconds), stops from starting, running to, although the time can strict be controlled, it is very even that but speed is difficult for, and therefore occurs the accurate inadequately phenomenon in magnetic track record position easily, influences reproduction quality.
The present invention is the further improvement to last invention.
The object of the present invention is to provide a kind of non-volatile recording mode that adopts frame alignment signal, be applicable to spiral scan analog or digital video signal recording.Before writing down first, on record-reproduce head, write down frame alignment signal L earlier.When record, as a reference signal, adopt interval frame recording mode to record a video with frame alignment signal L.
Another object of the present invention provides a kind of video recorder that adopts the non-volatile recording mode of above-mentioned frame alignment signal.
Basic design of the present invention is, uses the video-tape that has recorded frame alignment signal in advance to carry out record, write down the N1 frame signal in the cycle at every N adjacent television frame, and N/N1 is the prolongation multiple.The value of N satisfies N=na+N1, and wherein a is the natural number constant, and n is the television system constant, and the value of n satisfies n=n1b, and b is the natural number constant, and n1 is 2 for black-and-white television and TSC-system formula colour TV signal, is 4 for the pal mode colour TV signal.When carrying out writing task, tape running is a periodic breaks, and Cycle Length is N frame period, and the tape transport time is N1 frame period in each cycle, and stopping the tape transport time is (N-N1) individual frame period, and tape transport and record are synchronously.Tape running speed is preferably identical with common video recorder normal speed.The control signal CTL that the frame alignment signal L that prerecords can adopt common video recorder to adopt.
In order to realize above-mentioned recording mode, the invention provides the video recorder that adopts above-mentioned recording mode.Specified below in conjunction with embodiment and accompanying drawing.
Fig. 1 increases for the video recorder of the non-volatile recording mode of employing frame alignment signal provided by the present invention or the block scheme of improved related circuit, and the remainder circuit is identical with traditional common video recorder.
Fig. 2 is pairing circuit signal waveform synoptic diagram.
In Fig. 1, adopt the video recorder of the non-volatile recording mode of frame alignment signal, in the capstan servo circuit, increased frame alignment signal L magnetic head 1, change-over switch 2, pre-amplification circuit 3, shaping circuit 4, bistable trigger circuit 5, shaping circuit 6, tape transport start-stop control circuit 8, Fractional-N frequency device 12, phase equalization circuit 13, L signal generator 15.Magnetic head 1 connects pre-amplification circuit 3 input ends and L signal generator 15 output terminals respectively through change-over switch 2 controls, and pre-amplification circuit 3 output terminals connect the R input end of bistable trigger circuit 5 through shaping circuit 4.The S input end of bistable circuit 5 is connected with the output terminal of phase equalization circuit 13, and its output terminal connects tape transport start-stop control circuit 8 through shaping circuit 6, connects driven motor driving circuit 10 again.Vision signal V isolates field sync signal A through field synchronization separation circuit 11, sends into drum servo circuit 19 and Fractional-N frequency device 12 frequency divisions respectively, and the signal C behind the frequency division sends into the S input end of bistable circuit 5 through phase equalization circuit 13.Signal C is input video treatment circuit 16 simultaneously.In the video head writing circuit, delay circuit 7, shaping circuit 9, magnetic head control electronic switch 14 have been increased.Bistable trigger circuit 5 output terminals connect shaping circuit 9 through delay circuit 7, connect electronic switch 14 again, control of video magnetic head amplifying circuit 17.Vision signal V to be recorded is through video processing circuits 16 input video magnetic head amplifying circuits 17, and input video magnetic head 18 carries out record again.Field synchronization separation circuit 11, driven motor driving circuit 10, drum servo circuit 19, video processing circuits 16, video head amplifying circuit 17, video head 18 are the original circuit of video recorder.L is the frame alignment signal of prerecording on video-tape.E is the signal of control driven motor start-stop.F is the signal of control of video head records.When frame alignment signal L adopted the control signal CTL of common video recorder, magnetic head 1 can be used the CTL magnetic head, and generator 15 can utilize the original related circuit of video recorder.
In Fig. 2, the target A of institute among signal waveforms such as the A that is marked, C, L, E, F and Fig. 1, C, L, signals such as E, F are corresponding, and the B signal is that frame signal does not mark in Fig. 1.
The course of work of this video recorder is as follows:
1, records frame alignment signal L, for the blank video tape that uses first, the mode that writes down according to common video recorder can record frame alignment signal L, at this moment, the frame alignment signal L that L signal generator 15 produces switches on the relevant position that magnetic head 1 is recorded in video-tape through change-over switch 2.This is equivalent to computer format floppy " format ".If directly adopt the CTL signal as the L signal, this " format " can be carried out on common video recorder.
2, non-volatile recording: when being in the non-volatile recording duty, vision signal V input field synchronization separation circuit 11 to be recorded, produce field sync signal A, produce signal C through Fractional-N frequency device 12 frequency divisions, through the S end of phase equalization circuit 13 to bistable trigger circuit 4, the zero-time of control tape running.In tape transport, the L magnetic head is in the pickoff signals state, the frame alignment signal L that has recorded on the video-tape is read, after change-over switch 2 is delivered to pre-amplification circuit 3 amplifications, shaping circuit 4 shapings, remove to trigger bistable circuit R end, the stand-by time of control tape running.Bistable circuit 5 output control signal E through shaping circuit 6 shapings, deliver to 8 pairs of driven motor driving circuits 10 of tape transport start-stop control circuit and control, and control walking and stopping of driven motor.The E signal is through delay circuit 7 time-delays, and electronic switch 14 is delivered in shaping circuit 9 shapings, and control of video magnetic head 18 carries out videograph at corresponding tape transport in the time.Give birth to a starting and walk tape pulse and one and stop to walk tape pulse in that every N is only tight in the frame period, the time interval of two pulses was determined by the tape transport time that sets (N1 frame period), the time interval of initial pulse and stop pulse is the N1 frame time, stop pulse and following one-period initial pulse the time interval decide by the stand-by time that sets (N-N1).The simplest situation is N1=1.Tape running speed adopts normal tape running speed.Because frame alignment signal L records under normal tape transport situation, its interval location on video-tape is accurately.When non-volatile recording, although starting and to stop tape transport frequent, the speed of tape transport can produce error, but the starting of tape transport and stand-by time are accurately with respect to the record position of tape, have just guaranteed that also the vision signal track position that tape write down is very accurate.
3, reset: the vision signal that is write down can also can be put slowly with the common video recorder coloured image of resetting continuously, still image is observed.
Video recorder provided by the present invention increases or improved related circuit, can weave into computer program, in video recorder, augment control program among original CPU and realize, also can with the original relevant integrated circuit combination of video recorder, be designed to special IC.
Non-volatile recording mode provided by the invention and video recorder have the following advantages:
1, can transform common video recorder as the non-volatile recording video recorder easily, with a dish 180 Minute video-tape can record 15 hours, more than 27 hours.
2, sample note stops to be spaced apart Millisecond, can not lose artificial quick acting record.
3, institute's document image can with common video recorder by normal speed playback coloured image, also can weigh at a slow speed Put, still image, be convenient to observe details.
4, compare with common video recorder, it is few to increase circuit, thereby cost increases few.
Claims (9)
1, a kind of long-time magnetic tape recording mode that adopts frame alignment signal is applicable to spiral scan analog or digital video signal recording, it is characterized in that, before writing down first, writes down frame alignment signal L earlier on record-reproduce head; When record, as a reference signal, adopt interval frame recording mode to record a video with frame alignment signal L.
2, magnetic tape recording mode as claimed in claim 1 is characterized in that, record N1 frame signal in every N adjacent television frame cycle, and N/N1 is for prolonging multiple.
3, recording mode as claimed in claim 2, it is characterized in that, the value of N satisfies N=na+N1, wherein a is the natural number constant, n is the television system constant, and the value of n satisfies n=n1b, and b is the natural number constant, n1 is 2 for black-and-white television and TSC-system formula colour TV signal, is 4 for the pal mode colour TV signal.
4, recording mode as claimed in claim 1 is characterized in that, frame alignment signal L is the control signal CTL that common video recorder adopted.
5, recording mode as claimed in claim 2 is characterized in that, when carrying out writing task, tape running is a periodic breaks, and Cycle Length is N frame period, and the tape transport time is N1 frame period in each cycle, stop tape transport time in this (N-N1) individual frame period, tape transport and record are synchronously.
6, a kind of video recorder that adopts recording mode as claimed in claim 5, it is characterized in that, in the capstan servo circuit, increased frame alignment signal L magnetic head (1), change-over switch (2), pre-amplification circuit (3), shaping circuit (4), bistable trigger circuit (5), shaping circuit (6), tape transport start-stop control circuit (8), Fractional-N frequency device (12), phase equalization circuit (13), L signal generator (15), magnetic head (1) connects pre-amplification circuit (3) input end (3) and L signal generator (15) output terminal respectively through change-over switch (2) control, and pre-amplification circuit (3) output terminal connects the R input end of bistable trigger circuit (5) through shaping circuit (4); The S input end of bistable circuit (5) is connected with the output terminal of phase equalization circuit (3), and its output terminal connects tape transport start-stop control circuit (8) through shaping circuit (6), connects driven motor driving circuit (10) again; Vision signal V isolates field sync signal A through field synchronization separation circuit (11), sends into drum servo circuit (19) and Fractional-N frequency device (12) frequency division respectively, and the signal C behind the frequency division sends into the S input end of bistable circuit (5) through phase equalization circuit (13); Signal C is input video treatment circuit (16) simultaneously; In the video head writing circuit, delay circuit (7), shaping circuit (9), magnetic head control electronic switch (14) have been increased; Bistable trigger circuit (5) output terminal connects shaping circuit (9) through delay circuit (7), connects electronic switch (14) again, control of video magnetic head amplifying circuit (17); Vision signal V to be recorded is through video processing circuits (16) input video magnetic head amplifying circuit (17), and input video magnetic head (18) carries out record again.
7, video recorder as claimed in claim 6 is characterized in that, magnetic head (1) adopts common video recorder CTL magnetic head, and generator (15) utilizes the original related circuit of video recorder.
8, video recorder as claimed in claim 6 is characterized in that, increase or improved related circuit can be weaved into computer program, in video recorder, augment control program among original CPU and realize.
9, video recorder as claimed in claim 6 is characterized in that, increase or improved related circuit can with the original relevant integrated circuit combination of video recorder, be designed to special IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100185A CN1188313A (en) | 1997-01-17 | 1997-01-17 | Long time recording mode using frame alignment signal and videorecorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100185A CN1188313A (en) | 1997-01-17 | 1997-01-17 | Long time recording mode using frame alignment signal and videorecorder |
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| Publication Number | Publication Date |
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| CN1188313A true CN1188313A (en) | 1998-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN97100185A Pending CN1188313A (en) | 1997-01-17 | 1997-01-17 | Long time recording mode using frame alignment signal and videorecorder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102782753A (en) * | 2010-03-02 | 2012-11-14 | 国际商业机器公司 | Method using alternative timing intervals in a servo band |
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1997
- 1997-01-17 CN CN97100185A patent/CN1188313A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102782753A (en) * | 2010-03-02 | 2012-11-14 | 国际商业机器公司 | Method using alternative timing intervals in a servo band |
| CN102782753B (en) * | 2010-03-02 | 2016-06-08 | 乐天株式会社 | The method using alternative time interval in servo belt |
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