JP3521530B2 - Magnetic recording / reproducing 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 magnetic recording / reproducing apparatus, 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.

As a variable speed reproducing method in a conventional magnetic recording / reproducing apparatus, for example, a method disclosed in Japanese Patent Laid-Open No. 2-94071 is known.

In this system, a variable reproduction data area is provided at a position corresponding to a pattern traced by a magnetic head at a certain variable reproduction speed, and still image information extracted from a video signal is arranged in this data area.

FIG. 16 shows the structure of such a magnetic recording / reproducing apparatus. In FIG. 16, 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. Here, the magnetic head 6 includes a magnetic head 6a (R azimuth angle) and a magnetic head 6b (L azimuth angle) having different azimuth angles.

On the cylinder 20 which is inclined with respect to the vertical direction, two azimuth angles different from each other as described above are provided.
The magnetic heads 6a and 6b are mounted adjacent to each other, the magnetic tape 7 is wound around the cylinder 20 by the guide post 21, and is run by the capstan motor 22.
0 at high speed to rotate the magnetic head 6a and the magnetic head 6
Recording and reproduction are performed at b.

FIG. 17 shows a track pattern of a conventional magnetic recording / reproducing apparatus. During recording, the recording tracks 30 are sequentially formed by the magnetic heads 6a and 6b. Here, a variable speed reproduction data area 31 (hatched portion in the figure) is provided at a position corresponding to the pattern traced by the magnetic heads 6a and 6b during variable speed reproduction of one type of standard variable speed reproduction speed (9 [double speed] in FIG. 17). Still image information extracted from the video signal is arranged in this area. For example, the image at the time t is recorded on the track 30, and the still image data at the time t is divided into a plurality of pieces and sequentially recorded in the variable speed reproduction data area 31.

During high speed reproduction, the capstan motor 22
The speed of the magnetic tape 7 is controlled by the pinch roller 23 and the pinch roller 23, the magnetic tape 7 is run at the reference variable speed reproduction speed (9 [double speed]), and the variable speed reproduction data is recorded on the track (track 3).
0) to select the track to be scanned, and by controlling the phase of the magnetic head 6 and the magnetic tape 7, the magnetic heads 6a and 6b scan the variable speed reproduction data area 31 to obtain the still image information. To display the image.

The AUX area is arranged in a part of the normal data area for storing the normal reproduction data.
Information (recording date, time code, etc.) of the recording signal recorded in the normal data area is recorded in the area.

[0010]

However, in the above-described structure, the optimum still image information can be acquired only for one type of variable reproduction speed. However, in the current VTR, only one type of variable speed reproduction speed is not sufficient, and in order to support a plurality of variable speed reproduction speeds in such a conventional method, the head scans at a plurality of variable speed reproduction speeds. There is a problem that it is necessary to arrange data redundantly, the layout of the search data area becomes complicated, and the search data is wasted.

Further, in the conventional method, it is necessary to match the phases of the recording track and the magnetic head and to select the track forming the search data area at the time of variable speed reproduction, and at the time of shifting from the normal reproduction to the variable speed reproduction. It had a problem that it took time.

Further, since the search data is arranged on the scanning locus of the magnetic head, there is little margin for the scanning locus deviation such as track bending, tape speed fluctuation, and cylinder rotation unevenness during variable speed reproduction. I had a problem.

Since the AUX area is arranged in the normal data area, there is a problem that the information in the AUX area cannot be reproduced during variable speed reproduction.

In view of the above problems, the present invention eliminates the need to select a track to be scanned, can reproduce all effective search data even if a scanning locus shift occurs, and achieves high-quality shifts at a plurality of shift playback speeds. It is an object of the present invention to provide a magnetic recording / reproducing device capable of realizing reproduction and reproducing information in the AUX area even during variable speed reproduction.

[0015]

In order to solve the above problems, the magnetic recording / reproducing apparatus of the present invention is mounted on a rotating cylinder.
The attached magnetic heads have different azimuth angles.
Video signals are encoded on tracks on adjacent magnetic tapes
In a magnetic recording / reproducing apparatus for recording / reproducing the recorded data,
Normally encodes video signals to generate normal playback data
Playback encoding means and one or more reference variable playback speeds
Accordingly, search data for variable speed reproduction is sent to the video signal.
Code for each reference variable reproduction speed generated from the number
And recording the normal reproduction data on the track.
A normal data area for recording is provided and the search
The search data area for recording data for
It is provided for each raw speed, and the reference variable reproduction speed is N3 + 0.5.
[Double speed] (however, N3 is an integer) and every other track
Consists of (2 x N3 + 1) or more selected tracks
Of the same track set,
The same search data is recorded in the data area, and
Place the search data area at the same position on the track
Formatter means, recorded on the magnetic tape,
The normal reproduction data and the search data are extracted.
Deformatter means for decoding and decoding the normal reproduction data
Decoding for normal playback by converting to output video signal for normal playback
Conversion means and variable speed reproduction by decoding the search data.
And a search decoding means for outputting a video signal for
When playing N3 + 0.5 [double speed],
By controlling the phase of the head and scanning the head twice
Search data in the search data area of the track set
It is characterized by reproducing the data.

With the above structure, a normal data area used for normal reproduction and one or a plurality of search data areas used for variable speed reproduction are provided in one track, and a reference variable speed reproduction speed is set. The search data areas of the respective track sets are arranged at the same positions on the tracks, and the search data areas of the track sets each have the same data. The phase of the head is controlled, and the data in the search data area of the track group is reproduced by scanning the magnetic head twice.

Further, a search data area is provided on a locus scanned by the magnetic head at a reproduction speed twice as high as the reference variable speed reproduction speed, and the search data is reproduced by two scans of the magnetic head when reproducing at the standard variable speed reproduction speed. It is characterized in that the data in the area is reproduced.

A normal data area used for normal reproduction and one or a plurality of search data areas used for variable speed reproduction are provided in one track, and K tracks selected every other track (K is an integer of 4 or more). ) The search data areas of the track set consisting of the above tracks are arranged at the same positions on the tracks, and the search data areas of the track set each have the same data, and K / W [double speed] (W
Is an integer greater than or equal to 3, and K / W ≠ integer), all the data in the search data area is reproduced by scanning W times.

A normal data area used during normal reproduction and one used during variable speed reproduction in one track.
Alternatively, a plurality of search data areas are provided, and an AUX area is provided in a part of the search data area.

[0020]

The configuration DETAILED DESCRIPTION OF THE INVENTION The present invention as described above, one or more search data areas to be used in the normal data area at the time of variable speed reproduction to be used during normal reproduction in a single track is provided, to set the reference speed playback speed, a plurality the search data regions of the track sets each consisting of tracks arranged in the same position on preparative rack <br/> click, the search data region of the track sets each having the same data, the reference speed Playback
When reproducing at speed, the phase of the track and the magnetic head
The magnetic head is controlled and the track is moved twice by the magnetic head.
To reproduce the data in the search data area of the group
From the search head in the track group.
The target area is scanned exactly twice, so these two scans
All valid data in search data area can be reproduced and should be scanned
Approximately equal to track pitch without selecting tracks
High-quality variable-speed playback can be achieved with a magnetic head with a new head width .

[0021]

Further, a search data area is provided on a locus scanned by the magnetic head at a reproduction speed twice as fast as the reference variable speed reproduction speed, and when the reproduction is performed at the standard variable speed reproduction speed, the search data is scanned twice by the magnetic head. By reproducing the data in the area, even if the track to be scanned is not selected at the reference variable speed reproduction speed and twice the variable speed reproduction speed,
A magnetic head having a head width substantially equal to the track pitch can realize high-quality variable-speed reproduction.

Further, a normal data area used for normal reproduction and one or a plurality of search data areas used for variable speed reproduction are provided in one track, and K tracks selected every other track (K is an integer of 4 or more). ) The search data areas of the track set consisting of the above tracks are arranged at the same positions on the tracks, and the search data areas of the track set each have the same data, and K / W [double speed] (W
Is an integer greater than or equal to 3, and K / W ≠ integer), all the data in the search data area is reproduced by scanning W times, so that all the valid data in the search data area is reproduced at the time of K / W [double speed] reproduction. Even if a magnetic head having a head width substantially equal to the track pitch is used, all effective data in the search data area can be reproduced within W scans without the need to control the phase of the magnetic head and the recording track. Therefore, high-speed variable speed reproduction can be realized and the variable speed reproduction speed range can be increased.

A normal data area used during normal reproduction and one used during variable speed reproduction in one track.
Alternatively, by providing a plurality of search data areas and providing an AUX area in a part of the search data area, the data recorded in the AUX area can be reproduced in both normal reproduction and variable speed reproduction.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic 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 magnetic recording / reproducing apparatus according to an embodiment of the present invention. In FIG.
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, and 9 is error correction. Decoder 10, 10 is a deformatter, 11 is a normal reproduction decoder, 12 is a search decoder, and 13 is a switch. The head arrangement of this embodiment is shown in FIG. Figure 3
In (c), 6a and 6c are magnetic heads having an R azimuth angle, and 6b are magnetic heads having an L azimuth angle. Here, the magnetic heads 6a and 6c are arranged at an angular interval of about 180 degrees, and the head height step with respect to the horizontal plane of the rotary cylinder of the magnetic heads 6a and 6c is substantially zero. Further, the magnetic head 6b may be arranged arbitrarily. For example, in the case of a read-only machine, the magnetic head 6b may be omitted.

The operation of the magnetic recording / reproducing apparatus configured as described above will be described below with reference to FIG. 1, taking the case of the reference variable reproduction speed N1 = 5 [double speed] for the search data area as an example.

At the time of recording, the video signal input obtained by D / A converting the video signal 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 so that an image can be recorded and reproduced with a small amount of data and is output to the formatter 3 as search data.
Here, since the reference variable reproduction speed is N1 = 5 [double speed], the magnetic head 6a has the same azimuth angle N1 = 5.
While recording the search data area of the track set consisting of one track, the search encoder 2 operates on each magnetic head 6a.
Output the same data to.

Here, in order to reduce the width of the search data area, one frame of image data is divided into M pieces. For example, a case where the number of screen divisions M = 2 and the screen is divided into upper and lower parts will be described.

The search encoder 2 receives from the video signal input,
One frame of image data T at a certain time t is extracted, the upper half of this image data T is compressed to create data Ta, and while the magnetic head 6a records one track set, the data Ta is written to the magnetic head 6a. Output. Next, the search encoder 2 compresses the lower half of the image data T to produce data Tb, and while the magnetic head 6a records the next track set,
The data Tb is output to the magnetic head 6a. After the magnetic head 6a records two sets of tracks, the search encoder 2 extracts the latest one frame of image data (T + 1) from the video signal input and compresses the upper half of this image data (T + 1) to obtain the data. (T + 1) a is created and this data (T + 1) a is output to the magnetic head 6a while the magnetic head 6a records the next track set. Such processing is sequentially repeated in the same manner. The amount of data in the upper half of the image and the amount of data in the lower half of the image may be different, and the amount of data in the upper half (lower half) of one image and the amount of data in the upper half (lower half) of another image may be different. Can be different. That is, the length of the search data area in the track direction can be arbitrarily selected according to the amount of data. Also, the screen division number M can be set arbitrarily other than 2. Although the magnetic head 6a is used for recording the search data area, the magnetic head 6c may be used for recording.

The formatter 3 rearranges the normal reproduction data and the search data and outputs them to the error correction encoder 4.
Here, in a track group consisting of N1 tracks having the same azimuth angle and recording the same data, the search data area is recorded at the same position on the track. That is, the search data area is formed as an area parallel to the longitudinal direction of the magnetic tape 7. Further, although the set of tracks forming the search data area is composed of N1 tracks here, it may be composed of N1 or more tracks. Further, the search data area can be arbitrarily arranged in units of a track set consisting of N1 or more tracks. For example, it is possible to open a space between a certain track group and the next track group, and if a sound signal area is secured, it is possible to dispose this sound signal area.

FIG. 2 shows a track pattern of this embodiment. The formatter 3 stores normal reproduction data in the normal data areas shown in areas 100 to 129 and areas 300, 302, ..., 328, and areas 200, 20.
In the search data area indicated by 2, ..., 228, search data of the reference variable reproduction speed N1 is recorded.

In the normal data area, one frame of image data is recorded on 10 tracks. That is, one frame of image data at time t is recorded in the normal data areas 100 to 109 and 300 to 308, and then one frame of image data at time (t + 1) is recorded from the normal data areas 110 to 119 and 310. Record at 318.

On the other hand, N1 = 5 selected every other track
The same data is recorded in the search data area in the track set V composed of the book tracks.

In the search data area, the data Ta obtained by highly compressing the upper half of the image of the image data T of one frame at time t is used as N in the search data areas 200 to 208.
1 = 5 tracks, and then the data Tb obtained by highly compressing the lower half of the image of the image data T is searched data area 2
Recording is performed on N1 = 5 tracks from 10 to 218. Then, one frame of image data (T +
Data (T + 2) a obtained by highly compressing the upper half of the image in 2)
Are recorded on the 5 tracks from the search data area 220 to 228, and the same processing is sequentially repeated. Therefore, when the number of screen divisions is M, the search data area has M × N1.
An image of one frame is arranged on 10 tracks having the same azimuth angle, and the update cycle S of the images recorded in the search data area is S = 2 × M × N1 = 20 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 the normal format data and two types of search data are deformed by the deformatter 10. Divided into data.
The normal reproduction data is decoded by the normal reproduction decoder 11, and 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 at the reference variable reproduction speed.

Next, a method of reproducing the search data area will be described. Here, it is assumed that the gap length (head width Tw) of the magnetic head 6 is equal to the track pitch Tp. Figure 3
(A) is a schematic diagram of a track pattern, (b) is an enlarged view of a search data area, and (c) is a head arrangement. Here, the magnetic head 6 at the time of reproducing N1 (= 5) [double speed]
Scans a and 6c are shown by trajectories 500 and 501. Figure 3
From (a), by controlling the speed of the magnetic tape 7 by the capstan motor 22, the magnetic head 6a having the R azimuth angle for N1 = 5 tracks of the R azimuth angle at the time of 5 [speed] reproduction, 6c always scans the search data area once each. FIG. 3B shows an enlarged view of the search data area in FIG. 3A. Data A obtained by compressing the upper or lower half of the image data T at time t on the track of R azimuth angle in the search data area is shown in FIG. Divide into multiple data groups and record. In the present embodiment, for example, the data A is divided into five data groups (A1, A2, A3, A4, A
Record in 5).

Here, the magnetic head 6a scans the scanning locus 500.
Data group A1 can be reproduced, and the data group A1 can be reproduced by scanning the magnetic head 6c (scan locus 501).
2, A3, A4, A5 can be reproduced. Therefore, all the valid data recorded in the search data area of the track having the same azimuth angle as the magnetic head 6a can be complementarily reproduced by the scanning of the magnetic heads 6a and 6c. By repeating in this way,
Even if the phase of the magnetic head and the recording track is not controlled by the capstan motor 22, all the valid data recorded in the search data area of the track of the R azimuth angle is recorded twice by the magnetic head 6a or the magnetic head 6c. It becomes possible to perform complementary reproduction by scanning. Further, since the search data areas of the track set composed of N1 tracks having the same azimuth angle are arranged in one place on the track and arranged at the same position, the influence of the track bending is less likely to occur.

A case where the gap length (head width Tw) of the magnetic head 6 is larger than the track pitch Tp will be described with reference to FIG. The description here does not depend on the head arrangement and the number of heads. FIG. 4A is a schematic diagram of the track pattern when the head width is larger than the track pitch, and FIG. 4B is an enlarged view of the search data area at this time.

First, assuming that the data recorded on the magnetic tape 7 can be reproduced with a predetermined error rate or less when the magnetic head 6a reproduces an area of more than half of the recording track, when the head width is equal to the track pitch. Is shown in FIG.
From (b), the data group A1 can be reproduced by the scanning locus 500 of the magnetic head 6a, and the scanning of the magnetic head 6c (scanning locus 5).
01), the data groups A2, A3, A4, A5 can be reproduced.

Next, when the head width is larger than the track pitch, as shown in FIGS. 4A and 4B, the data groups A1 and A2 can be reproduced on the scanning locus 500 of the magnetic head 6a, and the scanning of the magnetic head 6c ( Data group A1 in the scanning locus 501),
A2, A3, A4, A5 can be reproduced. Therefore, the data groups A1 and A2 can be reproduced twice, and the magnetic heads 6a,
In a region where the reproduction output of 6c is relatively small, the redundancy of the reproduction data is increased to improve the reliability of the data, and the deviation of the scanning locus of the magnetic head caused by the speed fluctuation of the magnetic tape 7 and the uneven rotation of the cylinder is compensated. You can also do it.

Although the magnetic heads having the same azimuth angle are arranged at angular intervals of about 180 degrees in this embodiment, the phase of the recording track and the magnetic head at the reference variable reproduction speed is described. When one magnetic head and the other magnetic head are displaced by the track pitch, the same effect can be obtained with other head configurations.

In the present embodiment, the variable speed reproduction in the positive direction has been described, but the variable speed reproduction in the negative direction can be similarly realized.

Further, in the present embodiment, the search data area is arranged only in the track of R azimuth angle, but similarly,
A plurality of magnetic heads having an azimuth angle may be provided and the search data area may be arranged in a track having an L azimuth angle.

Further, in this embodiment, one search data area is arranged at one place, but it is also possible to arrange a plurality of search data areas in one track.

Here, the method of dividing the search data area in one track is arbitrary, and the divided search data area may be large or small.

Further, although the search data area is arranged at one reference variable reproduction speed in this embodiment, it is also possible to arrange a plurality of search data areas at a plurality of reference variable reproduction speeds in the same manner as in this embodiment. At this time, the reference variable reproduction speed, the number of tracks constituting the track group, the number of screen divisions, and the size of the search data area can be arbitrarily set in each search data area.

Further, the search data area is composed of N1 tracks selected every other track, but it is redundant, but it may be composed of N1 or more tracks selected every other track.

As described above, a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction are provided in one track, and the reference variable speed reproduction speed is set to N1 (N1 is an odd number) and the same. N with azimuth angle
By recording the same data in each search data area of each track group consisting of one or more tracks, the magnetic head 6a and the magnetic head 6c scan each track group once, and therefore should be scanned. There is no need to select a truck, and the capstan motor 2
Even if there is no 2 phase control, all effective data in the search data area can be reproduced by either complementary scanning by a total of 2 scannings or by scanning of 2 scannings, and high-speed variable speed reproduction is realized. it can.

The reference variable reproduction speed is set to N1 [double speed].
(N1 is an odd number) -N1 [double speed] or more N1
In NX [double speed] reproduction at or below [double speed] (where NX is an odd number), all the search data recorded in the search data area can be reproduced, and the image can be displayed although the image is updated slowly. Furthermore, even in a reproduction speed other than the above or in a transitional state when the reproduction speed shifts, a part of the search data can be reproduced and an image can be displayed.

As the data to be recorded in the search data area, one frame of image data is divided into two parts at the top and bottom of the screen and recorded, but the image data is divided into a direct current component and an alternating current component compressed in the frame, Split into directions,
It is possible to divide into arbitrary blocks, increase the number of divisions, and even not to divide.

Further, the image data recorded in the search data area is the image data of the latest frame at the time of recording the data forming each search data area.
Image data before that can be arbitrarily selected.
For example, when the inter-frame compression technique is used together with the intra-frame compression when generating the normal reproduction data, the search data is extracted from the intra-frame compressed image data before the time when the data forming each search data area is recorded. May be generated and recorded in the search data area.

Further, in the present embodiment, each reference variable reproduction speed is set to N1 (N1 is an odd number), and the same search data area is set for each track group consisting of N1 or more tracks having the same azimuth angle. It is assumed that the data is recorded, but when there are a plurality of magnetic heads having at least one (R azimuth or L azimuth) azimuth angle, and the magnetic heads having different azimuth angles each record a track once in two cylinder revolutions. The reference variable reproduction speed may be set to 2 × NL [double speed] (NL is an odd number), and the track set may be composed of NL tracks having the same azimuth angle. Similarly, when two magnetic heads each having R and L azimuth angles are mounted on the cylinder and two recording tracks having the same azimuth angle are recorded by one rotation of the cylinder, the reference variable reproduction speed is NH / 2 [ Double speed] (NH is an odd number),
The track set may consist of NH tracks having the same azimuth angle. That is, at a certain variable reproduction speed, the same data may be recorded in the search data area of the track having the same azimuth angle in which the magnetic head moves by one rotation of the cylinder. At this time, the phases of the magnetic head and the recording track must be different by at least one track pitch among at least two magnetic heads having the same azimuth angle.

FIG. 5A shows an embodiment in which the search data area of this embodiment is arranged on tracks of both R and L azimuth angles. FIG. 5B shows the head arrangement at this time, and 6a, 6
c is a magnetic head having an R azimuth angle, 6b and 6d are magnetic heads having an L azimuth angle, each magnetic head having the same azimuth angle is arranged at an angular interval of 180 degrees, and the head height with respect to the horizontal plane of the rotating cylinder is set. The step is almost zero.

In FIG. 5A, the reference variable reproduction speed N
1 = 5 [double speed]. In the search data area, time t
Data Ta obtained by highly compressing the upper half of the image of one frame of image data T is recorded in the search data area of the track set V consisting of N1 = 5 tracks having the same azimuth angle (R azimuth angle), and the image data The data Tb obtained by highly compressing the lower half of the image of T is recorded in the search data area of the track set V consisting of N1 = 5 tracks having the same azimuth angle (L azimuth angle), and this is repeated sequentially.

Even with such a data arrangement, as described with reference to FIG. 2, the magnetic heads 6a and 6c are used for the search data area of the track having the R azimuth angle.
All the valid data in the search data area of the track having the R azimuth angle can be reproduced without fail by either one scan of each magnetic head complementarily or a total of two scans. Similarly, with respect to the search data area of the track of L azimuth angle, the magnetic heads 6b and 6d respectively set 1
All the valid data in the search data area of the track having the L azimuth angle can be reproduced without fail by either complementary scanning of two times or scanning of a total of two times. At this time, when the number of screen divisions is M, M × N1 = 1 in the search data area.
An image of one frame is arranged on 0 tracks, and the update cycle of the image recorded in the search data area on the track is S = M × N1 = every 10 tracks, and the image is updated at N1 [double speed] variable speed reproduction. The cycle can be shortened.

As described above, it is possible to form the search data area on the tracks of both R and L azimuth angles.
It is possible to shorten the image update period during variable speed reproduction, increase the data rate of variable speed reproduction data, and improve image quality.

In this embodiment, the same reference variable speed reproduction speed is set for the R azimuth angle search data area and the L azimuth angle search data area, but a separate reference speed variable reproduction speed is set for each search data area. Can be set, and the variable reproduction speed range can be widened.

Further, in the search data area of R azimuth angle and the search data area of L azimuth angle in the track of 2 × N1 or more, the data in both search data areas are updated at the same time for each track group V. In each search data area, the data update position is arbitrary, and the data update position in the R azimuth angle search data area and the data update position in the L azimuth angle search data area may be different.

FIG. 6A shows another embodiment in which the search data area of this embodiment is arranged on the tracks of both R and L azimuth angles. FIG. 6B shows the head arrangement at this time.
a and 6c are R azimuth angle magnetic heads, and 6b and 6d are L
The magnetic heads have an azimuth angle, and the magnetic heads having the same azimuth angle are arranged at angular intervals of 180 degrees, and the magnetic heads (6a, 6b) and the magnetic heads (6c, 6d) are arranged.
Are adjusted in height so as to scan the same position on the magnetic tape.

In FIG. 6A, the reference shift reproduction speed N
2 = 5 [double speed] (N2 is an integer). In the search data area, the data Ta obtained by highly compressing the upper half of the image of the image data T of one frame at time t is recorded in the search data area of the track group V consisting of consecutive N2 = 5 tracks. The data Tb obtained by highly compressing the lower half of the image of T is recorded in the search data area of the next track set V, and this is repeated sequentially.

Even with such a data arrangement, in the N2 = 5 [double speed] reproduction, as in the case described with reference to FIG.
In the track group consisting of N2 = 5 tracks, either the magnetic head (6a, 6b) or the magnetic head (6c, 6d) always scans once, and for example, the magnetic head (6
a, 6b) scans, the magnetic heads 6a and 6 are used for the search data area of N2 = 5 tracks.
By means of b, all the valid data in the search data area can be reproduced without fail by either one scan of each magnetic head complementarily or a total of two scans. The same applies when the set of magnetic heads (6c, 6d) scans.

At this time, when the number of screen divisions is M, an image of one frame is arranged in the search data area with M × N2 = 10 continuous tracks, and the image of the image recorded in the search data area is on the track. Update cycle S = M × N2 =
Every 10 tracks, the image update cycle can be shortened.

As described above, a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction are provided in one track, and each reference variable speed reproduction speed is set to N2 (N2 is an integer). , By recording the same data in each search data area of each track group consisting of consecutive N2 or more tracks, either the magnetic head (6a, 6c) or the magnetic head (6c, 6d) Always scans the track set once, and therefore, even if the phase control of the capstan motor 22 is not performed, either a total of two magnetic heads can be complemented or a total of two magnetic heads can be scanned. By scanning, all effective data in the search data area can be reproduced, the image update cycle is short, and high-speed variable-speed reproduction can be realized.

The second embodiment of the present invention will be described below with reference to the drawings. Here, the block diagram of the magnetic recording / reproducing apparatus in the present embodiment and the normal data area are the same as those in the first embodiment, and therefore their explanations are omitted.

In this embodiment, the reference variable speed reproduction speed is N
3 + 0.5 = 3.5 [double speed] (N3 = 3).

FIG. 7 is a track pattern showing a second embodiment of the present invention. The formatter 3 stores the normal reproduction data in the normal data area of the tracks 400 to 429,
In the first search data area and the second search data area of the tracks 400, 402, ..., 428, the search data of the reference variable reproduction speed N3 + 0.5 = 3.5 [double speed] is recorded. Where 2 × with the same azimuth angle
N3 + 1 = first of track set V consisting of 7 tracks
The same data is recorded in the second search data area. Further, the distance between the center of the first search data area and the center of the second search data area in the track longitudinal direction is equal to the length in the track longitudinal direction where the magnetic head crosses the recording track during N3 + 0.5 [double speed] reproduction. Set to an even multiple. The size of the search data area is N3.
It is smaller than the area where the magnetic head can reproduce the data of the recording track in one track during +0.5 [double speed] reproduction.

In the search data area, data Ta obtained by highly compressing the upper half of the image of the image data T of one frame at time t is 2 × N3 + 1 in the first search data area of tracks 400, 402, ..., 412. = 7 tracks are recorded, and the data Tb obtained by highly compressing the lower half of the image of the image data T is recorded in the second search data area of tracks 400, 402, ..., 412 by 2 × N3 + 1 = 7 tracks. Next, the upper half of the image of the image data (T + 1) of one frame at time (t + 1) is highly compressed data (T +
1) a, and the data (T + 1) b obtained by highly compressing the lower half of the image of the image data (T + 1) are respectively recorded in the tracks 414.
7 tracks are recorded from the first and second search data areas, and such processing is sequentially repeated.

Therefore, when the number of screen divisions is M, one frame image is arranged in the search data area with M / 2 × (2 × N3 + 1) = 7 tracks having the same azimuth angle. The update cycle S of the image recorded on the track is S = 2 × M × (2N3 + 1) = 14 tracks.

Next, a method of reproducing the search data area will be described. Here, it is assumed that the gap length (head width Tw) of the magnetic head 6 is equal to the track pitch Tp. Figure 8
(A) is a schematic diagram of a track pattern, and (b) is a head arrangement. Here, N3 + 0.5 (= 3.5) [double speed]
The scanning of the magnetic head 6a during reproduction is traced 510,
Shown by 11. From FIG. 8A, at the time of reproducing at 3.5 [double speed], the magnetic head 6a is used for the track set V including 2 × N3 + 1 = 7 tracks having the same azimuth angle.
(R azimuth angle) always scans the first and second search data areas twice. Here, in two scans of the magnetic head 6a, the center of the reproduction area (hatched portion in the drawing) where the magnetic head 6a can reproduce the recorded data in the track of the R azimuth angle is the first or second search data area. The distance between the center of the first search data area and the center of the reproduction area for reproducing this area is approximately the center, or between the center of the second search data area and the center of the reproduction area for reproducing this area. The capstan motor 22 controls the phase between the magnetic head 6a and the recording track so that the distance becomes equal to the distance.

The point for locking the phase may be calculated by the tape format, or the optimum point may be searched for by the reproduced signal (for example, the sync block number that can be reproduced). By this phase control, the magnetic head can always scan the approximate center of each search data area. Therefore, the difference between the area in which the magnetic head can reproduce the recording data and the search data area at the time of reproducing N3 + 0.5 [double speed] can be used as a margin for the deviation of the scanning locus of the magnetic head, and this amount is large in the search data area. It is possible to set it arbitrarily. That is, it is possible to set a search data area of an optimum size in consideration of the head width and scanning locus deviation within the area where the magnetic head can reproduce the record data at the time of reproducing N3 + 0.5 [double speed]. Therefore, when there is a deviation in the scanning locus of the magnetic head due to fluctuations in the speed of the magnetic tape 7 or uneven rotation of the cylinder, high-quality variable-speed reproduction can be realized even with a magnetic head having a head width substantially equal to the track pitch.

Further, the reference variable speed reproduction speed is set to N3 + 0.5.
When [double speed] (N3 is an integer),-(N3 + 0.
5) Above (double speed) and above (N3 + 0.5) below (double speed) (N
X + 0.5) [double speed] playback (NX is an integer), the area in which the magnetic head can play the recorded data is N3 + 0.5
[Double speed] Since it becomes larger than during playback, all search data recorded in the search data area can be played back.
The image can be displayed although the image is updated slowly.
Furthermore, even in a reproduction speed other than the above or in a transitional state when the reproduction speed shifts, a part of the search data can be reproduced and an image can be displayed.

It is assumed that the search data area is composed of (2 × N3 + 1) tracks selected every other track, but it is selected every other track although it becomes redundant (2
It is also possible to compose of more than (× N3 + 1) tracks.

As described above, a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction are provided in one track, and each reference variable speed reproduction speed is N3 + 0.5 (N3 is an integer). ), The same data is recorded in each search data area of each track set having (2 × N3 + 1) or more tracks having the same azimuth angle, and the phase is changed by the capstan motor 22 at N3 + 0.5 [double speed]. By performing the control, the magnetic head 6a scans the search data area in the track set twice, so that all the valid data in the search data area can be reproduced by these two scans without selecting the track to be scanned. Even with a magnetic head having a head width substantially equal to the track pitch, high-quality variable-speed reproduction can be realized.

When each magnetic head records a track once by rotating the cylinder twice, the reference variable reproduction speed is set to 2 × NL ′ + 1 [double speed] (NL ′ is an integer) and the track groups have the same azimuth. It may consist of 2 × NL ′ + 1 tracks having corners. That is, the same data may be recorded in the search data area of the track having the same azimuth angle in the recording track where the magnetic head moves by two rotations of the cylinder at a certain variable reproduction speed. However, at this time, the phase of the magnetic head and the recording track must be different by approximately one track pitch for one rotation of the cylinder.

FIG. 9A shows a track pattern in the third embodiment of the present invention, FIG. 9B shows the head arrangement at this time, 6a is a magnetic head of R azimuth angle, and 6b is L. A magnetic head with an azimuth angle. here,
Since the block diagram and the normal data area of this embodiment are the same as those of the first embodiment, their explanations are omitted.

In FIG. 9A, the reference variable reproduction speed (N3 + 0.5) = 5.5 [double speed]. Locus 520
Is a locus scanned by the magnetic head 6a at 2 × N3 = 10 [double speed], and the search data area is arranged on this locus. For example, in this embodiment, search data areas are arranged at three locations (areas 602, 704, and 806) on the locus 520, and these search data areas are set in the track set V composed of (2 × N3 + 1) tracks. First, second, and third search data areas are formed at the same position. The same data is recorded in each track set V in each search data area. Here, the size of each search data area is smaller than the size of the area in which the magnetic head can reproduce the record data during 2 × N3 [double speed] reproduction.

At the time of recording, the image data T of one frame at time t is divided into three, and the data Tc obtained by highly compressing 1/3 of the image is 2 × N3 + 1 = 11 having the same azimuth angle (R azimuth angle). The first search data areas 600, 602, ...
.., 618, 620, and highly compressed 1/3 of the image of the image data T, the second search data areas 700, 702 ,.
8, 720, the data Te obtained by highly compressing the lower third of the image of the image data T is recorded in the third search data areas 800, 802, ..., 818, 820 in the track set V, and Are sequentially repeated.

Next, the time of reproduction will be described. (N3 +
When 0.5) = 5.5 [double speed], the magnetic head 6a always scans twice in the track set V including 2 × N3 + 1 = 11 tracks having the same azimuth angle. here,
In the two scans of the magnetic head 6a, the center of the reproduction area (hatched portion in the drawing) in which the magnetic head 6a can reproduce the recorded data in the track of the R azimuth angle is substantially the center of each search data area. Alternatively, the capstan motor 22 separates the magnetic head 6a from the recording track so that the distance between the center of each search data area and the center of the reproduction area for reproducing the search data area is minimized in the three search data areas. Control the phase. The point for locking the phase may be calculated by the tape format, or the optimum point may be searched for by the reproduced signal (for example, the sync block number that can be reproduced).

Further, since the area in which the magnetic head can reproduce the record data at N3 + 0.5 [double speed] is larger than the area in which the magnetic head can reproduce the record data at 2 × N3 [double speed], the search arranged at three locations is performed. All valid data Tc, Td, Te in the data area can be reproduced without fail. At this time, an image of one frame is arranged in (2 × N3 + 1) = 11 tracks in the search data area, and the update cycle S of the image recorded in the search data area on the track is S = 2 × N3.
+ 1 = every 11 tracks.

Further, even during reproduction of 2 × N3 = 10 [double speed], it is necessary to control the phase between the recording track and the magnetic head, but it is not necessary to select a specific track, and the search data Tc is not required. , Td, Te can all be played,
High-quality replay images can be obtained.

As described above, a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction are provided in one track, and each reference variable speed reproduction speed is N3 + 0.5 (N3 is an integer). ), The same data is recorded in each search data area of each track group consisting of (2 × N3 + 1) or more tracks having the same azimuth angle, and the 2 × N3 [double speed] magnetic head scans the locus. This search data area is located at 2 × N3
By performing phase control with the capstan motor 22 at [double speed] and N3 + 0.5 [double speed], all valid data in the search data area is reproduced at a reproduction speed of 2 × N3 [double speed] and N3 + 0.5 [double speed]. Even if the track to be scanned is not selected, it is possible to realize high-quality variable-speed reproduction at a plurality of speeds with a magnetic head having a head width substantially equal to the track pitch.

Further, the reference variable speed reproduction speed is set to N3 + 0.5.
When [double speed] (N3 is an integer),-(N3 + 0.
5) Above (double speed) and above (N3 + 0.5) below (double speed) (N
(X + 0.5) [double speed] reproduction (Nx is an integer) The area where the magnetic head can reproduce the recorded data is N3 + 0.5.
[Double speed] Since it becomes larger than during playback, all search data recorded in the search data area can be played back.
The image can be displayed although the image is updated slowly.
Furthermore, even in a reproduction speed other than the above or in a transitional state when the reproduction speed shifts, a part of the search data can be reproduced and an image can be displayed.

Note that, when 2 × N3 [double speed] reproduction causes a deviation in the scanning locus of the magnetic head due to track bending or the like, and all the search data cannot be reproduced, the data to be recorded in each search data area is recorded in the track longitudinal direction. By repeatedly recording, the allowable range for scanning locus deviation can be increased. At this time, the data repeated in the longitudinal direction of the track may be a part or all of the data recorded in the search data area. For example, data B is divided into five data groups B in one search data area.
When recording is divided into 1, B2, B3, B4, and B5, the enlarged view of the search data area is as shown in FIG. Here, in one search data area, B5, B1, B2, B3, B4, B5, B1 and part of the data B are repeatedly recorded in the track longitudinal direction. Here, when there is no deviation in the scanning locus, B1, B2, B
Data B can be reproduced in the order of 3, B4 and B5. Further, even when the scanning locus deviates from the original position as shown by the dotted line, all the data B2, B3, B4, B5, B1 and the data B can be reproduced. Therefore, by repeatedly recording a part of the data to be recorded in the search data area, it is possible to increase the margin for the scanning locus deviation. Furthermore, if the search data area can be made large, B1, B2, B3, B4,
The same data B as B1, B2, B3, B4 may be repeatedly recorded a plurality of times.

FIG. 11A shows an embodiment in which the search data area of this embodiment is arranged on tracks of both R and L azimuth angles. FIG. 11B shows the head arrangement at this time.
a is a magnetic head having an R azimuth angle, 6d is a magnetic head having an L azimuth angle, the magnetic heads 6a and 6d are arranged at angular intervals of 180 degrees, and the head height step with respect to the horizontal plane of the rotary cylinder is substantially zero. .

Here, the reference variable speed reproduction speed is N4 = 4 [double speed]. Then, the loci 530 and 531 are (2 × N4
−1) = 7 [double speed] is a locus scanned by each of the magnetic heads 6a and 6d, and a search data area is arranged on this locus. For example, in this embodiment, search data areas are arranged at two locations (areas 602 and 704) on the locus 530,
First and second search data areas are formed at the same positions as these search data areas in a track set V composed of 2 × N4 tracks. The same data is recorded in each track set V in each search data area. Here, the size of each search data area is smaller than the size of the area in which the magnetic head can reproduce the record data during (2 × N4-1) [double speed] reproduction.

Even with such a data arrangement, FIG.
As described above, the magnetic heads 6a and 6c always scan the search data area of the track set V consisting of continuous 2 × N4 tracks one time each, and each of the magnetic heads 6a and 6c reads 1 Complementary or total of 2 scans
All of the valid data in the search data area of the track having the R azimuth angle can be reproduced by any one of the scannings.

As described above, a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction are provided in one track, and each reference variable speed reproduction speed is set to N4 (N4 is an even number). , The same data is recorded in each search data area of each track group consisting of continuous 2 × N4 or more tracks, and (2 × N4−
1) [Double speed] This search data area is arranged on the locus scanned by the magnetic head, and (2 × N4-1) [Double speed] and N
By performing phase control by the capstan motor 22 at 4 [double speed], all valid data in the search data area can be reproduced at the reproduction speed of (2 × N4-1) [double speed] and N4 [double speed] Even if the track to be played is not selected, it is possible to realize high-quality variable-speed reproduction at a plurality of speeds with a magnetic head having a head width substantially equal to the track pitch.

FIG. 12A shows a track pattern in the fourth embodiment of the present invention, FIG. 12B shows the head arrangement at this time, 6a and 6c are magnetic heads with R azimuth angles, and 6b. Is a magnetic head having an L azimuth angle. Here, since the block diagram of the magnetic recording / reproducing apparatus and the normal data area in this embodiment are the same as those in the first embodiment, the description thereof will be omitted.

In FIG. 12A, the reference shift reproduction speed N1 = 5 [double speed]. The locus 540 is 2 × N1 = 10
This is a locus scanned by the magnetic heads 6a and 6c at [double speed], and a search data area is arranged on this locus. For example, in the present embodiment, search data areas are arranged at three locations (areas 602, 704, and 806) on the locus 540, and at the same positions as these search data areas in the track set V consisting of N1 tracks. , First search data areas, second search data areas, and third search data areas, respectively. The same data is recorded in each track set V in each search data area. Here, the head widths of the magnetic heads 6a and 6c are substantially equal to the track pitch, and the size of each search data area is 2 × N1 [double speed] during reproduction.
And 6c are smaller than the size of the area in which the recorded data can be reproduced.

At the time of recording, as in the first embodiment,
The image data T of one frame at time t is divided into three, and the data Tc obtained by highly compressing 1/3 of the image is searched for a track set consisting of N1 = 5 tracks having the same azimuth angle (R azimuth angle). Data areas 600, 602, ...
.., recorded in 608, and 1/3 of the image of the image data T
The highly compressed data Td in the search data area 70
, 708, the data Te obtained by highly compressing the lower third of the image of the image data T is recorded in the search data areas 800, 802, ..., 808, and this is sequentially repeated.

Next, the time of reproduction will be described. N1 = 5
At [double speed], as shown by loci 541 and 542, the magnetic head 6a always scans twice in a track group consisting of N1 = 5 tracks having the same azimuth angle. Further, there is always a phase lock point that scans each of the three search data areas in the track set once by these two scans. Further, since the area in which the magnetic head can reproduce the recording data at N1 [double speed] is larger than the area in which the magnetic head can reproduce the recording data at 2 × N1 [double speed],
Even when a magnetic head having a head width substantially equal to the track pitch is used, all valid data Tc, Td, Te in the search data areas arranged at three locations can be reproduced without fail. At this time, one frame of image is arranged in N1 = 5 tracks in the search data area, and the update cycle S = N1 = 5 tracks on the track of the image recorded in the search data area.

Even when reproducing at 2 × N1 = 10 [double speed], it is necessary to control the phase between the recording track and the magnetic head, but it is not necessary to select the track, and the search data Tc and Td are searched. , Te can be reproduced and high-quality reproduced images can be obtained.

As described above, a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction are provided in one track, and each reference variable speed reproduction speed is set to N1 (N1 is an odd number). , The same data is recorded in each search data area of each track group consisting of N1 or more tracks having the same azimuth angle, and 2 ×
N1 [double speed] This search data area is arranged on the locus scanned by the magnetic head, and phase control is performed by the capstan motor 22 at 2 × N1 [double speed] and N1 [double speed], so that 2 × N1 [double speed]. , N1 [double speed], all effective data in the search data area can be reproduced, and even if the track to be scanned is not selected, a magnetic head having a head width substantially equal to the track pitch can provide high-quality images at a plurality of speeds. Variable speed reproduction can be realized.

Furthermore, the reference variable reproduction speed is set to N1 [double speed].
(N1 is an odd number) -N1 [double speed] or more N1
In NX [double speed] reproduction at or below [double speed] (where NX is an odd number), all the search data recorded in the search data area can be reproduced, and the image can be displayed although the image is updated slowly. Furthermore, even in a reproduction speed other than the above or in a transitional state when the reproduction speed shifts, a part of the search data can be reproduced and an image can be displayed.

By repeating a part or all of the data to be recorded in each search data area in the longitudinal direction of the track, it is possible to increase the allowable range of scanning locus deviation particularly during 2 × N1 [double speed] reproduction. Is the same as in the third embodiment.

Although the search data area is composed of 2 × N1 tracks selected every other track, it is redundant, but may be composed of 2 × N1 tracks or more selected every other track. It is possible.

FIG. 13 shows a track pattern in the fifth embodiment of the present invention, in which the structure and the normal data area of this embodiment are the same as those in the first embodiment.
The search data area is arranged by the same method as the search data area of the second embodiment.

In this embodiment, as shown in FIG.
The same data is arranged in the search data area of the track set V consisting of K = 13 tracks (K is an integer of 4 or more) having the same azimuth angle, and the variable reproduction speed is K / W [double speed] ( W is an integer of 3 or more). Therefore, when the number of screen divisions is M = 2, one frame image is arranged in the search data area with M × K = 26 tracks having the same azimuth angle, and the track of the image recorded in the search data area is arranged. Update cycle S above = 2 x M x K
= 52 every track.

Next, a method of reproducing the search data area will be described. Here, it is assumed that the gap length (head width Tw) of the magnetic head 6 is equal to the track pitch Tp. 14
(A) is a schematic diagram of a track pattern, (b) is a head arrangement, (c) is a diagram showing a phase of a magnetic head. Here, K / W = 13/3 = 4.33 (K = 13, W = 3)
[Double speed] Trajectory 5 for scanning the magnetic head 6a during reproduction
Shown by 50, 551 and 552. From FIG. 14 (a), 4.
K = 1 with the same azimuth angle during 33 [double speed] playback
Even if the phase control of the capstan motor 22 is not performed on the three tracks, the magnetic head 6a always scans the search data area three times.

Here, as shown in FIG. 14 (c), the phase of the recording track of the R azimuth angle and the scanning locus of the magnetic head 6a are shifted by 1/3 track pitch for each scan, so that the magnetic head 6a performs recording. Duplication occurs in the area on the track where data can be played. In other words, when a magnetic head having the same head width and track pitch is used, three scans of the magnetic head 6a with respect to a track on which the same data is recorded relatively cause a 1/3 track pitch overlap in the head width direction. This overlapping width becomes a margin for the deviation of the scanning locus of the magnetic head. Therefore, even if the scanning locus is deviated, all data in the search data area can be reproduced at the time of K / W = 13/3 = 4.33 [double speed] by using the magnetic head having a head width substantially equal to the track pitch. That is, even when there is track bending, magnetic tape speed fluctuation, cylinder rotation unevenness, etc., high-quality variable-speed reproduction can be performed without phase control of the capstan motor 22 by using a magnetic head having a head width substantially equal to the track pitch. realizable.

Further, as in the third embodiment, K / W = N
Even in the case of y + 0.5 [double speed] (Ny is an integer), by controlling the phases of the magnetic head and the recording track, all the data in the search data area can be reproduced, and a reproduced image with high image quality can be obtained. Here, when a magnetic head having a head width larger than the track pitch is used, all the search data can be reproduced only by controlling the speed of the magnetic tape 7.

Furthermore, in the present embodiment, K / W [double speed] reproduction was described for the case of W = 3, but similarly, from K or more (K is an integer of 4 or more) tracks having the same azimuth angle. By recording the same data in the search data area of the track set and arranging it at the same position on the track, KX / W (KX is a positive integer less than or equal to K and W is an integer greater than or equal to 3) is an integer. Otherwise, -K / W [double speed] or higher K /
Even in KX / W [double speed] reproduction at W [double speed] or less, all the search data recorded in the search data area can be reproduced, and the image can be displayed although the image is updated slowly. Furthermore, even in a reproduction speed other than the above or in a transitional state when the reproduction speed shifts, a part of the search data can be reproduced and an image can be displayed.

As described above, a normal data area used for normal reproduction and a plurality of search data areas used for variable speed reproduction are provided in one track, and K tracks having the same azimuth angle (K is an integer of 4 or more). ) By recording the same data in the search data area of the track group consisting of the above tracks and arranging this search data area at the same position on the track, if K / W is not an integer, K / W
[Double speed] All effective data in the search data area can be reproduced at the time of reproduction, and even if a magnetic head having a head width substantially equal to the track pitch is used, the W All valid data in the search data area can be reproduced within one scan, high-speed variable-speed reproduction can be realized, and the variable-speed reproduction speed range can be increased.

As shown in the first embodiment, even when there are two or more magnetic heads having the same azimuth angle, K pieces (K is an integer) having the same azimuth angle as in the present embodiment. By recording the same data in the search data area of the track group consisting of the above tracks, 2
If × K / W is not an integer, all valid data in the search data area can be reproduced by a total of W scans of the magnetic head having the same azimuth angle during 2 × K / W [double speed] reproduction.

FIG. 15 shows a track pattern in the sixth embodiment of the present invention. Since the structure of this embodiment and the normal data area and the search data area are the same as those in the first embodiment, the description thereof will be omitted. To do.

First, at the time of recording, an AUX area is provided in a part of the search data area, and a track having no search data area is located at the same position on the track as the AUX area formed in a part of the search data area. Provide an AUX area. In this AUX area, information about the recording format (for example, recording mode), information about the signal recorded in the normal data area (for example, packet size,
Recording date and time, elapsed time, etc.) and information regarding signals recorded in the search data area (for example, the number of tracks on which the same data in the search data area is recorded, reference variable reproduction speed, etc.) are recorded. Of course, these pieces of information may be encoded and recorded, or may be recorded as they are.
Also, these pieces of information are N1 = 5 having the same azimuth angle.
It is not always necessary to record the same information in a track set made up of books. For example, the recording date and time is the same for all tracks in one software, but the elapsed time may be different for all tracks.

Next, at the time of normal reproduction, the magnetic head traces on the recording track, so that all the information recorded in the AUX area can be reproduced.

Further, since the AUX area is arranged in the search data area even during N1 [double speed] reproduction, A
Information recorded in the UX area can be reproduced.

As described above, the AU is set in the search data area.
By arranging the X area, the data recorded in the AUX area can be reproduced in both normal reproduction and variable speed reproduction.

Although the present embodiment has one search data area in the tape longitudinal direction, the search data area may have any structure, and there may be a plurality of search data areas in the tape longitudinal direction or variable speed reproduction. Even when the search data area is formed on the scanning locus of the magnetic head at the speed, the same effect can be obtained by forming the AUX area in a part of the search data area. When arranging a plurality of search data areas for a plurality of variable reproduction speeds, an AUX area may be arranged in a part of the plurality of search data areas. For example, when arranging search data areas for different variable reproduction speeds on tracks of both R and L azimuth angles, A is set in the search data areas of both R and L azimuth angles.
If the UX region is formed, AUX can be performed at these variable playback speeds.
You can get area information. Further, if the AUX area is formed at a position where these search data areas overlap in the track longitudinal direction, the AUX area can be always set at a constant position in the track longitudinal direction, and the AUX area can be easily found.

Further, although the position of the AUX area is recorded on all tracks, it may be recorded every several tracks.

If the magnetic tape 7 has a control track for recording a control signal in the longitudinal direction of the tape, the control signal is recorded at the boundary of the track set V as schematically shown in the control track of FIG. By modulating, the break of the track group can be detected by the control signal, the track group can be easily discriminated, and the track group can be protected at the time of editing such as joint shooting. Further, when the method of arranging the search data on the scanning locus of the magnetic head as described in the conventional example is also used in the track set V, the track to be scanned for reproducing the search data is selected. By defining the position with respect to the start track of the track set V, the delimitation of the track set becomes clear by the modulated control signal, so that the track to be scanned can be easily identified. Here, the modulation method of the control signal is arbitrary, and for example, when the cue function at the time of search is realized by the control signal, different modulation may be performed.
Further, in the case of having a plurality of search data areas having different numbers of tracks constituting a track set, the control signal is modulated into a plurality of types, and the types of the search data areas are different from each other with respect to the partition of the track set. Modulation may be used.

In the above-described embodiments, the data recorded in the normal data area and the search data area are described as image data, but they may be image data, audio data, and additional information such as time code. Furthermore, although the data to be placed in multiple search data areas is different,
By arranging the same data, data redundancy can be increased and errors can be reduced.

Further, the number of divisions of the screen can be arbitrarily determined, and the number of divisions may be variable with the track set or the search data area as a unit. Further, in the above embodiment, the one-frame screen is divided and then compressed, but it may be compressed and then divided, or may not be compressed.

In each search data area, the reference variable reproduction speed, the image update position, the compression method, and the compression ratio are arbitrary, and an optimum variable reproduction image can be obtained at a plurality of reference variable reproduction speeds.

In the above embodiment, the number of tracks for recording one frame of image data at a certain time is fixed in the normal data area and the search data area. However, variable length coding is performed and one frame is recorded. The number of tracks and the size of the recording area may be variable.

[0118]

Magnetic recording and reproducing apparatus of the present invention as described above, according to the present invention, the one or more search data areas to be used in the normal data area at the time of variable speed reproduction to be used during normal reproduction in a single track is provided, the reference speed Set playback speed , multiple
The search data for each track set consisting of
Place over data area at the same position on the track, the search data region of the track sets each have the same data
However, when playing back at the standard variable speed playback,
Control the phase of the magnetic head to scan the magnetic head twice.
By the data of the search data area of the track set
By reproducing the
Since the search data area in the group is scanned exactly twice,
All valid data in the search data area is reproduced by scanning twice
You can do this without having to select the track to scan.
With a magnetic head having a head width substantially equal to the pitch, it is possible to realize high-quality variable-speed reproduction.

[0119]

Furthermore, a search data area is provided on the locus scanned by the magnetic head at a reproduction speed which is approximately twice the reference variable reproduction speed, and the search is performed by scanning the magnetic head twice when reproducing the reference variable reproduction speed. By reproducing the data in the data area, a high quality image can be obtained with the magnetic head having a head width substantially equal to the track pitch without selecting the track to be scanned at the reference variable speed reproduction speed and the variable speed reproduction speed that is approximately twice the standard variable speed reproduction speed. Variable speed reproduction can be realized.

Further, a normal data area used for normal reproduction and one or a plurality of search data areas used for variable speed reproduction are provided in one track, and K tracks selected every other track (K is an integer of 4 or more). ) The search data areas of the track set consisting of the above tracks are arranged at the same positions on the tracks, and the search data areas of the track set each have the same data, and K / W [double speed] (W
Is an integer greater than or equal to 3, and K / W ≠ integer), all the data in the search data area is reproduced by scanning W times, so that all the valid data in the search data area is reproduced at the time of K / W [double speed] reproduction. Even if a magnetic head having a head width substantially equal to the track pitch is used, all effective data in the search data area can be reproduced within W scans without the need to control the phase of the magnetic head and the recording track. Therefore, high-speed variable speed reproduction can be realized and the variable speed reproduction speed range can be increased.

The normal data area used during normal reproduction and the one used during variable speed reproduction in one track.
Alternatively, by providing a plurality of search data areas and providing an AUX area in a part of the search data area, the data recorded in the AUX area can be reproduced in both normal reproduction and variable speed reproduction.

Furthermore, a normal data area used during normal reproduction and one used during variable speed reproduction in one track.
Alternatively, a plurality of search data areas are provided, and the search data areas of a track group consisting of a plurality of tracks selected every other track are arranged at the same position on the tracks.
The search data areas of the track sets each have the same data, and the track sets can be easily detected by indicating the boundaries of the track sets with the control signal.

[Brief description of drawings]

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

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

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

4A is a schematic diagram of a track pattern when the head width is larger than the track pitch in the first embodiment of the present invention, and FIG. 4B is an enlarged view of the search data area in FIG. 4A.

FIG. 5 (a) is a diagram showing a track pattern in the case where the search data area is arranged on the tracks of both R and L azimuth angles in the first embodiment of the present invention. FIG. 5 (b) is the first embodiment of the present invention. FIG. 6 is a diagram showing a head arrangement when the search data area is arranged on tracks of both R and L azimuth angles in the embodiment.

FIG. 6A is a diagram showing a track pattern of a second example in which the search data area is arranged on tracks of both R and L azimuth angles in the first embodiment of the present invention, and FIG. 6B is a diagram of the present invention. The figure which shows the head arrangement of the 2nd example which arranged the search data area in the track of both R and L azimuth angles in the 1st Example.

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

FIG. 8A is a schematic view of a track pattern in the second embodiment of the present invention, and FIG. 8B is a view showing a head arrangement in the second embodiment of the present invention.

9A is a diagram showing a track pattern in the third embodiment of the present invention, and FIG. 9B is a diagram showing a head arrangement in the third embodiment of the present invention.

FIG. 10 is an explanatory diagram when the search data is repeated in the longitudinal direction of the track.

FIG. 11A shows a track pattern when the search data area is arranged on both R and L azimuth tracks in the third embodiment of the present invention. FIG. 11B is a third embodiment of the present invention. FIG. 3 is a diagram showing a head arrangement when the search data area is arranged on both R and L azimuth tracks in the example.

FIG. 12A shows a track pattern in a fourth embodiment of the present invention, and FIG. 12B shows a head arrangement in a fourth embodiment of the present invention.

FIG. 13 is a diagram showing a track pattern in a fifth embodiment of the present invention.

14A is a schematic diagram of a track pattern in a fifth embodiment of the present invention, FIG. 14B is a diagram showing a head arrangement in a fifth embodiment of the present invention, and FIG. 14C is a fifth view of the present invention. Explanatory drawing of the phase of the magnetic head in an Example.

FIG. 15 is a diagram showing a track pattern in a sixth embodiment of the present invention.

FIG. 16A is a top view of a conventional magnetic recording / reproducing apparatus. (B) is a side view of a conventional magnetic recording / reproducing apparatus.

FIG. 17 is a diagram showing a track pattern in a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

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

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Takeuchi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Masaaki Kobayashi 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (56) References JP-A-8-214252 (JP, A) JP-A-8-163498 (JP, A) JP-A-7-274106 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/76-5/956 G11B 20/10-20/12

Claims (10)

(57) [Claims] 1. A magnetic head mounted on a rotating cylinder, wherein adjacent magnetic tables having different azimuth angles are provided.
In a magnetic recording / reproducing apparatus that records and reproduces data in which a video signal is encoded on a track on a track, a normal reproduction data is generated by encoding the video signal
The variable speed reproduction is performed corresponding to the reproduction encoding means and one or more reference variable speed reproduction speeds.
To search for the reference data from the video signal.
Encoding means for searching generated for each raw speed and a recording means for recording the normal reproduction data on the track.
A search area data is provided with a round data area.
Search data area to be recorded for each of the reference variable speed playback speed
Provide the above-mentioned reference variable playback speed N3 + 0.5 [double speed]
(However, N3 is an integer), and a track composed of (2 × N3 + 1) or more tracks selected every other track.
Group, the search data area of the same track group
The same search data is recorded in the
Formatter that arranges the data area at the same position on the track
Data and the normal reproduction data recorded on the magnetic tape.
And a deformatter means for extracting the search data
And decoding the normal reproduction data to obtain a normal reproduction video signal.
For normal reproduction, which outputs a signal, and a video signal for variable speed reproduction by decoding the search data.
Outputs a and a search for the decoding means, N3 + 0.5 [speed] during playback two scans <br/> the result the track sets of the magnetic head by controlling the phase of the magnetic head and the track Sir of the search data area of
A magnetic recording / reproducing device characterized by reproducing data for recording. 2. A 2 × N3 [speed] magnetic recording reproducing apparatus according to claim 1, wherein the providing the search data region on the locus where the magnetic head scans at the time of reproduction. 3. The formatter means sets the reference variable speed reproduction speed to N1 [double speed] ( where N1 is an odd number) and 1
It is composed of N1 or more track selected every other track
Of the same track set , the same search data is recorded in the search data area of the same track set , and
Place search data area at the same position on the track
Then, N1 [speed] playback the track and two scans to thus <br/> search for data <br/> of the track sets of the search data area of the control the phase of the magnetic head and the magnetic head to the The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus reproduces the data. 4. A 2 × N1 [speed] magnetic recording reproducing apparatus according to claim 3, wherein the providing the search data region on the locus where the magnetic head scans at the time of reproduction. 5. The formatter means sets the reference variable speed reproduction speed to N4 [double speed] (where N4 is an even number), and is composed of continuous (2 × N4) or more tracks.
In the track group , the same search data is recorded in the search data area of the same track group , and the search
The data area is located at the same position on the track, N4 [speed] playback the track and two scans to thus <br/> the track sets of the of the magnetic head by controlling the phase of the magnetic head in magnetic recording and reproducing apparatus according to claim 1, wherein the reproducing the search for data <br/> data search data region. 6. (2 × N4-1) [speed] magnetic recording reproducing apparatus according to claim 5, wherein the providing the search data region on the track to the <br/> magnetic head scanning during playback . 7. The formatter means comprises K or more tracks (K is an integer of 4 or more) selected every other track.
In the track group consisting of, before the same track group
The same search data is recorded in the search data area.
And, and the search data region placed at the same position on the track, K / W [speed] (W is an integer of 3 or more, K / W ≠ integer) re
When live, the track is scanned by W times of the head.
Magnetic recording and reproducing apparatus according to claim 1, wherein the reproducing the set of search data of the search data area. 8. A magnetic head mounted on a rotating cylinder, and adjacent magnetic tables having different azimuth angles from each other.
Data recorded on the upper track
In a live magnetic recording / reproducing apparatus, a video signal is usually encoded to generate normal reproduction data.
Playback encoding means and search data for variable speed playback are generated from the video signal.
Encoding means for searching, and a recording means for recording the normal reproduction data on the track.
A search area data is provided with a round data area.
A search data area is provided, and an AUX area is provided in a part of the search data area to record the AUX data.
Formatter means and the normal reproduction data recorded on the magnetic tape
And the search data and the AUX data are extracted.
The deformatter means and the video signal for normal reproduction by decoding the normal reproduction data.
For normal reproduction, which outputs a signal, and a video signal for variable speed reproduction by decoding the search data.
A magnetic recording / reproducing apparatus having a search decoding means for outputting 9. The magnetic recording / reproducing according to claim 1 , wherein a part or all of the search data is repeatedly recorded in the search data area in the longitudinal direction of the track. apparatus. 10. A magnetic recording / reproducing apparatus according to claim 1 , wherein a control signal is recorded / reproduced in the longitudinal direction of the tape, and a boundary of the track group is indicated by the control signal.