JP3884831B2 - Playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a playback apparatus for sequentially playing back signals recorded on a plurality of tracks, and more particularly to an improvement in a tracking control system thereof.
[0002]
[Prior art]
In a segment-recording type helical scan magnetic recording / reproducing apparatus that divides and records digital image data in units of one screen into a plurality of tracks on a magnetic tape, the timing for scanning a reference tracking among a plurality of tracks and the size of one screen It is necessary to synchronize the phase of reproduction reference timing (referred to as reproduction V) (referred to as V synchronization). A DVC format magnetic recording / reproducing apparatus (referred to as a VTR), which is a consumer digital VCR format, is also a segment recording type VTR, and is a system that requires the V-synchronous operation described above.
[0003]
Further, in the above DVC format, a tracking pilot signal is recorded on a track recorded in the tilt direction, and control (referred to as tracking) is performed so that the head correctly follows the track using this pilot signal.
[0004]
FIG. 4 is a diagram showing a recording format of the DVC format 526-60 system.
[0005]
In the DVC format, one track 24 shown in FIG. 4 is composed of an ITI area 25, an audio (Audio) area 26, a video (Video) area 27, and a subcode (SubCode) area 28. In the ITI area 25, data indicating a recording format, narrow track recording identification data (referred to as SL / LP discrimination data), a signal indicating a track start, and the like are recorded. Also, audio information and system data associated therewith are recorded in the audio area 26, image information and system data associated therewith are recorded in the video area 27, and the absolute position number of the track is recorded in the subcode area 28. (Referred to as ATN) and other data related to the entire system are recorded.
[0006]
In the 525-60 system, ten tracks 24 configured as described above (T0 to T9 or U0 to U9 in FIG. 4) record one screen (referred to as a frame) of image data and audio data. It is like that. These ten tracks are numbered in units of two by a value called a track pair number. That is, T0 and T1 are track pair number 1, T2 and T3 are number 2, T4 and T5 are number 3, T6 and T7 are number 4, T8 and T9 are number 5, and so on. The track pair number is recorded in the audio area 26 and the video area 27 as system data accompanying audio and video in the recording track.
[0007]
In the DVC format, a pilot signal is superimposed on the digital recording data so that the head can correctly scan the inclined track. This pilot signal includes an f1 signal having a frequency component of 1/90 of the reference clock 41.85 MHz and an f2 signal having a frequency component of 1/60. In FIG. 4, the track on which the f1 signal is superimposed is shown as the f1 track, the track on which the f2 signal is superimposed is shown as the f2 track, and the track on which neither the f1 signal nor the f2 signal is superimposed is shown as the f0 track. The rotation is repeated in units of four tracks of f0, f1, f0, and f2.
[0008]
The actual tracking of the head to the inclined track (tracking) is the f1 and f2 signals reproduced on the f0 track (reverse azimuth head reproduction, but since the frequency is low, the reproduction azimuth loss is small, and the pilot of the adjacent track Signal can be reproduced) at the level after passing through the band-pass filter and controlled so as to be the same level. That is, a tracking signal of f2-f1 is generated on the T0 / T4 / T8 / U2 / U6 track and f1-f2 is generated on the T2 / T6 / U0 / U4 / U8 track.
[0009]
Here, based on the relationship between the 10-unit frame and the 4-track unit pilot signal, the frame (T0 to T9) starting from the rotation of the pilot signal of f0 · f1 and the frame starting from the rotation of the pilot signal of f0 · f2 (U0 to U1), the former frame is called pilot frame 0, the latter frame is called pilot frame 1, and the data of this pilot frame is also recorded in the ITI area 25 of the track. .
[0010]
[Problems to be solved by the invention]
However, in the tape drive control of the conventional V synchronous control as described above, the pilot frame number, which is one of the data for determining the head scan position, is recorded in the ITI area at the head of the track. There was a problem.
[0011]
That is, from the aspect of track bending and head touch stability, the reproduction of the data at the beginning of the track has many unstable factors, and in particular, there is a possibility that the pilot frame number cannot be reliably determined when the mode is changed to the reproduction.
[0012]
If the pilot frame number cannot be determined and is erroneously recognized, the phase control is shifted every time the V synchronization control is erroneously recognized, resulting in a longer mode transition time.
[0013]
The present invention has been made by paying attention to the above-mentioned problems, and provides a playback device that can quickly pull the device into the tracking control state even when the tracking state is unstable, such as when switching to the playback mode. It is intended to provide.
[0014]
[Means for Solving the Problems]
  In order to achieve the above object, in the present invention, the reproducing apparatus is configured as described in (1) below.
(1) Reproducing means for scanning a plurality of recording tracks on the tape with a reproducing head and sequentially reproducing the video signals and the pilot signals for tracking control recorded on the plurality of recording tracks;
Generation means for generating a tracking error signal indicating a positional relationship between the recording track and the reproducing head by selectively using the pilot signal included in the reproduction signal from the specific area on one recording track and the video signal recording area. When,
A playback apparatus comprising switching means for switching an area from which the pilot signal is obtained to the specific area in response to an instruction to shift to the playback mode.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
FIG. 1 is a block diagram showing the configuration of the main part of a playback apparatus according to the present invention, and shows the configuration of a V synchronization control system in a microcomputer in a steady state during playback in a DVC format system. 2 and 3 are timing charts showing the operation of the system of the present embodiment, and show the relationship between signals generated by the operation of the system.
[0018]
In FIG. 1, 1 is a reproduction mode transition unit for instructing to shift to a reproduction mode, and 2 is a V synchronization lock detection unit for detecting V synchronization lock from head phase difference data. The other constituent elements are the same as those in FIG.
[0019]
FIG. 5 is a diagram showing the configuration of a recording / reproducing system based on the recording format of the DVC format system, and the recording / reproducing operation of this system will be described below.
[0020]
First, the recording operation will be described.
[0021]
The video signal is input from the video signal input unit 29 in units of frames and converted into digital data by the quantization unit 30. The transformed data is orthogonally transformed by the DCT transform circuit 31 and converted to frequency space data, and then compressed by the variable length coding unit 32, and errored together with system data (not shown) accompanying the video. An error correction capability is added by the correction encoding unit 33.
[0022]
On the other hand, the audio signal is input from the audio signal input unit 34, converted into digital data by the quantization unit 35, and digitally processed. The digitally processed data is added with error correction capability by an error correction encoder 36 together with system data (not shown) associated with the audio.
[0023]
Further, the accompanying system data is input from the additional digital signal input unit 37, and a part thereof is encoded together with the audio data and the video data (not shown), but the others are error correction encoding units. At 38, correction capability is added. In general, audio and video data have a strong error correction capability, and system data has an error correction capability that is not enhanced.
[0024]
These data are recorded on the magnetic tape 39. The recording mechanism will be described first. The magnetic tape 39 is transported by the tape transport unit 40. The magnetic tape 39 forms an inclined recording track when the magnetic head 42 scans in the direction of the inclined track in the rotary drum unit 41.
[0025]
The tape transport unit 40 includes a pinch roller capstan tape transport mechanism 43, a capstan motor 44, and a rotation speed detector 45. The magnetic tape 39 is rotated and pinched by the pinch roller capstan tape transport mechanism 43 in the longitudinal direction of the tape. Transport. Further, the capstan motor 44 that gives the rotational force is detected by the rotational speed detection unit 45, and an error signal is sent to the drive circuit 47 by the microcomputer (microcomputer) 46 so that the speed becomes the target speed. The rotation is controlled at a constant speed by the drive circuit 47.
[0026]
On the other hand, the rotary drum unit 41 includes a magnetic head 42, a drum motor 48 that rotates the magnetic head 42, and a rotational speed detector 49 and a rotational phase detector 50 that detect the rotational speed and phase thereof. The drum motor 48 that rotates the magnetic head 42 is detected by the rotation speed detector 49, and a speed error signal is sent to the drive circuit 51 by the microcomputer 46 so that the speed becomes the target speed. 51 is controlled to rotate at a constant speed. The detected rotational phase data is sent from the rotational phase detector 50 to the microcomputer 46, and the microcomputer 46 generates a phase error signal so as to coincide with the target rotational phase. To control.
[0027]
From the rotational phase data, a microcomputer 46 generates a head switching signal for switching the magnetic head 42 for writing data to the recording track and a head recording control signal for controlling the writing timing. These timing signals are used when digital data is written on the magnetic tape 39. The operation control block in the microcomputer is shown in FIG.
[0028]
Next, an operation of writing the above-described error correction encoded digital data on the magnetic tape 39 will be described. The encoded digital data is rearranged into a recording format for each track by a head switching signal sent from the microcomputer 46 by the mapping unit 52. Here, as described above, one frame of data is data of 10 tracks.
[0029]
Further, digital modulation is performed by the 24-25 modulator 53 so as to be DC-free. This modulation method is switched for each track by a head switching signal sent from the microcomputer 46. As a result, a pilot signal for tracking during reproduction is generated.
[0030]
Finally, the digital data is amplified by the recording amplifier 54 and converted into a digital recording signal, and the recording timing is controlled by the head recording control signal sent from the microcomputer 46 to selectively select one magnetic head 42 having a different azimuth. Send the above digital signal. The magnetic head 42 performs digital saturation recording on the magnetic tape 39.
[0031]
Next, an operation for reproducing the information digitally recorded as described above will be described.
[0032]
First, the flow of the reproduced signal will be described. The digitally recorded information is converted from the magnetic tape 39 into a reproduced digital signal by the magnetic head 42. This digital signal is timed by the head reproducing device generated by the microcomputer 46 from the rotational phase of the drum motor 48 and amplified by the reproducing amplifier 55.
[0033]
Then, the 24-25 demodulator 56 takes out the digital data for each track according to the head switching signal generated by the microcomputer 46 from the rotation phase of the drum motor 48 with respect to the amplified signal. The track unit digital data is rearranged by the mapping unit 57 into video information, audio information, and system data.
[0034]
The reproduced video information is subjected to error correction processing by the error correction decoding unit 58, then the data compressed by the variable length decoding unit 61 is expanded, and the frequency space data is converted to the inverse DCT conversion unit 62. Is converted back to time-space digital data. The digital data is converted back to an analog signal by the DA converter 63, and a video signal is output through the video signal output unit 64.
[0035]
Also, the audio information is extracted from the mapping unit 57 and related data is extracted and subjected to error correction processing by the error correction decoding unit 59. Then, the audio information is converted to an analog signal by the DA converter 65, and the audio signal is output from the audio signal output unit 66. Is output. Further, the system related data is extracted from the mapping unit 57, subjected to error correction processing by the error correction decoding unit 60, and then extracted from the additional digital signal output unit 67. At this time, pilot frame number data and track pair number data are returned to the microcomputer 46 in order to obtain a partially reproduced track phase.
[0036]
Next, the operation of the playback mechanism will be described. This operation is basically the same as that of the recording system, except that the tracking signal from the reproduction signal and the track phase data described above are obtained.
[0037]
Since the digital signal obtained from the reproduction amplifier 55 of FIG. 5 includes a tracking signal superimposed at the time of recording, it is detected by the pilot signal detection unit 68 using a bandpass filter or the like. As can be seen from FIG. 3, when the head 42 scans the f0 track, pilot signal components of f1 and f2 of the adjacent tracks are generated. Therefore, if the difference data of the pilot signal level at the time of scanning the f0 track is used as a signal for the head 42 to follow the track, tracking can be performed.
[0038]
The pilot signal extractor 69 extracts the pilot signal level at a predetermined timing when the head 42 scans the f0 track from the microcomputer 46, and returns the data to the microcomputer 46 again.
[0039]
Next, the operation in the microcomputer 46 will be described. The rotational speed of the drum motor 48 is detected as described above, and is taken into the microcomputer 46 from the drum rotational speed input unit 18 of FIG. In this example, since one frame is recorded by 10 tracks, the drum motor 48 needs to rotate at a speed at which the head 42 can scan 10 times per frame (1.001 / 30 seconds). If the drum unit 41 is equipped with two normal heads, the drum unit 41 rotates at 149.85 Hz (= 30 / 1.001 * 10/2). Generate a target value. Then, the difference between the drum rotation speed and the target value is calculated by the speed error calculation unit 21 and the data is sent to the drum drive signal generation unit 23 as speed error data.
[0040]
Further, the rotational phase data of the drum motor 48 is taken into the microcomputer 46 from the drum rotational phase input unit 7. This rotational phase is also created by the target rotational phase generator 20. Then, as described above, the phase error calculation unit 22 calculates a difference from the phase target value such that the drum motor 48 rotates at 149.85 Hz, and sends the data to the drum drive signal generation unit 23 as phase error data.
[0041]
The drum drive signal generation unit 23 calculates total error data by applying an appropriate filter to the speed error data and phase error data described above, and sends it to the drive circuit 51 from the microcomputer 46 as a drum drive signal after DA conversion processing. With the above drum control, the drum motor 48 rotates at 149.85 Hz, and the head 42 rotates at a speed at which 10 tracks can be scanned in one frame.
[0042]
Next, the control of the capstan that drives the tape 39 will be described. The speed of the capstan is taken into the microcomputer 46 from the capstan rotational speed input unit 9 in the procedure described with reference to FIG. In this capstan, in order to accurately trace the recorded track, a target rotation speed generating unit 15 generates a target value that is the same speed as that during recording. Then, the difference between the target value and the capstan rotation speed is calculated by the speed error calculation section 14 and sent to the capstan drive signal generation section 17 as speed error data.
[0043]
Here, the head 42 performs an operation of scanning the track 10 times per frame at an accurate timing by the above-described drum motor rotation control. On the other hand, the tape 39 is fed at regular intervals by the above rotation speed control. Therefore, as described above, in order for the head 42 to trace the track accurately in accordance with the reference timing (reproduction V) of the reproduction signal, the phase in which the head 42 scans the reference track of 10 tracks in one frame. Therefore, it is necessary to perform tape drive phase control that matches the phase of the reference signal (reproduction V) of the frame to be reproduced, that is, phase control of the capstan motor 44.
[0044]
Therefore, capstan phase control in the normal reproduction mode will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the V synchronization control system during reproduction, and FIG. 2 is a diagram showing the operation timing.
[0045]
From the drum phase data (FIG. 2 (a)) from the drum rotation phase input unit 7 of FIG. 1, a head switching signal (FIG. 2 (2)) indicates which of the two heads is operating the track. b)) is generated by the head switching signal generator 6. Further, from the drum phase data, a head recording control signal is obtained by the head recording control signal generator 5, and a head reproduction control signal from the start point to the end point of the track recorded when the head traces the track. (Detection timing signal) ((d) in FIG. 2) is generated by the head reproduction control signal unit 4.
[0046]
Then, by using this control timing signal and the head switching signal, the digital signal reproduced by the two heads is selected by the reproducing amplifier shown in FIG. Can be amplified. At this time, if the head accurately traces the track 24, the reproduced RF signal looks as shown in FIG.
[0047]
Here, the RF signal is divided into signals from the areas 25 to 28 of the ITI, audio, video, and subcode as described with reference to FIG. By performing the above-described signal processing on the RF signal, pilot frame data for identifying the cyclic logic of the pilot signal is reproduced from the ITI area 25, and the position of the track in one frame from the audio and video areas 26 and 27 is determined. The indicated track pair number is played back. These data are respectively taken into the microcomputer 46 from the pilot frame reproduction data input unit 11 and the track pair reproduction data input unit 12 and sent to the head position phase difference calculation unit 16.
[0048]
As for the tracking signal, the pilot extraction signal generator 3 generates a pilot extraction signal that generates a signal at the f0 track and at substantially the center of the track from the drum rotation phase data. Then, at the timing of this signal ((e) in FIG. 2), the pilot signal level ((f) and (g) in FIG. 2) of the pilot signal detector (see FIG. 5) is extracted ((f) in FIG. ) And (g) arrow). This data is taken into the microcomputer (microcomputer) from the pilot signal input unit 10 and sent to the head position phase calculation unit 16.
[0049]
The head phase calculation unit 16 takes the difference of the pilot signal levels (f1, f2), generates error data with the sign inverted every two tracks, and shows how far the scan position of the head is from the f0 track. Generate phase error data. Specifically, if the error is calculated as (f2-f1) at the first f0 track and (f1-f2) at the next f0 track, f0 is the speed of the motor, and-is the motor deceleration direction. The phase to be scanned by the head can be determined in units of four tracks in which pilot signals of / f1 / f0 / f2 circulate.
[0050]
Further, the scanning relationship between 10 tracks per frame and the head can be determined from the track pair number. Therefore, the difference between the reference timing (reproduction V) of the reproduction signal from the reproduction reference timing signal input unit 13 and this data is the V-synchronous phase difference. Specifically, as described above, the track pair number is 0, 2, 3, 4 and increments in units of two tracks and circulates in units of frames. Therefore, if the difference between the reproduction V and the track pair number is converted. The phase difference of V synchronization can be calculated in units of two tracks.
[0051]
Here, the V sync phase difference can be calculated only in units of two tracks, but the head scan position can be determined in units of four tracks based on the f0 phase error data described above, so that the accuracy is sufficiently high. However, there are a frame starting with f0 / f1 / f0 / f2 (pilot frame number 0) and a frame starting with f0 / f2 / f0 / f1 (pilot frame number 1) due to the relationship between the pilot signal and the frame. In the unit f0 phase error data, a frame locked with track pair numbers 0, 2, and 4 and a frame locked with track pair numbers 1 and 3 appear. For this identification, the pilot frame number recorded in the ITI area 25 is effective.
[0052]
As described above, the head position phase difference calculation unit 16 calculates the phase difference between one of the 20 tracks and the reproduction V with the pilot frame number and the track pair number for V synchronization control, and f0 phase error data. By determining the head scan position in units of 4 tracks, the head position phase difference is calculated, and the capstan drive signal controller 17 adds the above speed and error data to perform the filtering process. After the DA conversion process, By sending a signal to the drive circuit 47 as a capstan drive signal, tape drive control of V synchronous control can be realized.
[0053]
Here, as shown in FIG. 2 (e), the data serving as the pilot signal for tracking is extracted at the timing of the center of the track because the information in the video area 27, that is, the video information is reproduced during normal reproduction. Because it is the main purpose. If the pilot signal is reproduced at a timing close to the beginning or end of the track, the track is bent and the information in the video area 27 cannot be obtained, and the reproduced image is broken, which is a fatal defect for VTR reproduction. It becomes.
[0054]
Hereinafter, the reproducing operation at the mode transition will be described with reference to FIG. In response to an instruction from the reproduction mode transition unit 1, each signal processing unit enters a reproduction operation similar to the conventional one (not shown). Here, only the reproduction of the pilot frame number will be described.
[0055]
In response to an instruction from the reproduction mode transition unit 1, the V synchronization lock detection unit 2 is first operated. The V synchronization lock detection unit 2 monitors the phase of the reproduction track number calculated from the pilot frame number and the track pair number and the reproduction V. When the phase difference is at a predetermined position, the V synchronization lock instruction is issued. If not, a V-synchronization unlock signal is issued.
[0056]
Since V synchronization is not locked at the initial stage when switching to the reproduction mode, an unlock signal is transmitted from the V synchronization lock detector 2 and sent to the pilot extraction signal generator 3. The pilot extraction signal generation unit 3 receives the above-described non-lock signal and opens in the ITI area 25 of FIG. 5 with the output clock of the head scan timing signal generation unit 8 generated by the signal from the drum rotation phase input unit 7. A signal (FIG. 3 (e)) is generated. With this signal, the pilot signal is extracted by the pilot signal extraction unit 69 of FIG. 5 as described above. This is shown in FIGS. 3 (f) and 3 (g).
[0057]
Here, in the DVC format, the pilot signal of the ITI area 25 is a signal originally prepared for after-recording, and since the area is short, the signal level is high so that the signal can be reliably obtained. In FIG. 3, the signal level is shown to be larger than the other areas, which is a schematic representation of the situation.
[0058]
As described above, the pilot signal in the ITI area 25 is taken into the microcomputer 46 from the pilot signal input unit 10 through the same path as the conventional example and processed by the head position phase difference calculation unit 16. The operation of the head position phase difference calculator 16 is the same as that of the conventional example. The difference is that the pilot signal data of the ITI area 25 is used.
[0059]
Since the signal of the ITI area 25 is used, tracking is controlled so that the ITI area 25 is in a just-on state. For this reason, the data of the ITI area 25, that is, the pilot frame number is reliably reproduced. Since tracking is performed in the ITI area 25, more reliable data can be detected by using the data in the audio area 26 for the track pair number.
[0060]
In this way, if a pilot frame number or a track pair number having a high reproduction error rate is used, the reproduction track number can be detected reliably and quickly, and the phase difference control of the reproduction V can be stabilized and speeded up.
[0061]
When the V synchronization control is locked, it is detected by the V synchronization lock detector 2 and a lock signal is sent to the pilot extraction signal generator 3. In response to this lock signal, the pilot signal extraction gate signal is switched to the original track center area.
[0062]
By following the above procedure, until the V-synchronization control at the time of mode transition is locked, tracking for reliably reproducing the playback track number-related data is realized, and after locking, the data in the video area 27 is the center. Tracking that covers the entire track can be realized.
[0063]
In this embodiment, since the data of the audio area 26 is used for the track pair number in the ITI toking period until the V synchronization control at the time of mode transition is locked, the track pair number is also not affected by the track bending. Can be played reliably.
[0064]
In this way, by performing V synchronization lock detection at the time of mode transition and switching the pilot signal extraction area to the area related to V synchronization control, it is possible to realize tracking that reliably reproduces data related to the reproduction track number. Thus, the V synchronization control at the time of mode transition can be realized stably and promptly.
[0065]
At this time, the detection area of the tracking signal may be changed when the magnetic head scans the reference recording track at the reference timing or at the time until that time.
[0066]
Also, the logic identification data of the tracking signal that is different for each screen is recorded in a different area away from the normal tracking area of the recording track until the reference timing for each screen matches the timing for scanning the reference position of the playback track. In the tape running mode, the tracking signal of the recording area of the identification data may be extracted, and in the tape running mode after both timings coincide, the tracking signal of the normal tracking area may be extracted.
[0067]
【The invention's effect】
As described above, according to the present invention, there is an effect that quick and reliable tracking control can be performed even when the reproduction mode is shifted.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a main configuration of an apparatus according to an embodiment of the present invention.
FIG. 2 is a timing chart showing the operation during normal playback of the apparatus of FIG.
FIG. 3 is a timing chart showing an operation at the time of mode transition of the apparatus of FIG.
FIG. 4 is an explanatory diagram showing a recording format of a DVC format tape.
FIG. 5 is a block diagram showing a configuration of a recording / reproducing yarn of the DVC format system.
[Explanation of symbols]
1 Playback mode transition
2 V synchronization lock detector
3 Pilot extraction signal generator
4 Head playback control signal generator
5 Head recording control signal generator
6 Head switching signal generator
8 Head scan timing signal generator
10 Pilot signal input section
11 Pilot frame playback data input section
12 Track pair playback data input section
24 recording tracks
39 Magnetic tape
42 Magnetic head
46 Microcomputer

Claims (14)

Reproducing means for scanning a plurality of recording tracks on the tape with a reproducing head and sequentially reproducing the video signals and tracking control pilot signals recorded on the plurality of recording tracks;
Generation means for generating a tracking error signal indicating a positional relationship between the recording track and the reproducing head by selectively using the pilot signal included in the reproduction signal from the specific area on one recording track and the video signal recording area. When,
A playback apparatus comprising switching means for switching an area from which the pilot signal is obtained to the specific area in response to an instruction to shift to a playback mode . 1 and screen the video signal is recorded over a plurality of the recording track, the pilot signal is an integer multiple of the number of tracks the number of tracks for one frame of the video signal corresponding to the recording period of the pilot signal and become not so, the plurality of claim 1 Symbol placement of the reproducing apparatus, characterized in that it is periodically recorded on the recording track. An identification code indicating the phase relationship between the recording track on which the video signal for one screen is recorded and the recording track on which one period of the pilot signal is recorded is recorded in a specific area of the recording track. claim 2 Symbol placing the reproducing apparatus characterized by. The recording track further includes a track number code indicating a track position in a plurality of recording tracks on which the video signal for one screen is recorded, and a specific track determined by the identification code and the track number code 4. A reproducing apparatus according to claim 3, further comprising control means for controlling the drive of the tape so that the scanning timing of the video signal and the reproduction reference timing of the video signal for one screen have a predetermined phase difference . The switching means further switches an area from which the pilot signal is obtained to the video signal recording area in response to a predetermined phase difference between the scan timing of the specific track and the reproduction reference timing. The reproducing apparatus according to claim 4 . Reproducing means for scanning a plurality of recording tracks on the tape with a reproducing head and sequentially reproducing the video signals and tracking control pilot signals recorded on the plurality of recording tracks;
Generation of generating a tracking error signal indicating the positional relationship between the recording track and the reproducing head by selectively using the pilot signal included in the reproducing signal from a specific area on one recording track and a central part area of the track Means,
A playback apparatus comprising switching means for switching an area from which the pilot signal is obtained to the specific area in response to an instruction to shift to a playback mode . The video signal of one screen is recorded over a plurality of the recording tracks, and the pilot signal is an integral multiple of the number of tracks corresponding to the recording period of the pilot signal. and become not so, the plurality of claim 6 Symbol mounting of the reproducing apparatus, characterized in that it is periodically recorded on the recording track. An identification code indicating the phase relationship between the recording track on which the video signal for one screen is recorded and the recording track on which the pilot signal for one period is recorded is recorded in a specific area of the recording track. 7. Symbol mounting of the reproducing apparatus, characterized in that. A track number code indicating a track position in a plurality of recording tracks on which the video signal for one screen is recorded is recorded on the recording track, and a plurality of the video signals on one screen are recorded. Control means for driving and controlling the tape so that a scanning timing of a reference track determined by the identification code and a track number code of the recording tracks and a reproduction reference timing of the video signal of one screen have a predetermined phase difference. 9. A playback apparatus according to claim 8, wherein The switching means further switches an area for obtaining the pilot signal to the central partial area in response to a predetermined phase difference between the scan timing of the reference track and the reproduction reference timing. 9 Symbol mounting of the playback device. A plurality of tracks on the tape are scanned by a reproducing head, and a pilot signal and a video signal periodically recorded on the plurality of tracks, and the track on which the video signal for one screen is recorded and 1 Reproducing means for reproducing an identification code indicating a phase relationship with the track on which the pilot signal for a period is recorded;
Included in the reproduction signal from the first area for satisfactorily reproducing the identification code in one track or the second area for satisfactorily reproducing the entire signal recorded on the recording track Generating means for selectively using a pilot signal to generate a tracking error signal indicating a positional relationship between the recording track and the reproducing head;
A reproducing apparatus comprising: switching means for switching a detection area for obtaining the pilot signal in the generating means . The first area is an area in which the identification code is recorded, the second area 11. Symbol mounting of the playback device is characterized in that the central part of the track. The reference track scan timing determined based on the identification code among a plurality of tracks on which the video signal of one screen is recorded and the reproduction reference timing of the video signal of one screen have a predetermined phase difference. 11. Symbol mounting of the reproducing apparatus characterized by comprising a control means for driving and controlling the tape. The switching means switches the detection area to the first area in response to a playback mode transition instruction, and then responds when a scan phase of the reference track and the playback reference timing have a predetermined phase difference. 14. The playback apparatus according to claim 13, wherein the detection area is switched to the second area .

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