JP3407386B2 - Recording and playback device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording / reproducing information signals on a recording medium, and more particularly to a digital VTR.

[0002]

2. Description of the Related Art In recent years, a VTR by digital recording has been developed in order to improve image quality deterioration due to dubbing. An example of the above-described conventional recording / reproducing apparatus will be described below with reference to the drawings.

FIG. 10 is a block diagram of a conventional recording / reproducing apparatus. In FIG. 10, 1 is a normal reproduction encoder, 4 is an error correction encoder, 5 is a modulator, 6 is a magnetic head, 7 is a magnetic tape, 8 is a demodulator, 9 is an error correction decoder, and 11 is a normal reproduction. It is a decoder for.

The operation of the conventional recording / reproducing apparatus configured as described above will be described below with reference to FIG.

First, at the time of recording, the video signal input is
It is input to the normal reproduction encoder 1. Normal playback encoder 1
Outputs the normal reproduction data to the error correction encoder 4 by compressing the image data. This data is added with a code for error correction by the error correction encoder 4, further modulated by the modulator 5, and recorded on the magnetic tape 7 by the magnetic head 6.

During reproduction, the data on the magnetic tape 7 is reproduced by the magnetic head 6, demodulated by the demodulator 8, further error-corrected by the error correction demodulator 9, and input to the normal reproduction decoder 11. To be done. This data is expanded by the normal reproduction demodulator 11 and output as a video signal.

FIG. 10 shows the structure of a conventional recording / reproducing apparatus. In FIG. 10, 6 is a magnetic head, 7 is a magnetic tape, 20 is a cylinder, 21 is a guide post, 22
Is a capstan motor, and 23 is a pinch roller.

Two magnetic heads 6 having azimuth angles different from each other are mounted at 180 ° opposite positions on a cylinder 20 which is inclined with respect to the vertical direction, and a magnetic tape 7 is wound around the cylinder 20 by a guide post 21 and capped. The stun motor 22 is caused to travel and the cylinder 20 is rotated at a high speed, and the magnetic head 6 performs recording / reproduction.

FIG. 11 shows the track pattern recorded in this way, and in FIG. 11, 30 is a recording track.

In the variable speed reproduction, the speed of the magnetic tape 7 is changed by the capstan motor 22 and the pinch roller 23,
Further, the rotation speed of the cylinder 20 is changed to correct the relative speeds of the magnetic tape 7 and the magnetic head 6 to realize it.

A locus 40 schematically shows the locus of the magnetic head 6 at 4 × speed. Trajectory 40 during variable speed reproduction
When a plurality of tracks are traversed and the azimuth angle of the magnetic head 6 and the traversed track are the same, it is possible to reproduce the data in the traversed portion (hatched portion in FIG. 11).

[0012]

However, the above-described structure has a problem that all the recorded data cannot be reproduced during variable speed reproduction, resulting in poor image quality.

In view of the above problems, it is an object of the present invention to provide a recording / reproducing apparatus that realizes excellent image quality during variable speed reproduction.

[0014]

In order to solve the above problems, the recording / reproducing apparatus of the present invention has a normal data area used for normal reproduction in one track and one or more normal data areas used for variable speed reproduction. A search data area is provided, the reference reproduction speed N [double speed] is set to an even number, and the search data area of a track set consisting of (2 × N) tracks is arranged at the same position on the track, The feature is that the same data is recorded in the search data area.

Further, a plurality of reference reproduction speeds (N1, N2 ...
Ni) [double speed] is an even number, and there is a search data area for each reference reproduction speed, and each search data area has (2 × N1, 2 × N2 ... 2 × Ni) tracks. Each of the track groups consisting of 1 to 3 has the same data and is arranged at the same position on the track.

Further, the present invention is characterized in that high-speed search data used during high-speed reproduction is arranged in the normal data area of a specific track on a tape which is intermittently selected.

Data is arranged in the first area on the tape which is commonly scanned by the magnetic head during variable speed reproduction of a plurality of speeds, and the magnetic head is operated only at at least one of the plurality of speeds. Data is also recorded in a second area to be scanned, first basic data is arranged in the first area, and second basic data is arranged in the second area. To do.

[0018]

According to the present invention, the variable speed reproduction having excellent image quality is achieved by reproducing the data recorded in the search data area, the high speed search data area, the first area and the second area during the variable speed reproduction by the above-mentioned structure. Can be realized.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A recording / reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a normal reproduction encoder, 2 is a search encoder, 3 is a formatter, 4 is an error correction encoder, 5 is a modulator, 6 is a magnetic head, 7 is a magnetic tape, 8 is a demodulator, 9 is an error correction decoder, 10 is a deformatter, 11 is a decoder for normal reproduction,
Reference numeral 12 is a search decoder, and 13 is a switch.

The operation of the recording / reproducing apparatus configured as described above will be described below with reference to FIG. 1 by taking the reference speed N = 4 [double speed] as an example.

At the time of recording, the video signal input is input to the normal reproduction encoder 1 and the search encoder 2. The normal reproduction encoder 1 compresses the image data as necessary, or outputs the normal reproduction data to the formatter 3 as it is. The search encoder 2 compresses the video input to a higher degree than the normal reproduction encoder 1 to enable reproduction of an image with a small number of data and output it to the formatter 3 as search data. Then, the standard reproduction speed N = 4
Since the speed is double, the search encoder 2 outputs the same data while recording 2 × N = 8 tracks (track group). Here, in order to reduce the search data area, a case will be described in which the image data of one frame is divided into the upper and lower parts of the screen. In the search encoder 2, first, one frame of image data is extracted from the video signal input, the upper half of this image data is further compressed, and this data is output while the magnetic head 6 records one track group. To do. The lower half of the image data is then compressed and this data is output during the recording of the next trap set. Of course, the data amount of the upper half image data and the data amount of the lower half image data may be different.

The formatter 3 rearranges the normal reproduction data and the search data and outputs them to the error correction encoder 4.
Here, the search data area for recording the search data is recorded at the same position on the track in 2 × N = 8 tracks made of the same data. That is, the search data area is formed as an area parallel to the magnetic tape 7. Further, the search data area can be arbitrarily arranged in units of 2 × N = 8 tracks (track group). For example, when the audio signal area is secured,
This audio signal area can be arranged avoiding.

Of course, when the recording rate of the recording / reproducing apparatus is equal to or larger than the signal rate of the video signal input, the normal reproducing encoder 1 and the normal reproducing decoder 11 are used.
You don't have to.

FIG. 2 shows a track pattern of the first embodiment. Formatter 3 has areas 100 through 12
0 and normal reproduction data are recorded in the normal data areas indicated by 0 and areas 300 to 320, and variable speed reproduction data are recorded in the search data areas indicated by areas 200 to 220.

In the normal data area, one frame of image data is recorded on 10 tracks. on the other hand,
In the search data area, one frame of image data is highly compressed and recorded on 2 × N = 8 tracks.

That is, one frame of image data at time T is recorded in the normal data areas 100 to 109 and 300 to 309, and then one frame of image data at time (T + 1) is recorded in the normal data areas 110 to 119.
And 310 to 319.

In the search data area, 1 at time T
Data Ta obtained by highly compressing the image of the upper half of the frame is recorded in the search data area 200, and the same data as this data Ta is recorded up to the search data area 207. Next, data Tb obtained by highly compressing the image of the lower half of one frame at time T is recorded from search data areas 208 to 215, and this is repeated in sequence. Therefore, in the search data area, one frame image is arranged with 2 × 2 × N = 16 tracks.

Next, reproduction will be described with reference to FIG. The recorded data on the magnetic tape 7 is reproduced by the magnetic head 6, demodulated by the demodulator 8 and error-corrected by the error correction decoder 9, and then converted into normal reproduction data and search data by the deformatter 10. Be divided. The normal reproduction data is decoded by the normal reproduction decoder 11,
The search data is decoded by the search decoder 12. The switch 13 selects the output of the normal reproduction decoder 11 during normal reproduction and the output of the search decoder 12 during variable speed reproduction.

FIG. 3A is a schematic diagram of a track pattern,
(B) is an enlarged view of the search data area.

A locus 400 shows the scanning of the magnetic head 6 at the time of reproduction at 4 × speed. From FIG. 3, the capstan motor 2
2 × N = 8 at 4 × speed reproduction without 2 phase control
Magnetic heads with different azimuths for book tracks
Always scans the search data area once,
It is possible to reproduce all the data of the upper half of one frame recorded in the search data area. By repeating the sequence in this manner, all the data recorded in the search data area can be reproduced.

As described above, a normal data area used for normal reproduction and a search data area used for variable speed reproduction are provided in one track, and the reference reproduction speed N is an even number, and (2 × N) tracks are provided. By recording the same data in the search data area of the track set consisting of, it is possible to complementarily reproduce all the data in the search data area by the magnetic heads 6 having different azimuth angles in N-speed reproduction, which is excellent in image quality. Variable speed reproduction can be realized.

Further, search data can be obtained and an image can be displayed even at a reproduction speed equal to or lower than the reference reproduction speed N or in a transitional state when the reproduction speed is changed. Particularly, at a reproduction speed of N / 2 times or less, all the data in the search data area can be reproduced.

Further, in the present embodiment, the search data area is arranged at the same position for all tracks, but it can be arranged freely in units of 2 × N tracks, for example, it is determined as a standard. It is possible to avoid a specific area such as a voice area in which the sound is played.

The second embodiment of the present invention will be described below with reference to the drawings. A case where the second embodiment has two reference reproduction speeds will be described. Here, the reference reproduction speed Ni (i = 1,2) is N1 = 4 [double speed], N
2 = 16 [double speed]. Also, the reference reproduction speed N1 = 4
Since the above is the same as that of the first embodiment, the description thereof will be omitted.

FIG. 4 is a block diagram of a recording / reproducing apparatus showing a second embodiment of the present invention. In FIG. 4, 14 is a high-speed search encoder, and 15 is a high-speed search decoder, which is used when the reference reproduction speed N2 = 16 [double speed].

The recording / reproducing apparatus configured as described above will be described below with reference to FIG. At the time of recording, the high-speed search encoder 14 takes in a video signal input, performs higher compression than the search encoder 2, and enables an image to be reproduced with a smaller number of data, and a high-speed search to the formatter 3. Output as data for use. At this time, since the standard reproduction speed N2 is 8 times, the high-speed search encoder 14 uses 2 × N2 = 32 tracks (track group).
While recording, the same data is output. Here, a case will be described in which the image data of one frame is divided into, for example, two in order to reduce the search data area. In the high-speed search encoder 14, first, one frame of image data is extracted from the video signal input, and the upper half of this image data is compressed, and this data is recorded while the magnetic head 6 records one track group. Output. Next, the lower half of the image data is compressed, and this data is output while the magnetic head 6 records the next track set. Of course, the data amount of the upper half image data and the data amount of the lower half image data may be different.

The formatter 3 rearranges the normal reproduction data, the search data and the high speed search data and outputs them to the error correction encoder 4. This data is recorded on the magnetic tape 7 through the modulator 5 and the magnetic head 6. here,
There are two search data areas that record the same search data.
For a track of × N1 = 8, a high-speed search data area for recording the same high-speed search data is 2 × N
For 2 = 32 tracks (track set), they are recorded at the same position on the track. That is, the search data area and the high speed search data area are formed as areas parallel to the magnetic tape 7. The search data area and the high-speed search data area are 2 × N1 = 8 and 2 × N2, respectively.
= 32 tracks can be arbitrarily arranged in a unit. For example, when an audio signal area is secured, this audio signal area can be arranged in a different position.

FIG. 5 shows a track pattern of the second embodiment. In the high speed search data area, the data obtained by highly compressing the image of the upper half of one frame at time T is recorded in the high speed search data area 500, and the same data as this data is recorded up to the high speed search data area 531. Next, data obtained by highly compressing the image of the lower half of one frame at time T is recorded from search data areas 532 to 563, and this is sequentially repeated.

Next, the reproducing operation will be described with reference to FIG. The recorded data on the magnetic tape 7 is reproduced by the magnetic head 6, processed by the demodulator 8 and the error correction decoder 9, and then reproduced for normal reproduction by the deformatter 10.
It is divided into search data and high-speed search data, and the high-speed search data is decoded by the high-speed search decoder 15. The switch 13 outputs the output of the decoder 11 for normal reproduction during normal reproduction, the output of the decoder 12 for search during variable speed reproduction of N1 double speed or less, and the decoder 15 for high speed search when the reproduction speed is higher than N1 double speed. Select the output of. Here, according to the variable reproduction speed, use the data of the area that can obtain the largest amount of data in the search data area and the high-speed search data area, or configure the image using the data of both areas. Is also possible.

FIG. 6 is an enlarged view of the high speed search data area of FIG. Magnetic head 6 at 16x speed reproduction
Of the scan is shown by trajectory 410. From FIG. 3, even if the phase control of the capstan motor 22 is not performed, the 2
Since the magnetic heads 6 having different azimuths always scan the search data area once for each of × N2 tracks (track group), it is necessary to reproduce all the upper half data of one frame recorded in the search data area. Is possible. Therefore, all the data recorded in the search data area can be reproduced, and variable speed reproduction with excellent image quality can be realized.

Further, the data in the high speed search data area is set to 4
It is possible to play back at a speed less than double speed, but the image update cycle becomes slow. Therefore, by providing a data area for high-speed search separately from that for search,
In both the high-speed search and the relatively low-speed search, the image update cycle is appropriate, and variable speed reproduction with excellent image quality can be performed.

Here, the high-speed search encoder 14 is different from the search encoder 2, but the same encoder may also be used. In this case, the compression rate of the high-speed search data is the same as that of the search data. The same applies to the high-speed search decoder 15 and the search decoder 12.

Further, by arranging the direct current component of the data obtained by compressing the image data by discrete cosine transform in the high speed search data area and the AC component of the data in the search data area, the image quality is improved during high speed variable speed reproduction. It is possible to further reduce the image quality and further improve the image quality at a reproduction speed close to 1 × speed reproduction.

It is also possible to set the reference reproduction speeds in the search area and the high-speed search data area to be the same, and to arrange the same data in these areas. By doing so, the redundancy is increased and the error of the data is increased. Can be reduced.

The third embodiment of the present invention will be described below with reference to the drawings. A case where the reference reproduction speed N1 = 4 and the ultra-high speed reproduction speed K = 64 will be described as an example. Here, the block diagram of the recording / reproducing apparatus showing the present embodiment is the same as that of FIG. 4, and when the variable speed reproducing speed is 4 times or less, it is the same as that of the first embodiment, and the explanation thereof is omitted.

FIG. 7 is a track pattern diagram of a recording / reproducing apparatus showing a third embodiment of the present invention.

At the time of recording, the ultra-high speed search data area uses a normal data area of two tracks (pair tracks) which are adjacent to each other and have different azimuth angles. However, here, the ultra-high speed search data area is formed at every track interval Q = K / 2 = 32 and is an area having a length equal to or more than half of the track length, and the same data is recorded on two pair tracks.

Here, the normal data areas 100 and 1
01 is used as the ultra-high speed search data areas 600 and 601, an image of one frame at time T is highly compressed in the ultra-high speed search data area 600, and this data is divided into a plurality of minute block data and recorded. Here, the length of this block data is set to a size that ensures that the data can be obtained even at the 64-times speed. The first block data D1 of this block data is used as the ultra high speed search data areas 600 and 6
01, and also in the track 132, the ultra-high speed search data areas 632 and 6 with the block data D1.
Fill 33. Next, the ultra-high speed search data areas 664 and 665 are filled with the second block data D2, and this is sequentially repeated.

At this time, the normal reproduction data is arranged in a region other than the ultra high speed search data area, and the image data of one frame is not always recorded on 10 tracks. In particular, in the case of image data in which intra-frame compressed data and inter-frame compressed data are mixed, the number of tracks on which image data is recorded per frame is not constant.

Next, the time of reproduction will be described. FIG. 8 is a schematic view of the track pattern of this embodiment.

The locus 420 shows the scanning of the magnetic head 6 during the 64 × speed reproduction. From FIG. 3, since the magnetic heads 6 having different azimuths scan the ultra high speed search data area once for K = 64 tracks at the time of 64 × speed reproduction, the track interval Q = 32 tracks are recorded every time. The valid data in the high speed search data area can be reproduced without fail. By repeating this step by step, all the effective data recorded in the ultra high speed search data area can be reproduced, and variable speed reproduction with excellent image quality can be realized.

FIG. 9 shows how the magnetic head 6 crosses a track. Here, 600 is a track, 601 is a scanning locus of the magnetic head 6 at 64 × speed, 6
02 and 603 are reproduction outputs of the magnetic head 6. In the normal data area of the track 600, the block data D1 having the same content is recorded multiple times. Further, the block data D1 is composed of a plurality of data groups (d0 to d3). Here, when the magnetic head 6 scans along a scanning locus 601, if the reproduction output of the magnetic head 6 can be used as data until it becomes 1/2, then d0, d1, d
All data of 2 and d3 can be acquired. In addition, the magnetic head 6
Even if the scanning locus of No. is shifted to the right in the drawing, the reproduction output of the magnetic head 6 is d0, d1, d
All the data of 2 and d3 can be acquired, and all the block data D1 can be reproduced. Therefore, when the variable speed reproduction speed is K = 64 times, all data can be reproduced without the phase control of the capstan motor 22. At this time, if the data obtained by dividing one frame of image data into 100 is arranged in one block data, 50 × 2 × Q = 3,200 tracks will be 1
You can configure the screen.

Although it is possible to reproduce the data in the ultra-high speed search data area at a speed of K = 64 times or less, the image update cycle becomes slow. Therefore,
By providing a data area for ultra-high-speed search separately from search, it is possible to perform variable-speed playback with excellent image quality with an appropriate image update cycle for both extremely high-speed searches and relatively low-speed searches. Becomes

In this embodiment, the ultra-high speed search data area is formed every Q = K / 2 = 32 track cycles when the reference reproduction speed K = 64. However, when the image update cycle may be lengthened. , The ultra high speed search data area having the same data at Q track intervals may be configured to have the number of duplications m = 2 or more in the P track period. Further, when forming an ultra high speed search data area having the same number of duplications m ≧ 3, one of these intervals is set to the Q track interval and the other intervals are set to different intervals from the Q track. The reproduction speed at which variable speed reproduction is possible can be increased. By forming the ultra-high-speed search data area in the P track cycle in this manner, the area on the track used in the high-speed search data area can be reduced, and this area can be reduced less than the normal data area.

Further, when the number of duplications m = 2, if the ultra-high speed search data area can be ½ or more of the track length, all data can be acquired even at the reproduction speed of the reference reproduction speed K or more. That is, assuming that the track length is 1 and the length of the ultra-high speed search data area is X (X ≦ 1/2), at this time, all the valid data in the ultra-high speed search data area is obtained without the phase control of the capstan motor 22. Playable playback speed range V
During forward variable speed reproduction: Q / (X + Y) + 1 ≦ V ≦ Q /
(1-X + Y) Negative direction variable speed reproduction: -Q / (X + Y) -1≤V≤-Q
/ (1-X + Y) However, Y = 0, 1, 2, ..., And all valid data in the ultra-high speed search data area can be reproduced in all velocity ranges V existing for each Y.

Similarly, when the number of times of copying is m ≧ 3, during forward variable speed reproduction: Qi / (X + Y) + 1 ≦ Vi ≦ Q
i / (1-X + Y) Negative direction variable speed reproduction: -Qi / (X + Y) -1≤Vi≤-
Qi / (1-X + Y) However, Y = 0, 1, 2, ..., And the track interval Qi
Is all intervals of m ultra-high speed search data areas,
All the valid data in the ultra-high speed search data area can be reproduced without the phase control of the capstan motor 22 for the entire reproduction speed range Vi for all the track intervals Qi. For example, when m = 3, there are three types of track intervals Qi, Q1, Q2, and Q3, and the reproduction speed ranges V1 and V for each of them.
2. All valid data in the ultra high speed search data area can be reproduced in all V3.

Further, in the present embodiment, the ultra-high speed search data area is provided in the paired tracks having different azimuth angles. However, when the phase control of the capstan motor 22 is possible, one of the azimuth angles is searched for in the search data only. All that is required is to provide a region.

Although the present embodiment has been described with reference to the example in which the ultra-high speed search data area and the search data area are provided, the high speed search data area as described in the second embodiment (FIG. 5) may be combined. As a result, the variable speed reproduction range can be further expanded.

Therefore, in this embodiment, very high speed variable speed reproduction is possible, and high quality variable speed reproduction can be realized even at a relatively low speed.

The fourth embodiment of the present invention will be described below with reference to the drawings. Here, in this embodiment,
With respect to the search data area, the reference reproduction speed N1 = 4, which is the same as in the first embodiment, and therefore its explanation is omitted.

FIG. 10 is a track pattern showing a fourth embodiment of the present invention. In FIG. 10, the scanning locus of the magnetic head 6 during 3 × speed reproduction, 404 is the scanning locus of the magnetic head 6 during 9 × speed reproduction, and 700 is the first scanning line of the magnetic head 6 during 3 × speed reproduction and 9 × speed reproduction. Area, 701
Is a second area scanned by the magnetic head 6 during 3 × speed reproduction. Here, the phase control of the capstan motor is performed in the 3 × speed reproduction and the 9 × speed reproduction. Further, first basic data is placed in the first area 700, second basic data is placed in the second area 701, and first area 7 is placed.
00 and the second area 702 are collectively referred to as an intermittent data area. . Here, the internal DC component of the data obtained by compressing the image data by discrete cosine transform in the first area 700 is
In the area 701, the inner low frequency component of the AC component of the data is recorded.

Therefore, at the time of 3 × speed reproduction, the first area 7
00 and the data of the second area 701 can be acquired, and
During 9 × speed reproduction, the data in the first area 700 can be obtained, and a high quality reproduced image can be obtained. Further, the data in the search data area can be obtained during the 2 × speed and the 4 × speed reproduction, and the variable speed reproduction range is expanded.

In this embodiment, the variable speed reproduction speed is set to the odd multiple speed, but it may be set to the even multiple speed. At this time, the DC component of the data obtained by compressing the image data by the discrete cosine transform in the search data area is used. , The first low-frequency component of the AC component of the data in the first region 700, the second region 70
By recording the inner high frequency component of the AC component of the data in 1, it is possible to further improve the image quality during variable speed reproduction. Further, when the reproduction speed is an even multiple speed, by placing the same data on adjacent pair tracks having different azimuth angles from each other, the amount of data that can be acquired during variable speed reproduction can be increased and the image quality can be improved.

The first area 700 and the second area 701 are not limited to the areas shown in FIG. 10. If the magnetic head 6 commonly scans at a plurality of variable reproduction speeds, the magnetic field may be changed. It may be placed anywhere on the tape 7.

Although the locus of scanning by the magnetic head 6 varies depending on the number and arrangement of the magnetic heads 6 and the like, the first region and the region in which the magnetic head 6 commonly scans at a plurality of reproduction speeds are correspondingly changed. The second area may be arranged.

Further, although only one area is scanned at at least one variable speed reproduction speed, in a system having three or more variable speed reproduction speeds, an area commonly scanned at two kinds of variable speed reproduction speeds is used. It is also easy to provide an area or the like that is commonly scanned at various types of variable reproduction speeds.

The fifth embodiment of the present invention will be described below with reference to the drawings. FIG. 11 is a tape pattern showing a fifth embodiment of the present invention. However, the shaded areas in the figure are all pair tracks. In FIG. 11, the reference reproduction speeds in the search data area and the high-speed search data area are N1 = 4 and N2 = 8, respectively, and the same data is recorded in 2 × N1 = 8 tracks in the search data area. In the data area, the same data is recorded on 2 × N2 = 16 tracks.

The ultra high speed search data area is composed of a pair of tracks having a length equal to or more than ½ of the track length, and the same data is recorded in m = 2 ultra high speed search data areas with a track interval Q = 32. , P = 160 track cycles. Here, when the length of the ultra high speed search data area is 1/2 of the track length, the ultra high speed reproduction speed K = 2 × Q =
However, when the ultra-high speed search data area is longer than ½ of the track length, the ultra-high speed reproduction speed range in which all data can be acquired can be widened (see Embodiment 4). By arranging m ultra-high speed search data areas having a P track cycle and Q track intervals, the recording code length can be shortened while the image data update cycle is lengthened.

Further, at the time of variable speed reproduction (4 × speed reproduction and 8 × speed reproduction) of a plurality of speeds, first basic data is stored in the first area scanned by the magnetic head 6 at least one kind of speed (4 × speed reproduction). 2) basic data is secondly arranged in the second area scanned by the magnetic head 6. Where the first
The intermittent data area consisting of the area 2 and the second area is composed of two tracks (pair tracks) having a track interval R = 8 and different azimuth angles, and the same data is recorded at the same position on each track. .

Here, the DC component of the data obtained by compressing the image data by the discrete cosine transform is applied to the search data region, the low frequency AC component is assigned to the high speed search data region, and the DC component is assigned to the ultra high speed search data region. Of the flow component in the first area, and the inner high frequency component of the AC component in the second area. By arranging such data, redundancy is increased and data errors are reduced.

As described above, by forming the search area, the high speed search area, the ultra high speed search area, and the intermittent data area, it is possible to realize the variable speed reproduction with excellent image quality.

In the above five embodiments, the normal reproduction encoder 1, the search encoder 2 and the high speed search encoder 1 are used.
Although 4 is different, it is also possible to use them together.

In the search data and the high-speed search data, one frame of image data is divided into upper and lower parts and recorded. However, the image data is divided into a direct current component and an alternating current component compressed in the frame, or divided in the horizontal direction. It is also possible not to divide.

Further, the image data recorded in the search data area, the high speed search data area, the ultra high speed search data area, and the intermittent data area are the image data of the latest frame at the time of recording the data forming each area. But,
Image data before that can be arbitrarily selected.

The data to be recorded in the normal data area, the search data area, the high speed search data area, the ultra high speed search data area, the first area and the second area has been described as image data. Further, additional information such as a time code may be used. Furthermore, the data to be placed in these areas is the DC component of the image data compressed by discrete cosine transform, the low frequency component of the AC component, the high frequency component of the AC component, etc., but there is no need to limit to these data. It is possible to put arbitrary data.

Although the variable speed reproduction speed is set to the positive direction, the variable speed reproduction in the negative direction can be similarly realized.

[0078]

As described above, the recording / reproducing apparatus of the present invention is
A normal data area used for normal reproduction and one or more search data areas used for variable speed reproduction are provided in one track, and the reference reproduction speed N [double speed] is set to an even number (2
× N) The search data area of a track set consisting of a number of tracks is arranged at the same position on the track, and the same data is recorded in the search data area of the track set, whereby N-speed variable speed reproduction is performed. Sometimes it is possible to obtain the data in the search data area without fail, and the variable speed reproduction with excellent image quality can be realized by the data arranged in the search data area.

Further, a plurality of reference reproduction speeds (N1, N2 ...
Ni) has a search data area for [double speed], and each of the search data areas is (2 × N1, 2 × N2 ... 2)
XNi) Since the track sets each including the same track have the same data and are arranged at the same position on the tracks, variable speed reproduction with excellent image quality can be realized even at a plurality of variable speed reproduction speeds. .

By recording the ultra-high-speed search data used during ultra-high-speed playback in an area that is half or more of the track length of a specific track on the tape that is intermittently selected, variable-speed playback with high image quality is achieved even during ultra-high-speed playback. realizable.

By arranging m (m ≧ 2) ultra high speed search data areas within the P track period (P is an integer),
Although the image update cycle is delayed, the ultra-high speed search data area on the track can be reduced.

Since the track intervals of m (m ≧ 3) high speed search data areas having the same data and existing in the P track period are all different, the ultra high speed search data can be obtained without the capstan phase control. The playback speed range in which all valid data of the area can be acquired becomes large.

By using the search data area and the ultra high speed data area in combination, variable speed reproduction with high image quality can be realized even at a relatively low speed and a very high speed.

By using the search data area and the intermittent data area in combination, it is possible to improve the image quality during variable speed reproduction and widen the reproduction speed range.

By using the search data area, the ultra-high speed data area and the intermittent data area in combination, it is possible to further widen the reproduction speed range and further improve the image quality during variable speed reproduction.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a track pattern diagram in the first embodiment of the present invention.

FIG. 3A is a schematic diagram of a track pattern in the first embodiment of the present invention, and FIG. 3B is an enlarged view of a search data area in the first embodiment of the present invention.

FIG. 4 is a block diagram of a recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 5 is a track pattern diagram in the second embodiment of the present invention.

FIG. 6A is a schematic view of a track pattern in the second embodiment of the present invention, and FIG. 6B is an enlarged view of a search data area in the second embodiment of the present invention.

FIG. 7 is a track pattern diagram in the third embodiment of the present invention.

FIG. 8 is a schematic diagram of a track pattern according to a third embodiment of the present invention.

FIG. 9 is an enlarged view of a track pattern according to a third embodiment of the present invention.

FIG. 10 is a schematic diagram of a track pattern according to a fourth embodiment of the present invention.

FIG. 11 is a schematic diagram of a track pattern according to a fifth embodiment of the present invention.

FIG. 12 is a block diagram of a conventional recording / reproducing apparatus.

FIG. 13A is a top view of a conventional recording / reproducing apparatus. (B) is a side view of a conventional recording / reproducing apparatus.

FIG. 14 is a track pattern diagram in the second embodiment of the present invention.

[Explanation of symbols]

1 Normal playback encoder 2 Search encoder 3 formatter 4 Error correction encoder 5 modulator 6 magnetic head 7 magnetic tape 8 demodulator 9 Error correction decoder 10 deformatter 11 Normal playback decoder 12 Search Decoder 13 switch

Front page continuation (72) Inventor Akira Iketani 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Akihiro Takeuchi 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72 ) Inventor Masazumi Yamada 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yasuo Hamamoto 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Chiyoko Matsumi Osaka 1006 Kadoma, Kadoma City, Fuchu, Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-5-41035 (JP, A) JP-A-4-318783 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/76-5/956 G11B 20/10-20/12

Claims (13)

(57) [Claims] 1. A recording / reproducing apparatus for sequentially recording and reproducing tracks by a head mounted on a rotary cylinder, and a normal data area used during normal reproduction and one or more searches used during variable speed reproduction in one track. A data area is provided and the reference playback speed N [double speed] is an even number,
It is characterized in that the search data area of a track set consisting of continuous (2 × N) tracks is arranged at the same position on the track, and the same data is recorded in the search data area of the track set. Recording / playback device. 2. A recording / reproducing apparatus for sequentially recording / reproducing tracks by means of a head mounted on a rotary cylinder, and a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction in one track. Is provided, and a plurality of reference reproduction speeds (N1, N2 ... N
i) [Double speed] is an even number, and the search data area is provided for each of the reference reproduction speeds, and each search data area is continuous (2 × N1, 2 × N2 ... 2 × Ni).
A recording / reproducing apparatus having the same data in a track set made up of books and arranged at the same position on the track. 3. A recording / reproducing apparatus for sequentially recording / reproducing tracks by means of a head mounted on a rotary cylinder, wherein the track length of a specific track on a tape for which ultra-high speed search data used during ultra-high speed reproduction is intermittently selected. Recording / playback device that records in the high-speed search data area of more than half
A location, it different for intermittently selected azimuth angle to one another
In the high-speed search data area of the pair track
A recording / reproducing apparatus having high-speed search data arranged therein. 4. A recording / reproducing apparatus for sequentially recording / reproducing tracks by means of a head mounted on a rotary cylinder, wherein an ultrahigh-speed search data area is provided in an area of half or more of the track length of a specific track on a tape selected intermittently. 4. The recording / reproducing apparatus according to claim 3 , wherein the same ultra high speed search data is recorded in m (m ≧ 2) ultra high speed search data areas within a P track (P is an integer) cycle. . 5. At an ultra-high speed reproduction speed K [double speed], m (m ≧ m) having the same data and existing in a P track cycle.
2) number of at least one ultra-high-speed search data area track spacing of claim wherein at least one of the magnetic head during K speed reproduction wherein at most super high speed search data regions capable of scanning the distance 4 The recording / reproducing apparatus described. 6. The recording / reproducing apparatus according to claim 5, wherein the track intervals of m (m ≧ 3) ultra high speed search data areas having the same data and existing in a P track period are all different. . 7. An ultra-high-speed reproduction is characterized in that the length of data that can be acquired when a head crosses a track is used as a reference, and the data is repeatedly arranged on a specific track in units of the length less than the reference. recording reproducing apparatus according to any one of claims 3-6 for. 8. A recording / reproducing apparatus for sequentially recording and reproducing tracks by a head mounted on a rotary cylinder, and a normal data area used for normal reproduction and one or more searches used for variable speed reproduction in one track. A data area is provided and the reference playback speed N [double speed] is an even number,
The search data area of a track set consisting of (2 × N) tracks is arranged at the same position on the track, and the same data is recorded in the search data area of the track set, which is used during ultra-high speed reproduction. A recording / reproducing apparatus characterized in that the data for ultra-high speed search is recorded in an area of half or more of the track length of a specific track on a tape selected intermittently. 9. A recording / reproducing apparatus for sequentially recording / reproducing tracks by a head mounted on a rotary cylinder, and a normal data area used for normal reproduction and one or more searches used for variable speed reproduction in one track. A data area is provided and the reference playback speed N [double speed] is an even number,
The search data area of a track set consisting of (2 × N) tracks is arranged at the same position on the track, the same data is recorded in the search data area of the track set, and a plurality of speed shifts are performed. The data is arranged in the first area on the tape which is commonly scanned by the magnetic head during reproduction, and the data is also written in the second area which is scanned by the magnetic head only at at least one of the plurality of speeds. A recording / reproducing apparatus in which first basic data is recorded in the first area and second basic data is arranged in the second area. 10. A recording / reproducing apparatus for sequentially recording / reproducing tracks by means of a head mounted on a rotary cylinder, and a normal data area used for normal reproduction in one track and one or more searches used for variable speed reproduction. A data area is provided and the reference playback speed N [double speed] is an even number,
The search data area of a track set consisting of (2 × N) tracks is arranged at the same position on the track, the same data is recorded in the search data area of the track set, and a plurality of speed shifts are performed. The data is arranged in the first area on the tape which is commonly scanned by the magnetic head during reproduction, and the data is also written in the second area which is scanned by the magnetic head only at at least one of the plurality of speeds. The first basic data is recorded in the first area and the second basic data is arranged in the second area, and the ultra-high-speed search data used during ultra-high-speed reproduction is intermittently recorded. A recording / reproducing apparatus characterized in that the recording is performed in an area which is half or more of a track length of a specific track on the tape which has been selectively selected. 11. A recording / reproducing apparatus for sequentially recording / reproducing tracks by means of a head mounted on a rotating cylinder, and a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction in one track. Is provided, and a plurality of reference reproduction speeds (N1, N2 ... N
i) [Double speed] is an even number, and the search data area is provided for each of the reference reproduction speeds, and each search data area is continuous (2 × N1, 2 × N2 ... 2 × Ni).
A first area on the tape which has the same data in each track group consisting of a plurality of tracks, is arranged at the same position on the track, and is commonly scanned by the magnetic head during variable speed reproduction at a plurality of speeds. Data is recorded in a second area scanned by the magnetic head only at at least one speed of the plurality of speeds, and the first basic data is recorded in the first area. And a second basic data is arranged in the second area. 12. A recording / reproducing apparatus for sequentially recording / reproducing tracks by means of a head mounted on a rotary cylinder, and a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction in one track. Is provided, and a plurality of reference reproduction speeds (N1, N2 ... N
i) [Double speed] is an even number, and the search data area is provided for each of the reference reproduction speeds, and each search data area is continuous (2 × N1, 2 × N2 ... 2 × Ni).
A first area on the tape which has the same data in each track group consisting of a plurality of tracks, is arranged at the same position on the track, and is commonly scanned by the magnetic head during variable speed reproduction at a plurality of speeds. Data is recorded in a second area scanned by the magnetic head only at at least one speed of the plurality of speeds, and the first basic data is recorded in the first area. The second basic data is arranged in the second area, and the area of more than half of the track length of the specific track on the tape on which the ultra-high-speed search data used at the ultra-high-speed reproduction is intermittently selected. A recording / reproducing apparatus characterized by being recorded on. 13. A recording / reproducing apparatus for sequentially recording / reproducing tracks by a head mounted on a rotary cylinder, wherein a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction in one track. Is provided and a plurality of reference reproduction speeds (N1, N2 ...
2 × Ni) [double speed] is an even number, and the search data area is provided for each of the reference reproduction speeds, and each search data area is continuous (2 × N1, 2 × N2 ... 2).
XNi) on a tape which has the same data in each track group and is arranged at the same position on the track, and which has intermittently selected ultra-high-speed search data to be used during ultra-high-speed reproduction. The recording / reproducing apparatus is characterized in that the recording is performed in an area of at least half the track length of the specific track.