JPH07108029B2 - Recording medium on which video signal is recorded - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a helical scan type V
The present invention relates to a recording medium used in a TR (video tape recorder), and more specifically, a video signal
When the recording density is improved by recording or reproducing for each field signal, for example, four signal recording tracks are divided into four signal recording tracks in equal units on a line-by-line basis, the four signal recordings are performed. Even if, for example, one of the four rotary heads corresponding to the track is clogged by dust or the like and cannot be reproduced, and the signal from the corresponding track is lost, the reproduction screen does not deteriorate so much. As described above, or when the special reproduction such as the double speed reproduction is performed, the present invention relates to the recording medium recorded in the recording signal format so that the reproduction screen does not deteriorate so much.

[0002]

2. Description of the Related Art In a conventional VTR for recording a signal for each field on a plurality of tape tracks, as described in JP-A-57-123778, a plurality of signals for recording one field are divided and recorded. One of the tracks is discriminated as a signal track for special reproduction, only the upper portion of the image sample is recorded here, and only this track is reproduced by a dedicated head during special reproduction. However, during normal reproduction, the signals of all tracks that are divided and recorded are reproduced by using a plurality of heads corresponding to each track.

[0003]

In general, magnetic powder of tape or the like adheres to the magnetic head to cause clogging, which deteriorates the reproduction signal amplitude. When such signal amplitude deterioration occurs, Therefore, the signal quality is greatly damaged. In the signal recording format described in JP-A-57-123778, no consideration is given to maintaining image quality when such a situation occurs,
Therefore, when the head for reproducing the track recorded by collecting the upper portion of the image sample, which is the characteristic thereof, is clogged, there is a problem that the reproduction image quality is greatly deteriorated. Also, in order to perform special reproduction, if a head and a signal reproduction circuit used for normal reproduction are used, the image quality will be greatly deteriorated. Therefore, it is necessary to provide a reproduction head and a signal reproduction circuit dedicated to the head and use this. It was inconvenient in the sense that you had to prepare a special one.

An object of the present invention is to solve the above-mentioned problems of the prior art, and in a helical scan type VTR, when a signal for each one field is divided into a plurality of tracks for recording and reproduction, the tracks are recorded on the tracks. Even if, for example, one head of the corresponding heads is clogged and reproduction becomes impossible, resulting in the loss of a collected signal on one track, the quality of the reproduced image is not significantly deteriorated. It is an object of the present invention to provide a recording medium by a video signal recording / reproducing method that enables special reproduction at various speeds without causing a significant deterioration in image quality without using a dedicated head or a reproducing circuit.

[0005]

A VTR for recording / reproducing an NTSC television signal will be described below. Of course, it is noted in advance that the number of lines in one field and the recording / reproducing system do not affect the essence of the present invention. There are several methods for dividing the video signal for one field into a plurality of signal recording tracks. However, in order to perform special reproduction while the signal recording track is obliquely scanned (helical scan) with an ordinary head without providing a special reproduction dedicated head, for example, in the case of an NTSC system television signal, 262.
It is advantageous to divide the image signal for one field consisting of five horizontal scanning lines (lines) in units of lines for the convenience of reproduction signal processing. By the way, recording is performed line by line on the first signal recording track in sequence from the first line of the 262.5 lines forming one field,
When the track becomes full, the second signal recording track is simply recorded from the next following line.
Consider a case where a signal for a field is divided line by line in line units.

Since the VTR has a high recording / reproducing signal frequency, a head corresponding to each signal recording track is used, and recording / reproducing is often performed by a multi-channel system by such a plurality of heads. In the signal reproduction, the deterioration of the signal S / N directly leads to the deterioration of the reproduced image. Therefore, when one of the plurality of heads is clogged and the reproduction signal S / N from the head is significantly deteriorated, The signal of the track corresponding to that head cannot be reproduced. Therefore, as described above, in the simple signal division method of allocating a signal for one field to a plurality of tracks in a line order by a plurality of lines, when a certain head is clogged, the continuous tracks on the tracks corresponding to the head are generated. You cannot play back multiple lines.

For example, when a signal of one field is divided and recorded on four tracks, if the signal of one track cannot be reproduced, a line corresponding to ¼ of the screen cannot be continuously reproduced, and the one of the screen is not reproduced. / 4 will be collectively missing. Further, since the signal missing position on the screen is fixed at the same position in each field, it is impossible even if an attempt is made to compensate for the missing signal by taking the field correlation or the frame correlation. Therefore, in the present invention, in the same signal recording track, the signals for one field are divided into line units so that lines which are adjacent to each other on the screen (that is, lines in order) are not recorded in each track. Record separately.

[0008]

As a result, even if the head corresponding to a certain track is clogged and the signal recorded on that track is no longer reproduced, the lines that have not been reproduced are mutually separated on the screen of one field. The line will be at a distance. The signals of these non-reproduced lines can be easily supplemented by taking the line correlation using the signals of the normal lines reproduced by the adjacent and non-clogging other heads. It is possible to prevent deterioration of image quality. in this way,
In order to prevent lines that are adjacent to each other on the screen from being recorded on the same signal recording track, when signals of a plurality of lines forming one field are divided and recorded on N tracks, one field is formed. Among the plurality of lines to be recorded, the lines picked up every Nth line from the first line are collectively recorded on the first track, and the lines similarly picked up every Nth line from the second line are collectively recorded to the second line. You can record on the track. Of course, even if such a simple regular division method is not used, for example, if a line on one track is recorded, the next line is recorded on any of the other (N-1) tracks. All you have to do is However, regular signal division is more convenient in terms of hardware configuration.

On the other hand, when special reproduction such as double speed reproduction is performed using an ordinary head, the traveling locus of the reproducing head on the tape is a locus that crosses the track diagonally. Therefore, the head can only reproduce a part of the signal on each track. In particular, when performing integral multiple speed reproduction, reproduction may occur in which among the plurality of tracks in which signals for one field are recorded separately for each field, only the recording signal at the same screen position can be reproduced when viewed for each field. There is speed. Therefore, when performing such special reproduction, even if the above-mentioned signal division is performed, a plurality of continuous lines cannot be reproduced, and a noise band appears on the screen, not to mention line correlation but also field correlation and frame correlation. Since they cannot be obtained, they cannot be used to supplement the missing signal. Of course, the signal division can be performed so that the unreproducible lines are evenly distributed on the screen only for special reproduction using a certain specific speed, but even in that case, changing the reproduction speed has no effect.

Therefore, the relation between the line position on the screen and the recording position on the track is sequentially changed between the fields. Therefore, recording is performed again every N number of tracks from the Nth line on the N number of tracks as the other party for dividing and recording the signal of one field, with the beginning of each field as the reference of division. The division criterion is increased by a predetermined number of lines from the beginning of the field. Of course, as described above, the division method and the increment amount of the division standard may be irregular, but it is still advantageous in terms of hardware configuration.

In order to perform the above signal division, consider a numerical value M that increases by a fixed number for each predetermined field and returns to zero when the value reaches the number of lines forming one field. Then, for each field, the (M-1) th line is arranged in order starting from the (M-1) th line to the last line of the field, and then from the line at the beginning of the field to M
A virtual field in which the lines up to the line are arranged in order is generated. The signal is divided into each track based on this virtual field, and each N track is recorded with every Nth line from the Nth line from the beginning of the virtual field. good. If a recording medium of such a signal division method is used, even if only the signal recorded at the specific position of each track can be reproduced during special reproduction, the line position on the screen of the reproduced signal differs from field to field. Therefore, if the signal of the line that could not be reproduced is retained and used as the signal of the line that was reproduced in the previous field, it is possible to prevent the noise band from being generated on the screen.

[0012]

EXAMPLE An example of the present invention will be described below.
However, before that, refer to the recording mode that facilitates understanding of the present invention.
As a consideration example, description will be given below with reference to FIG. Figure 1 is 1 fee
Split recording format for multiple tracks
FIG. 4 is a schematic diagram showing as a reference example for facilitating the understanding of the embodiment of the present invention . This example is an example when applied to a VTR that records and reproduces a video signal consisting of 525 lines per frame (numbered in the scanning order, line 1, line 2, ... Line 524, line 525). . In this example , a 1-field signal is divided and recorded on 4 tracks. In this example , the lines 524, 525, 1 to 5 and the lines 262 to 262 during the vertical blanking period.
267 is not recorded on the track.

In FIG. 1, 1 to 8 are signal recording tracks. 1A shows the arrangement of signal recording tracks on the tape, and FIG. 1B shows the arrangement of signal lines on each track. Each of the tracks 1 to 8 is shown in FIG.
As indicated by A to D in (a), the signal amounts obtained by dividing the signal for one field into four are recorded in four tracks A to D corresponding to the four tracks respectively recorded. Recording and reproduction are performed by the head. In addition, the numbers shown in the squares in each of the tracks 1 to 8 in FIG. 1B represent the line numbers of the video signal. Signal recording tracks 1 to
8 is obliquely arranged on the tape as shown in FIG. Field N signal is 4 on tracks 1-4
Similarly, the signal of the next field (N + 1) is divided into four tracks 5 to 8 and recorded on the tape. Each signal divided into four is recorded in this order on a corresponding track on the tape by four heads A to D, respectively.

Therefore, tracks 1 and 5 are recorded by A heads, tracks 2 and 6 are recorded by B heads, tracks 3 and 7 are recorded by C heads, and tracks 4 and 8 are recorded by D heads, and signals are reproduced in the same combination during reproduction. It As shown in FIG. 1B, on track 1, lines 10, 14, which are lines extracted every four lines from line 6 of the head line among the signals recorded on the tape in field N, 18, ...
The signals at 254 and 258 are recorded.

Similarly, as shown in FIG. 1 (b),
On track 2, lines 11, 15, 19, ..., 255, 2 which are lines extracted every 4 lines from line 7 which is the second line of the recording signal of field N.
The signal of 59 is a line extracted every four lines from the line 8 which is also the third line on the track 3, the signals of lines 12, 16, 20, ... In the same manner, signals of lines 13, 17, 21, ..., 257, 261 which are lines extracted every four lines from the fourth line, line 9, are recorded.

The signal in field (N + 1) is likewise shown in FIG.
As shown in (b), as lines extracted every four lines, the track 5 has lines 268 to 272, 276, ...
516 and 520, the track 6 has lines 269 to 273, 277, ... 5 as the second line.
17, 521, but track 270 to lines 274, 278, ..., 51 as the third line on track 7.
8, 522, and on track 8 the fourth line from line 271 to line 275, 279, ...
519 and 523 are recorded respectively. Thereafter, in the fields (N + 2) and thereafter, the signals of each field are similarly divided and recorded on every four tracks.

Next, the effect of the video signal recording method shown as a reference example in FIG. 1 will be described with reference to FIG. 2 is shown in FIG.
In the signal splitting method described in (1), of the four reproducing heads, the head that reproduces the track labeled B in FIG. 1A (referred to as B head) is clogged, and the reproducing signal cannot be obtained from this head. It is a figure which shows the video signal (image signal) reproduction | regeneration situation in the case. When the B head is clogged, the signals recorded on the tracks 2 and 6 in FIG. 1 cannot be reproduced at all. In the conventional system in which a continuous signal in the order of signal lines is recorded on each track as a counterpart for dividing and recording a signal of one field,
As described above, due to the clogging of the head, a plurality of continuous lines cannot be reproduced and a noise band is generated on the screen.

However, according to the method of this example , even if the signals on the tracks 2 and 6 in FIG. 1 cannot be reproduced at all, as shown in FIG.
In the field, lines 7, 11, 15, 19, ..., 2
55 and 259, and in the (N + 1) field are lines 269, 273, ... 517 and 521, which are mutually discrete lines. Therefore, the reproduced signal is as shown in FIG. 2 on the screen, and one line out of every four lines becomes a non-reproducible noise signal in each field. Therefore, these unreproducible signal lines can be easily supplemented by the signals of the lines before and after the line correlation of the image signal, and the noise on the screen can be removed. For example, in FIG. 2, the unreproducible line 7 can be replaced by the signal of the preceding line 6 or by the average value of the signal of the line 6 and the signal of the subsequent line 8, Similarly, line 269 of the next field is the signal of line 268 or line 2
It can be easily replaced by the average value of the signal on line 68 and the signal on line 270. Hereinafter, the unreproducible lines such as the shaded lines 11, 15, 273, 277 in FIG. 2 can be easily corrected, and the noise generation on the screen can be suppressed.

In the above-mentioned reference example, when the head is clogged, the reproduction becomes impossible and the position of the corrected signal line on the screen is the same in both odd and even fields (actually, due to interlacing). As shown in FIG. 2, the odd and even fields come to be adjacent to each other). In this example , the position of the line that becomes unreproducible when the head is clogged is odd on the screen and even on the different fields, and the lines to be corrected are scattered so that the visual image quality deteriorates. Can be reduced. This also enables correction by field correlation as well as line correlation.
If necessary, both correlations may be used together for correction to further reduce image quality deterioration. Below, such a raw
An embodiment of the present invention based on the theory will be described with reference to FIG.

FIG. 3 is a schematic diagram showing an example of a format in which a signal of one field is divided and recorded on a plurality of tracks, as an embodiment of the present invention. Also in this embodiment, the video signal (video signal) to be recorded is the same as that of the reference example of FIG.
It is the same.

In FIG. 3, 11 to 18 are signal recording tracks. 3A and 3B show the arrangement of recording signal tracks on the tape and the arrangement of signal lines on each track, as in FIG. Further, as in the reference example of FIG. 1, the signal of one field is divided and recorded on four tracks, and each of the tracks 11 to 18 is A to D as shown by A to D in FIG. Recording and reproduction are performed by the four heads. In addition, each track 11 to 18 in FIG.
The numbers inside the squares represent the line numbers of the image signal, as in FIG. 1 (b). Signal recording tracks 11-
18 is obliquely arranged on the tape as shown in FIG. Field N signals are track 11-1
Similarly, the signal of the next field (N + 1) is divided into four tracks 15 to 18 and recorded on the tape. The four-divided signal corresponds to the recording order of the track on the tape, and is divided into 4 of A to D, respectively.
It is recorded by individual heads. Therefore, track 1
1 and 15 are A, tracks 12 and 16 are B, track 13
Heads C and 17 and tracks 14 and 18 are recorded by the head D, and signals are reproduced in the same combination during reproduction. As shown in FIG. 3B, the signals of the field N are recorded on the tracks 11 to 14 in exactly the same manner as in the reference example of FIG.

On the other hand, on the tracks 15 to 18, the signal of the field (N + 1) is cyclically shifted by one line in the field and then dividedly recorded by the same method as the method of dividing the signals into the tracks 11 to 14. Therefore, as shown in FIG. 3 (b), the track 15 has lines 273, 277, 281, ..., 517, 521 starting from the line 269, and the track 16 has lines 270, 274, 278 ,. ,
518 and 522 have lines 271 and 2 on the track 17.
75,279, ... 519,523, and track 18 has lines 272,276,280, ..., 52.
0 and finally line 268 is recorded respectively.

In the following fields (N + 2) and (N + 3), the recording is divided into four tracks in accordance with the odd / even of the fields, similar to the fields N and (N + 1). In the present embodiment, the fields (N + 1) (N + 3, N +
(5, ... also) is cyclically shifted by one line within the field, but it goes without saying that the number of lines to be shifted can be arbitrarily selected. In addition, the field (N +
1) (same for N + 3, N + 5, ...) Is the same as the reference example of FIG. 1, and field N (same for N + 2, N + 4, ...)
Alternatively, a cyclic shift may be performed in line units, and the same effect is obtained.

Next, the effect of the embodiment of FIG. 3 will be described with reference to FIG. FIG. 4 is a block diagram of the signal division method of FIG.
FIG. 11 is a diagram showing a situation of reproducing an image signal when a B head is clogged out of four reproducing heads D to D and a reproduction signal cannot be obtained from the B head. When the B head is clogged, the signals recorded on the tracks 12 and 16 in FIG. 3 cannot be reproduced. But track 11
Since signals are recorded by dividing the signal lines so that the signal lines are arranged as shown in FIG. 3B in FIGS. 3 to 18, even if the signals of the tracks 12 and 16 cannot be reproduced at all, the unreproducible line is Lines 7, 11, 15, 19, ...
... 255,259,270,274, ... 518,
It becomes 522. Therefore, the reproduced signal is as shown in FIG. 4 on the screen, and the positions of the unreproducible lines on the screen are discrete both in the same field and in the adjacent field. As a result, these unreproducible signal lines can be easily corrected by the signals of the lines before and after it, and the noise on the screen can be removed, and the lines to be corrected are scattered on the screen. Image quality degradation is reduced.

Further, in the case of such signal division, not only the line correlation but also the field correlation can be corrected, so that the image quality can be further improved. In the above description of the embodiments, only the clogging of the head has been described. However, the same applies to the case where the signal of one track cannot be reproduced due to the loss of synchronization when the signal is reproduced from the track. effective.

Next, an embodiment of a signal division method advantageous for special reproduction among the video signal recording methods according to the present invention will be described with reference to FIG. FIG. 5 is a schematic diagram showing a format when a signal of one field is dividedly recorded on a plurality of tracks in consideration of special reproduction and a signal reproduction situation at the double speed reproduction in the present invention. In this example also,
The video signal (video signal) is the same as that in FIG. 1 or FIG.
It is like . In FIG. 5, 21 to 34 are signal recording tracks. Each track is recorded with different azimuth angles between adjacent tracks in order to avoid crosstalk. FIG. 5A shows the arrangement of the signal recording tracks on the tape and the scanning locus of the reproducing head during double speed reproduction.
(B) shows the arrangement of signal lines on each track. Similar to the above-described embodiments, the signal of one field is divided and recorded on four tracks, and each of the tracks 21 to 34 is A to D as shown by A to D in FIG. Recording and reproduction are performed by the four heads. The four heads A to D have two types of azimuth angles, and A and C and B and D have the same azimuth angle. Heads A to D are evenly arranged on the cylinder at an angle of 90 °, and the head scanning loci during double speed reproduction are shown in FIG.
It is as shown by a to d in (a). The numbers inside the squares in each track in FIG.
3B shows the line number of the image signal as in FIG. 3B.

The signal recording tracks 21 to 34 are shown in FIG.
As shown in (a), the tape is obliquely arranged on the tape.
The field N signal is divided into four tracks 21 to 24. Similarly, the next field (N + 1) signal is divided into tracks 25 to 28, and the field (N + 2) signal is divided into tracks 29 to 32. Recorded in. Each track depends on the recording order on the tape,
As shown by A to D in FIG. 5A, recording is performed by four heads A to D, respectively.

As shown in FIG. 5B, the signals of the field N are extracted from the tracks 21 to 24 at the head line of the field and every four lines from the head line, as in the reference example of FIG. The recorded lines are sequentially recorded for each track. Fields (N +
After the signal of 1) is cyclically shifted by one line in the field, it is similarly divided and recorded.

Up to this point, the procedure is similar to that of the previous embodiment shown in FIG. 3, but the following tracks 29 to 32 have a field (N +).
The signal of 2) is cyclically shifted by 2 lines in the field, and then dividedly recorded on each track, and the following tracks 33,
Similarly, for 34 and below, the amount of cyclic shift in each field is increased line by line and recorded separately on each track.

As described above, the signal lines of the respective fields are arranged on the tracks 21 to 34 as shown in FIG. 5B. When double speed special playback is performed, A,
The scanning loci of the four reproducing heads B, C and D are shown in FIG.
As indicated by a, b, c, and d, the tracks 21 to 34 are diagonally crossed. However, when azimuth recording is performed, the signals of tracks recorded by heads with different azimuth angles cannot be reproduced. Therefore, the heads A and C reproduce only the tracks recorded by the heads A and C, and the heads B and D reproduce only the tracks recorded by the heads B and D, and only the signals in the shaded portions in FIG. Is played. Since a signal with a poor S / N and a low signal level is not reproduced correctly, in the double speed reproduction state as shown in FIG. 5A, the signal in the shaded portion in FIG. 5B is a correct image. It cannot be reproduced as a signal and becomes noise.

In such a reproduction pattern, for example, as shown in FIG.
If the line position on the screen and the line recording position on the track are fixed for each field as in the reference example, a noise band occurs at the fixed position on the screen, and correction is also made by line correlation or field or frame correlation. Can not do it.

In the embodiment shown in FIG. 5, however, the positions of the signal lines that can be reproduced for each field on the screen move sequentially, so for lines that could not be reproduced correctly,
Generation of a noise band can be prevented by holding the signals of the same line of the frame reproduced before that or the line of the same position of the field (actually, there is a shift due to interlacing). As described above, in the present embodiment, it is possible to minimize the deterioration of image quality during special reproduction. In the present embodiment, the four heads are evenly arranged on the cylinder at an angle of 90 °, but other heads such as four heads arranged close to each other with a step are provided. Even when the head is in position or in special reproduction at a speed other than double speed, the pattern of the reproduced signal is different, but the effect of preventing noise band generation is similarly obtained.

Also, an example has been described in which one line is used as the increment of the cyclic shift amount of the signal for each field, but any other arbitrary number of lines may be selected or the increment amount of the cyclic shift amount may be changed for each field. However, the same effect can be obtained. Although the present invention has been described above with reference to an example in which one field is divided into four tracks, it goes without saying that the present invention can be similarly applied even if the number of tracks to be divided is another number.

[0034]

According to the present invention, when one field is divided into a plurality of tracks and recorded, a plurality of recording / reproducing heads corresponding to the respective tracks are clogged so that the signals of the tracks can be reproduced. Even if it disappears, it can be easily corrected by using the line correlation of the image signal, and the corrected signal line positions can be dispersed on the screen.
It is effective in improving the playback image quality of TR. Further, even in special reproduction by a normal reproduction head, a reproduction signal capable of correcting a noise band can be obtained by frame correlation or field correlation, which is effective in improving image quality during special reproduction.

[Brief description of drawings]

FIG. 1 is a view for facilitating understanding of an embodiment of the present invention.
It is a schematic diagram which shows a consideration example.

FIG. 2 is an explanatory diagram showing an effect of the reference example shown in FIG.

FIG. 3 is a schematic view showing an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an effect of the embodiment shown in FIG.

FIG. 5 is a schematic view showing another embodiment of the present invention.

[Explanation of symbols]

 1-8, 11-18, 21-34 ... Signal recording tracks.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location H04N 5/783 H H04N 5/782 D Z (72) Inventor Takashi Furihata Yoshida Totsuka-ku, Yokohama-shi, Kanagawa Prefecture 292, Machi, Ltd., Hitachi, Ltd., Home Appliance Research Laboratory (56) References JP-A-58-200413 (JP, A) JP-A-60-22886 (JP, A) JP-A-59-32272 (JP, A)

Claims (2)

[Claims] 1. A recording medium with respect to a running direction of the medium.
On multiple tracks that are diagonally parallel to each other,
A recording medium having a video signal recorded therein, wherein the first N tracks (where N is 2 or more) of the plurality of tracks.
Is an integer greater than or equal to 2 and is an odd number (or even number) in the video signal.
Number) field video signal even on the next N tracks
Record video signal of (or odd number) field respectively
However, this is repeated thereafter, and the video signal of the odd field is recorded on the first N tracks.
1 field, which is an odd field, when
A plurality of horizontal scanning line signals (hereinafter referred to simply as horizontal scanning line signals
Line numbers are given in the scanning order.
And the first track of the N tracks has an odd feel
Identification of all lines that make up one field
Starting from the 1st line, the line extracted every N lines
Recording sequentially, the second track in the N tracks has an odd number
All lines that make up one field, which is a field
Then, start from the 1st line of the number next to the 1st line.
Record the extracted lines for each N lines in order.
This is the third track in the N tracks and subsequent tracks.
Repeat this for the rack and record the even field video signal on the next N tracks.
In this case, the multiple fields that make up one field, which is an even field,
If you assign line numbers to several lines in scanning order,
In the first track of N tracks, an even field
Of all the lines that make up one field,
A line corresponding to the specific one line in several fields.
Another line other than the one line of the in number
Again, a specific line (for convenience, this is an even field
The even field
Starting from one specific line for each line extracted every N lines
Ins are recorded in order, and the second track in the N tracks is recorded.
Is all the fields that make up one field, which is an even field.
Next to the specific one line for the even field of the in
Starting from line 1 with the number
Records in the order, this following, the third in N tracks
Repeat for track and subsequent tracks
The video signal was recorded with all the above recording requirements satisfied.
A recording medium on which a video signal is recorded. 2. A recording medium with respect to a running direction of the medium.
On multiple tracks that are diagonally parallel to each other,
A recording medium in which a video signal is recorded, wherein the video signal is recorded in advance for each signal amount of one field.
Note Every N consecutive tracks in multiple tracks (however,
N is 2 or an integer of 2 or more), and the horizontal scanning line signal unit (hereinafter
Below, horizontal scanning line signal is simply called line)
Recording is performed separately and is recorded on any one of the N tracks.
The video signal of each line unit is
Signals at the same pixel position are on the field screen
Then the signals at pixel positions belonging to lines that are not adjacent to each other
Their recording position on the track, as if they were
Is selected and recorded, and is incremented by a prescribed number each time the prescribed number of fields has passed , and the value
Returns to zero when exceeds the number of lines that make up one field
Add a numerical value to the line number of the first line of each field
The line number obtained by
The line number that preceded it was turned to the end.
To create a virtual field with the line numbers sorted.
It is assumed that the virtual field is added and recorded on the N track.
Should be recorded in equal amounts, and the N track
Each line recorded on any one of the tracks
The unit video signal is the same image from the beginning in the line.
The virtual field screen where the signals in their original positions are
N lines above each other (however, n is an arbitrary integer)
The signals are at pixel positions that belong to distant lines.
Select the recording position on the track to record
The video signal was recorded satisfying all the above recording requirements.
A recording medium on which a video signal is recorded.