JPH06153133A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide the magnetic recording and reproducing device by which highly accurate reproduction/edit on a narrow track recording is attained. CONSTITUTION:A video signal and an audio signal are recorded to an independent area having non-recording tracks 1,3 whose width is more than the track width in the track width direction and having a non-recording track 4 of a prescribed length in the track lengthwise direction at all edit points of the video signal and the audio signal on a medium, and when a reference signal is recorded on other area than recording data area 13 of the video signal and the audio signal, the reference signal is recorded on a complete independent area on the medium having the non-recording track of a prescribed length in the lengthwise direction of the track between the video audio signal recording area and the reference signal recording area and a non-recording track whose width is more than a track width in the track width direction between the reference signal recording areas, the reference signal is not erased/revised at edit and the tracking is made based on the reference signal at reproduction and edit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for recording a video signal and an audio signal, and particularly for a VTR or a video disc suitable for high-performance editing even in narrow track recording. The present invention relates to a magnetic recording / reproducing device.

[0002]

2. Description of the Related Art In a VTR, it is general to increase the utilization efficiency of a tape by eliminating a guard band between video tracks on a recording medium by utilizing azimuth loss. Further, as the performance of the recording medium and the magnetic head has been improved, the recording density has been improved so that the recording wavelength can be shortened and the track width can be narrowed.

However, when inserting or assembling and editing a tape recorded with such a narrow track width, the bending of the video track due to the mounting accuracy or adjustment error of the mechanism portion or the tape feeding speed during editing is caused. Due to the pitch deviation, etc., the recording track width decreases before and after the edit point, or the signal recorded at the same azimuth angle and left to be originally edited remains unerased. When an edited tape that has undergone such deterioration on the tape pattern is played back, problems occur in that the playback image is disturbed before and after the editing point, and in digital recording the error rate increases. For this reason, even if high-density recording is made possible by improving the performance of the recording medium or the magnetic head, the VTR that requires the editing function may not be able to fully utilize the improved performance for this high-density recording.

As a method of ensuring the editing performance in such narrow track recording, in the case of multi-channel recording, a guard band is formed for each scanning of the rotary head cylinder by adjusting the head mounting height on the rotary cylinder. , There is a thing that this track band absorbs track bending and pitch deviation that deteriorate the tape pattern at the editing point.

However, in the above method, although the editing of the video signal is performed in the field unit at the minimum, usually in the frame unit, the guard band is formed at every scanning. This is effective when the video track is formed in field units or frame units, but when using high-speed scanning to form a video track and record segments, a meaningless guard band occurs and the tape is used. It will reduce efficiency.

Therefore, in a VTR in which a high speed scanning is performed to form a video track for segment recording,
A guard band is formed in field units or frame units, and video signals and audio signals are recorded in independent areas via the guard bands, so tape can be used while preventing deterioration at editing points even during editing work such as post-recording. There is a method of improving efficiency.

[0007]

However, in the VTR in which a video track is formed by high-speed scanning and segment recording is performed as described above, a guard band is formed in a field unit or a frame unit, and a video signal and an audio signal are further formed. Even if the data is recorded in an independent area via the guard band, the guard band width needs to be larger than the expected track bending or pitch deviation, and a larger guard band width is required in consideration of compatible editing.

In view of the above point, the present invention does not cause distortion of video and audio at the editing point even in narrow track recording.
It is another object of the present invention to provide a magnetic recording / reproducing apparatus which does not lower the high tape utilization efficiency which is a characteristic of narrow track recording.

[0009]

In recording a video signal, an M channel audio signal, and K tracking reference signals on a recording medium for each period using a rotary head cylinder, for each first period. In the area where the video signal recording area and the audio signal recording area for each second period are adjacent to each other in the width direction of the track, the L tracks at the boundary are left in a non-recorded state, and The portions adjacent to each other in the length direction of the track record the respective signals in a completely independent area on the recording medium as a non-recording state over a predetermined length of the boundary track.
When recording each tracking reference signal for each third period outside the recording data area (that is, the data track) of the video and audio signals, the video and audio signal recording area and the tracking reference signal recording area are tracked. Of the tracks adjacent to each other in the lengthwise direction are in a non-recorded state over a predetermined length of the track at the boundary, and the part where the tracking reference signal recording area is adjacent to the track widthwise has no N tracks at the boundary. The recording state is recorded in a completely independent area on the recording medium, and the K tracking reference signals are not erased or updated even during editing.
This is a configuration including at least a means for performing tracking based on the tracking reference signal during reproduction or editing.

[0010]

According to the present invention, with the above-described structure, a non-recorded track having a width larger than the track width in the track width direction is provided at all edit points of the video signal and the audio signal on the recording medium in the track length direction. Is recorded in an independent area having an unrecorded track of a predetermined length, and when the tracking reference signal is recorded outside the recording data area (ie, data track) of the video and audio signals, the video and audio signal recording is performed. An unrecorded track having a predetermined length in the length direction of the track between the area and the tracking reference signal recording area,
Further, in the track width direction between the tracking reference signal recording areas, the tracking reference signal is recorded in a completely independent area on a recording medium having a non-recorded track having a track width or more. Erase /
Tracking is performed based on the tracking reference signal at the time of playback or editing so as not to be updated, and high-accuracy tracking is ensured even when editing a plurality of times, and there are track bends and pitch deviations. In addition, since insert recording or assembly recording can be performed after erasing with an erasing head wider than the track width at the time of editing, there is a possibility that the track width decreases or the track remains unerased at any tape editing point including compatible tape. In addition, the mounting accuracy and adjustment accuracy of the mechanical section and the tape feeding accuracy during editing can be further eased, and the editing performance in narrow track recording can be secured.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a recording track pattern diagram in one embodiment of the present invention, and FIG. 2 is a recording system signal processing block diagram of a magnetic recording / reproducing apparatus in this embodiment. In this embodiment, the minimum editing unit of the video signal is the field unit and the audio signal is 8 units.
The minimum editing unit of the channel is the field unit, and the heads of 8 channels are mounted on the rotating cylinder so that they face each other 180 °, and the recording medium is a cylinder for dividing the head angle (ie 180 °) or more to record the tracking reference signal. For example, a case in which the rotary cylinder is wound around, and the rotary cylinder is rotated at a rotational speed five times the frame frequency (that is, 80 recording tracks in one frame period are 40 recording tracks in one field period) and digital recording is performed. I will explain.

It is assumed that the tracking reference signal is recorded at two locations before and after the recorded data area (ie, data track) of the video and audio signals (ie, outside 180 °).

In FIG. 1, 1 and 3 are non-recorded tracks, 7 to 12 are 37 video recording sub-tracks for recording a 1-field video signal, and 2 is 8-channel audio for each 1-field period. The signal is an audio recording sub-track (for example, 5) and is a track in which recording is separately performed in a non-recording state track (for example, 4) having a predetermined length in the track length direction. Reference numeral 6 is a tracking reference signal recording sub-track recorded at two positions before and after the video and audio data tracks by winding a recording medium around a rotating cylinder at an angle ratio of the head (that is, 180 °) or more, and 13 is a head angle. The recording data area (ie, data track) length of the video and audio signals recorded within 180 ° is shown.

Further, in FIG. 2, reference numerals 14, 15 and 16 are input terminals for inputting a luminance signal (Y) and two color difference signals (Pr, Pb) respectively, and 17 to 24 are input audio signals of 8 channels. Input terminal, 25 is the Y signal,
A recording system video signal processing circuit for A / D converting the Pr signal and the Pb signal and dividing the video signal into recording channels for each field unit, adding an outer code, and the like, and 26 denotes an A / D conversion of the 8-channel audio signal. A recording system audio signal processing circuit for converting and dividing an image signal into field units and adding an outer code, etc., 27 is a tracking reference signal generator, 28 is a tracking reference signal based on a control signal, and is in a non-recording state. And the reference signal recording state are switched to 30, 32, 34
The signal processing circuits 4 and 29 for outputting to the signal processing circuit 3 of the signal processing circuits 1 and 36 are input terminals of the control signal input to the signal processing circuit 4 of 28.

The control performed by the signal processing circuit 4 means that the tracking reference signal is in the recording state at the time of all erasing or new recording, but is in the non-recording state at the time of editing, and the control of not erasing / updating the reference signal is performed. .

Reference numerals 30, 32 and 34 add an inner code, a sync, an ID, a recording modulation, etc. to the video signal divided into the recording channels to record a non-recording state, a video data recording state and a tracking reference signal recording. The signal processing circuits 1, 31, 33, 35 and 37 for switching the state and supplying the recording signals to the recording heads of the respective recording channels (first, third and fifth channels) are divided into the recording channels. Addition of inner code, sync, addition of ID, recording modulation, etc. to the video signal, and switching between the non-recording state and the video data recording state for each recording channel (2nd, 4th, 6th and 8th channels). Signal processing circuits 2 and 36 for supplying a recording signal to the recording head of the recording head and the recording system audio signal processing circuit assigned to the recording channel (seventh channel). The inner signal is added to the audio signal output from the device 6, sync, ID is added, recording modulation is performed, and the non-recording state, the video data recording state, the audio data recording state, and the tracking reference signal recording state are switched. Signal processing circuits 3 and 38 for supplying recording signals to the recording head
To 45 are recording heads corresponding to the signal processing circuits of 30 to 37 (that is, the first to eighth channels), respectively, and 46.
Is a recording medium.

The operation of the magnetic recording / reproducing apparatus of this embodiment constructed as described above will be described below. First, the Y, Pr, and Pb signals input from the input terminals are A / D converted by the recording system video signal processing circuit 25, and then the video data is stored in a temporary memory (not shown), and the predetermined data is stored. The data is read from the memory in accordance with the format, divided into recording channels, a correction code for digital recording is added, and video data is output for each channel. Similarly to the video signal, the audio signal is A / D converted by the recording-system audio signal processing circuit 26 and then input to the signal processing circuit 3 of 36.

The signal processing circuit 1 of 30, 32, and 34 time-division-multiplexes the video data divided into the recording channels and the tracking reference signal, and adds a correction code, a sync, an ID, and records to the video data. Modulation or the like is performed to switch the non-recording state, the video data recording state, and the tracking reference signal recording state to supply the recording signals to the recording heads 38, 40, and 42 of the first, third, and fifth channels, respectively.

Signal processing circuit 2 of 31, 33, 35 and 37
Performs correction code addition, sync, ID addition, recording modulation, etc. on the video data divided into the recording channels, and switches between the non-recording state and the video data recording state, respectively. 8th channel recording head 3
A recording signal is supplied to 9, 41, 43 and 45.

The signal processing circuit 3 of 36 includes the video data assigned to the seventh recording channel, the audio data output from the recording system audio signal processing circuit 26, and the 2
The reference signal for tracking output from the signal processing circuit 4 of No. 8 is time-division-multiplexed, and correction code is added to video and audio data, sync, ID is added, recording modulation, etc. A recording signal is supplied to the recording head 44 of the seventh channel by switching between the recording state, the audio data recording state, and the tracking reference signal recording state. The video data, the audio data, and the tracking reference signal are recorded on the recording medium 46 via the recording heads 38 to 45. At the time of reproduction / editing, tracking control is performed so that the reference signal reproduction output is maximized based on the tracking reference signal.

As described above, according to this embodiment, when the video signal, the 8-channel audio signal, and the plurality of tracking reference signals are recorded on the recording medium, the video signal in the field unit which is the minimum editing unit. And a voice signal corresponding to a field period which is the minimum editing unit, a non-recorded track having a track width in the track width direction on the recording pattern, and a predetermined length capable of ensuring sufficient editing accuracy in the track length direction. When recording a reference signal for tracking outside the recording data area of the video and audio signals (that is, the data track), the recording area of the video and audio signals and the tracking area are formed. In the length direction of the track between the recording reference signal recording areas, a predetermined length of unrecorded track is further recorded, and the tracking reference signal recording area is further recorded. The width direction of the track between the region recorded completely independent area on a recording medium having a track of unrecorded state than the track width.

In addition, as for the tracking reference signal, the tracking reference signal is recorded at the time of all erasing or new recording, but is set to the non-recording state at the time of editing, and control is not performed to erase / update the reference signal. Therefore, by performing tracking based on a plurality of reference signals before and after such a data track, it is possible to perform accurate tracking between tracks and follow pitch deviations. Furthermore, since this reference signal is not deleted / updated during editing,
Since the absolute position of the track at the time of new recording is maintained with high accuracy even after a plurality of edits, it is effective for a large number of edits or an edit with a compatible tape.

In the first place, between the video signal of the field unit which is the minimum editing unit and the audio signal corresponding to the field period which is the minimum editing unit, the non-recorded track having the track width in the track width direction on the recording pattern. Since the format is such that data is recorded by forming a non-recorded track of a predetermined length that can ensure a sufficient editing accuracy in the track length direction, the sum of track bending and pitch deviation is within ± 1/2 track. In this case, even if an erasing head wider than the track width is used at the time of insert editing or assembling editing, the recording track width does not decrease, and the remaining azimuth can be eliminated.

Further, since no data is recorded in the area adjacent to the audio recording sub-track, the S / S due to admixture of adjacent crosstalk in the reproduced audio signal.
It is possible to reproduce a high-performance audio signal without N deterioration. Therefore, in addition to the characteristics of the format, it became possible to perform highly accurate tracking with the reference signal.
The mounting accuracy and adjustment accuracy of the mechanical section and the tape feeding accuracy during editing can be further relaxed, which is particularly effective for narrow track recording and editing.

In this embodiment, the case where the video signal is digitally recorded has been described as an example, but it is clear that the same effect can be obtained when analog recording is performed.

Further, in the present embodiment, the tracking reference signal is recorded at two positions before and after the recording data area (ie, data track) of the video and audio signals. Obviously, the same effect can be obtained by recording. Further, it is apparent that the same effect can be obtained by only recording the tracking reference signal at one or two places for each minimum editing unit of the video and audio signals.

Another embodiment of the present invention will be described below with reference to the drawings. FIG. 3, FIG. 4 and FIG. 5 show recording track pattern diagrams in another embodiment of the present invention.

In the embodiment of FIG. 3, the tracking reference signal is recorded at one location after the recording data area (ie, data track) of the video and audio signals. In FIG. 3, 47 and 49 are non-recorded tracks, 53 to 58 are 37 video recording sub-tracks for recording 1-field video signals, and 48 is 8 per field period.
Audio signals of channels are recorded as audio recording sub-tracks (for example, 51) by separating them into unrecorded tracks (for example, 50) each having a predetermined length in the track length direction.

Reference numeral 52 is a tracking reference signal recording sub-track recorded at one location after the video and audio data tracks by winding the recording medium around a rotating cylinder at an angle of 180 degrees or more of the head.
Indicates an angle division of the head, that is, a recording data area (that is, a data track) length of the video and audio signals recorded within 180 °.

In the embodiment of FIG. 3, the tracking reference signal is recorded at one location after the recording data area (ie, data track) of the video and audio signals.
As shown in the above embodiment, the tracking reference signal may be recorded at one location before the recording data area (that is, the data track) of the video and audio signals.

In FIG. 4, 60 and 62 are non-recorded tracks, 66 to 71 are 37 video recording sub-tracks for recording 1-field video signals, and 61 is 8-channel audio for each 1-field period. This is a track in which a signal is separately recorded as an audio recording sub-track (for example, 64) by an unrecorded track (for example, 63) having a predetermined length in the track length direction.

Reference numeral 65 is a tracking reference signal recording sub-track recorded at one location before the video and audio data tracks by winding the recording medium around a rotary cylinder at an angle of the head (180 °) or more.
This shows the recording data area (ie, data track) length of the video and audio signals recorded within the head angle division, that is, within 180 °.

In addition to the embodiment of FIG. 3 and the embodiment of FIG.
Further, the effect is almost the same even in the recording track pattern as shown in FIG. In the embodiment shown in FIG. 5, the tracking reference signal is recorded at two positions before and after the recording data area (that is, the data track) of the video and audio signals (that is, outside 180 °).

Further, the minimum editing unit of the video signal is the field unit, the audio signal is 8 channels, and the minimum editing unit is the field unit. In order to record the recording medium, the recording medium is wound around the rotating cylinder at an angle division of the head (that is, 180 °) or more, and the rotating cylinder is rotated at a rotation speed of 5 times the frame frequency (that is, 80 recording tracks in one frame period, 1 There are 40 recording tracks in the field period.) And digital recording is performed.

In FIG. 5, 73 to 82 are 40 lines (substantially 36 +
(1/4 track * 4 = 37) video recording sub-tracks, 8-channel audio signals are audio recording sub-tracks (eg, 84), and a track in the non-recording state with a track width of 1 track width in the track width direction. In the depth direction, the data is recorded in an independent area having an unrecorded track (for example, 86) of a predetermined length.

At the same time, the tracking reference signal is used as a tracking reference signal recording sub-track (for example, 85) at two positions before and after the recording data area (ie, data track) of the video and audio signals, and one track in the track width direction. A non-recorded track having a predetermined width in the track length direction is a non-recorded track (for example, 86).
Will be recorded separately. Reference numeral 87 indicates an angle division of the head, that is, a recording data area (data track) length of a video and audio signal recorded within 180 °.

The audio recording sub-track (for example, 84) has a width of 2 tracks, and the audio data of 8 channels is divided into even sample data and odd sample data, which are respectively recorded on adjacent tracks, and are different for each field. It is designed to be written twice with the head.

As a result, even if one of the two heads used for audio recording has a problem, the other head can completely reproduce the data. In addition, since the audio signal recording track is made wider, even if there is a discontinuity in the track center of the audio recording track that occurs when audio insert editing is performed, compared with the case where the recording track width is the same as the video signal. The effect is reduced, and an S / N improvement effect can be expected even during normal reproduction.

However, with respect to the image, if a complete erase band is not provided for each field which is the minimum editing unit and an erasing head wider than the track width is used at the time of editing, two adjacent video signals at the editing point are used. A reduction in track width occurs in one of the video recording sub-tracks of the book (eg 82 and 83). Even in such a format, by inserting a plurality of tracking reference signals, it becomes possible to perform high-accuracy tracking control during playback / editing, so that two adjacent video recording subtracks at the editing point It is possible to suppress the decrease in the track width on one side to a minimum and to make the head width of the erase head close to the track width.

[0040]

As described above, according to the present invention, at all edit points of a video signal and an audio signal on a recording medium, in the track width direction, a track in a non-recorded state having a track width larger than the track width is recorded. When recording a video signal and an audio signal in an independent area having an unrecorded track of a predetermined length in the direction, and recording the tracking reference signal outside the recording data area (that is, the data track) of the video and audio signals. In the track length direction of the track between the video / audio signal recording area and the tracking reference signal recording area, there is a predetermined length of unrecorded track, and the width of the track between the tracking reference signal recording areas. In the direction, recording is performed in a completely independent area on a recording medium having a non-recorded track having a track width or more, and the tracking reference signal is erased even during editing work. / As not updated, by performing tracking based on the reference signal for tracking at the time of reproduction or editing, precise tracking is ensured even in the editing of a plurality of times.

Further, even if there is a track bend or a pitch shift, insert recording or assembly recording can be performed after erasing with an erasing head wider than the track width at the time of editing, so at any editing point of any tape including a compatible tape. The track width does not decrease and the tracks do not remain unerased, and the mounting accuracy and adjustment accuracy of the mechanism section and tape feed accuracy during editing can be further relaxed, ensuring editing performance in narrow track recording. It is possible to provide a magnetic recording / reproducing apparatus that can achieve the above effect.

[Brief description of drawings]

FIG. 1 is a recording track pattern diagram in an embodiment of the present invention.

FIG. 2 is a recording system signal processing block diagram of the magnetic recording / reproducing apparatus in the embodiment.

FIG. 3 is a recording track pattern diagram in the other embodiment.

FIG. 4 is a recording track pattern diagram in the other embodiment.

FIG. 5 is a recording track pattern diagram in the other embodiment.

[Explanation of symbols]

 1, 3 Non-recording track 2 Audio recording track 4 Non-recording track of predetermined length 5 Audio recording sub-track 6 Tracking reference signal recording sub-track 7-12 Video recording sub-track 13 Data recording track 14-16 Y, Pr, Pb Input terminal 17 to 24 8-channel audio signal input terminal 25 Recording system video signal processing circuit 26 Recording system audio signal processing circuit 27 Tracking reference signal generator 28 Signal processing circuit 4 29 Control signal input terminal 30, 32, 34 Signal processing circuit 1 31, 33, 35, 37 Signal processing circuit 2 36 Signal processing circuit 3 38-45 Recording head 46 Recording medium 47, 49 Non-recording track 48 Audio recording track 50 Non-recording track 51 of predetermined length 51 Audio recording sub-track 52 Tracking For reference signal Sub-track 53-58 Video recording sub-track 59 Data recording track 60, 62 Non-recording track 61 Audio recording track 63 Non-recording track of a predetermined length 64 Audio recording sub-track 65 Tracking reference signal recording sub-track 66-71 Video recording sub-track Track 72 Data recording track 73-83 Video recording sub-track 84 Audio recording sub-track 85 Tracking reference signal recording sub-track 86 Non-recording track of predetermined length 87 Data recording track

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Ochi 1006, Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A video signal and M using a rotary head cylinder.
When recording the audio signal of the channel and the K reference signals for tracking (K is a positive integer) on the recording medium for each period, an area for recording the video signal for each first period and the second The portion where the areas for recording the respective audio signals for each period are adjacent to each other in the track width direction is L at the boundary.
The tracks of the book (L is a positive integer) are set in a non-recorded state, and the portions where the regions are adjacent to each other in the track length direction are set in the non-recorded state over a predetermined length of the boundary track, and the respective signals are recorded on the recording medium. When recording the tracking reference signal for each third period outside the recording data area of the video and audio signals while recording in the completely independent area, the video and audio signal recording area and the tracking area are recorded. The portion where the recording reference signal recording area is adjacent to the track length direction is in a non-recording state over a predetermined length of the boundary track, and the portion where the tracking reference signal recording area is adjacent to the track width direction is the boundary. N
This (N is a positive integer) track is recorded as a non-recorded state in a completely independent area on the recording medium, and the K tracking reference signals are not erased and updated even during editing, and are reproduced or A magnetic recording / reproducing apparatus comprising at least means for performing tracking based on the tracking reference signal during editing.