JPS6252997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording and reproducing device for PAL and SECAM color television signals, which enables long-time recording, reduces adjacent signal interference of color signals, and is capable of static reproduction, slow motion reproduction, The structure is such that normal color reproduction can be performed even during special reproduction such as high-speed reproduction and reverse reproduction.

In recent years, there has been a trend toward higher density in home VCRs.
In a two-head helical scan VTR, a recording method in which the two heads are provided with an azimuth angle and no guard band is provided between adjacent tracks has become common.

Figure 1 shows the VHS system for PAL and SECAM signals.
Shows the recording pattern of a VTR. In Figure 1,
-A, -B, -A, -B, ... represent recording tracks, -A, -A, -A, ...
is the trajectory written by head A, -B, -B,
-B, . . . are loci drawn by the B head, and an azimuth angle of ±6° is provided between the A head and the B head (not shown in the figure). Also, -1,
-2, -3, . . . represent line numbers, and the appended R and B represent the color signals of the lines. In other words, for PAL signals, R-
Although the phase of the Y signal is inverted, a positive state of the RY signal is represented by R, and a negative state is represented by B. Also,
In the SECAM signal, the R-Y signal and the BY signal are transmitted alternately on each line. Represented by B. Also, α _H is the amount of deviation of the horizontal synchronization signal between adjacent tracks,
α _H = 1.5 for VHS PAL and SECAM signal VTRs
is set to . Note that the track pitch T _P at this time was 49 μm, and the tape speed was 23.4 mm/S.

In this way, for VHS system PAL, SECAM signal
In a VTR, horizontal synchronization signals between adjacent tracks are lined up, and adjacent color signals are also lined up. That is, the neighbor of R is R, and the neighbor of B is B.

Next, we will explain how to perform special playback (still, slow, high-speed, and reverse playback) on such a VTR. FIG. 2 shows head trajectories for static playback, FIG. 3 for high-speed playback, and FIG. 4 for reverse playback, where is the playback trajectory of the A head, and is the playback trajectory of the B head. However, in Fig. 2, both heads A and B draw the same trajectory. As mentioned above, A, B
Since both heads are provided with an azimuth angle, the A head reproduces only the signal of the trajectory written by the A head, and the B head reproduces only the signal of the trajectory written by the B head. Therefore, in FIGS. 2 to 4, the signals in the shaded areas are reproduced. In Fig. 2, the A head receives the signal in the shaded area,
In the B head, the signal in the shaded area is reproduced.
During such special playback, the recording trajectory may be jumped during one playback of one head, or the signal order may be different from that in normal playback when switching heads. These states can be categorized as follows: 1. During one playback of one head, a transition occurs to the next recording trajectory (during high-speed playback). [In Figure 3, the transition from the -A trajectory of the A head to the -A trajectory, and the transition from the -B trajectory to the -B trajectory of the B head] 2. Transition to the next recording trajectory when switching heads ( (during stationary, slow, high-speed, and reverse playback).

[In Figure 2, the transition from the -B trajectory of the B head to the -A trajectory of the A head, and in Figure 4, the transition from the -A trajectory of the A head to the -B trajectory] 3. Move to recording trajectory (during high-speed playback).

[In Figure 3, the transition from the -A trajectory of the A head to the -B trajectory of the B head] 4 Transition to the previous trajectory when switching heads (during stationary, slow, and reverse playback).

[In Figure 2, the transition from the -A trajectory of head A to the -B trajectory of head B, and in Figure 4, the transition from the -B trajectory of head B to the -A trajectory of head A] 5. During one playback, move to the previous two recording tracks (when playing still, slow, or in reverse).

[In Figure 4, from the -A locus of A head to -A
There are five ways: transition to trajectory, transition from -A trajectory to -A trajectory, and transition from -B trajectory to -B trajectory of the B head. In the five cases described above, the continuity of the horizontal synchronization signal and the continuity of the color signal are important. If the continuity of the horizontal synchronization signal is lost, skew distortion will occur on the screen. Next, we will discuss the continuity of color signals. In PAL and SECAM signals, the color signal is switched for each line.
That is, in PAL, the phase of the carrier wave of the R-Y signal is inverted for each line, and in SECAM, the phase of the carrier wave of the R-Y signal is inverted for each line.
The Y signal and BY signal are switched and transmitted line by line. Therefore, if the order of the color signals is reversed in the middle or at the beginning of the field, the color discrimination circuit of the television receiver may malfunction, or it may take a long time for the color to be read in, and the color may not appear, or the color may not appear in the middle or at the beginning of the screen. The hue may be distorted at the top.

Looking at the five cases mentioned above on a VTR with the recording pattern shown in Figure 1, in cases 1) and 5), the horizontal sync signal and color signal are lined up in the recording pattern, so the continuity of the horizontal sync signal is also Signal continuity is also maintained. In case 2), the switching of heads is carried out exactly the same as in the case of normal reproduction, so that the continuity of the horizontal synchronizing signal and color signal is maintained. In case 3), the signal reproduced at the time of head switching is skipped over 2 tracks and 2α _H lines. -A in Figure 3
In the transition from -B to -B track and -
A track and -312 of A track
Line, -313 line (1/2 line), -B
Truck's -313 line (1/2 line), -
Line 314 is skipped, and line -311 shifts to line -315. Therefore, the total number of lines skipped is 625 + 2α _H = 628 (α _H =
1.5), which is an even number, so the continuity of the horizontal synchronization signal and color signal is maintained. In case 4), when switching heads, the reproduced signal returns to the previous track and returns to the 2α _H line. In the transition from -A to -B in Fig. 2, there is a transition from -314 line of the A track to -312 line of the -B track. i.e. 625
+2α _H = Return to the 628 line. Figure 4 -
Similarly, when transitioning from B track to -A track, the line returns to the front by 625+2α _H =628 lines. Since this is an even number, the continuity of the horizontal synchronization signal and color signal is maintained.

In this way, the recording pattern shown in Figure 1
In a VTR, the continuity of the horizontal synchronization signal and color signal is always maintained even during special playback.

Next, a basic block diagram of signal processing of a VHS system PAL and SECAM signal VTR is shown in FIG. 5, and will be briefly explained. In Fig. 5, 1 is a video signal input terminal, 2 is a low-pass filter, 3 is a band filter, and 4 is a video signal input terminal.
is a frequency modulator, 5 is a frequency converter, 6 is an adder, 7 is a head, 8 is a high-pass filter, 9 is a low-pass filter, 10 is a frequency demodulator, 11 is a frequency converter, 12 is an adder, 13 is a video signal output terminal. A video signal applied to an input terminal 1 is separated into a luminance signal and a carrier color signal by a low-pass filter 2 and a bandpass filter 3. The luminance signal is converted into a frequency modulated wave by a frequency modulator 4 and guided to an adder 6.
On the other hand, the carrier color signal is converted to a lower frequency by a frequency converter 5, superimposed on the frequency modulated wave by an adder 6, and recorded on a tape via a head 7. During this frequency conversion to the low frequency range, signal processing is applied to each of the PAL and SECAM signals. The signal reproduced from the head 7 is separated by a high pass filter 8 and a low pass filter 9 into a frequency modulated wave of a luminance signal and a carrier color signal converted to a low pass. The frequency modulated wave is guided to a frequency demodulator 10 and demodulated to obtain a reproduced luminance signal, and an adder 1
Leads to 2. On the other hand, the carrier color signal converted to a low frequency band is returned to its original frequency by a frequency converter 11, and added to the reproduced luminance signal by an adder 12, so that a reproduced video signal is obtained at an output terminal 13. In the process of returning the carrier color signal to its original frequency in the frequency converter 11, signal processing is applied to each of the PAL and SECAM signals.

The present invention provides a method for obtaining continuity of horizontal synchronizing signals and color signals during special playback by increasing the density even further than the pattern shown in FIG. 1, or by using a different pattern. be.

As explained in FIGS. 2 to 4, there are five cases in which signal discontinuity may occur during special playback. α _H in any pattern for each case
This section explains the continuity of horizontal synchronization signals and color signals. In case of 1, 625 + 2α _H at the time of track transition
Move to the end of the line. In case of 5, move to 625+2α _H line front. Also, as mentioned above, when switching heads, in case 2 the signal transitions in exactly the same way as during normal playback, and the continuity of the horizontal sync signal and color signal is maintained no matter what the pattern is, and in case 3
625+2α Move to _H line ahead, if 4, 625+
2α Move to front of _H line. Therefore, the condition for the horizontal synchronization signal to always be continuous in these cases is that the number of skipped lines or the number of lines reversed is an integer, that is, 625 + 2α _H
is an integer, and α _H =n/2 (n: integer). Also, the condition for the color signal to be continuous is that 625+2α _H is an even number, that is, 2α _H
is an odd number, and α _H = (2n+1)/2 (n: integer).

In view of the above points, the present invention attempts to obtain continuity of color signals even during special reproduction when the recording density is further increased than the pattern shown in FIG. 1, or when a different pattern is used. be. The above-mentioned horizontal synchronization signal and color signal continuity conditions are met. From FIG. 1, the only high-density pattern is α _H =0.5. However, if α _H =0.5, the tape speed is 7.8 mm/S, and the track pitch is T _P =16.
μm, resulting in extremely poor audio performance and image quality. Therefore, in the present invention, especially α _H =1.0
(Tape speed 15.6mm/S, track pitch T _P
= 32 μm), it provides a method for obtaining continuity of color signals during special reproduction. With this pattern, both sound and picture quality are almost satisfactory for home use. According to the present invention, not only α _H =1.0 but also α _H =m (m: integer)
Continuity of horizontal synchronization signals and color signals can be obtained during special reproduction for any pattern of , and continuity of color signals can be obtained for any pattern of α _H during special reproduction.

FIG. 6 shows the original recording pattern when α _H =1.0. In FIG. 6, the symbols for tracks, lines and color signals have the same meanings as in FIG. Further, FIG. 7 shows the trajectory of the head during stationary playback, FIG. 8 shows the trajectory of the head during high-speed playback, and FIG. 9 shows the trajectory of the head during reverse playback. This corresponds to FIGS. 2 to 4 for α _H =1.5, and the symbols have the same meanings. In the case of α _H =m, as can be seen from the above explanation, the continuity of the horizontal synchronization signal is always obtained during special playback, but in cases other than the above 2 during special playback, the continuity of the color signal is broken. (Figures 7 to 9).

Also, as can be seen from the pattern in Figure 6, α
When _H = m, adjacent signals are not lined up. Therefore, the interference signal received from the adjacent track has information different from the main signal (information shifted by 0.5 lines).
The luminance signal has a relatively high frequency (frequency deviation 3.8M
Hz to 4.8MHz), the azimuth loss is large, and even if the adjacent signal information differs from the main signal information, it will not be affected much, but the color signal is converted to a lower frequency band. Since the signal is recorded with relatively little azimuth loss, it is easily influenced by adjacent signals. The carrier color signal of the PAL signal transmits information in phase and amplitude, so there is a phase correlation between lines, and this can be used to remove adjacent interference signals, but the carrier color signal of the SECAM signal Since it is a frequency modulated wave, there is no strict phase relationship between lines, and it is difficult to use this to remove adjacent interference signals. When adjacent signals are lined up like the pattern shown in FIG. 1, the adjacent interference signal becomes almost the same signal as the main signal, and its influence is small. In particular, since the SECAM color signal is a frequency modulated wave, if the frequency of the adjacent interference carrier color signal is almost the same as the frequency of the main signal, it will be a zero beat and the amount of interference signal after demodulation will be extremely small.

Taking these points into consideration, the present invention is intended to reduce the interference of adjacent color signals to the same level as in the past, to perform normal color reproduction even during special reproduction, and to enable high-density recording.

Fig. 10 shows a basic block diagram of an embodiment of the present invention, Fig. 11 shows the waveforms and color signal relationships of each part in Fig. 10, and Fig. 12 shows the color signal recording pattern (α _H = 1.0) in the present invention. The present invention will be explained according to these figures. In FIG. 10, numerals 1 to 13 represent the same elements as in FIG. 5 and perform the same operations. 1
4 and 24 are 1.5H day line, 15 and 23 are
1.0H delay line, 16 and 22 are 0.5H delay lines, 17 and 25 are switch circuits (SW),
18, 26 are head switching signal input terminals, 19, 2
7 is a flip-flop, 20 and 28 are head switching signals, and 21 and 29 are flip-flops 1 and 29, respectively.
9 and 27, and their waveforms are indicated by the same numbers in FIG. In addition, flip-flop 27
The output signal 29 has two states corresponding to the recording state, 29.1 and 29.2 in FIG. 11, respectively.
Shown as 2. The symbols in FIG. 12 are the same as those in FIGS. 1 and 6, but the line numbers represent those for color signals, and the luminance signals remain the same as in FIG. 6.

In FIG. 10, the luminance signal is processed in the same manner as in FIG. 5, and the recorded pattern is as shown in FIG. On the other hand, the output carrier color signal of the bandpass filter 3 is
Switch circuit 1 via 1.5H delay line 14
7, to the b terminal of the switch circuit 17 via the 1.0H delay line 15, to the c terminal of the switch circuit 17 via the 0.5H delay line 16, and directly to the d terminal of the switch circuit 17. The switch circuit 17 includes a head switching signal 20 (FIG. 11 20) applied to the terminal 18 and a signal 21 whose frequency is divided by half by a flip-flop 19.
(Fig. 11, 21), and the output is: terminal a when signal 20...high, signal 21...high, terminal b when signal 20...low, signal 21...high, signal 20...high , signal 21... is connected to terminal c when it is low, signal 20... is low, and signal 21... is connected to terminal d when it is low (11th
Figure 30). Therefore, as shown in FIG. 11, the output of the switch circuit 17 provides signals with delays of 1.5H, 1.0H, 0.5H, 0, 1.5H, . . . with respect to the input signal. The output color signal of the switch circuit 17 is guided to the frequency converter 5 and recorded in the same manner as in FIG. Now, truck-B, -A,-
If the color signals recorded in B, -A, -B... are delayed by 1.5H, 1.0H, 0.5H, 0, 1.5H..., the color signal recording pattern will be the first one.
It will look like Figure 2. In this way, the color signals are aligned in the recording pattern, and during reproduction, the interference signal received from the adjacent track is made into almost the same signal as the main signal, so that the influence can be reduced. Note that the relationship between the track and color signal delay is not limited to that shown in FIG. 12; the color signal delay order is 1.5H, 1.0H,
It is clear that the order of 0.5H, 0, 1.5H, etc. is sufficient.

Next, we will discuss the regeneration system. The reproduced carrier color signal converted to a low frequency signal, which is the output of the low frequency filter 9, is returned to its original frequency by a frequency converter 11.
After passing through the 0.5H delay line 22, 1.0H delay line 23, and 1.5H delay line 24, the terminals a, b, c, and d of the switch circuit 25 are connected as they are.
Each will be guided to The switch circuit 25 transfers the head switching signal 28 (FIG. 11 28) applied to the terminal 26 and the signal 28 to the flip-flop 27.
It is controlled by a signal 29 (29.1 or 29.2 in FIG. 11) whose frequency is divided by 1/2, and operates in the same way as the switch circuit 17 (28, 29.1, 32 or 28, 29.2 in FIG. 11). , 35). Looking at the relationship between the control signals 20 and 21 of the switch circuit 17 during recording and the control signals 28 and 29 of the switch circuit 25 during playback, it appears that the signals 20 and 28 are always in the same phase with respect to the recording and playback tracks. It is determined. That is, in FIGS. 11 and 12, head B records. When playing back (-B, -B, -B...), the level is high; when recording and playing back with the A head (-A,
-A, -A...) are at a low level.
However, when the signals 21 and 29 are in phase during recording, when they are reproduced, there are cases in which they are in the same phase (Fig. 11, 29.1) and cases in which they are in opposite phase (Fig. 11, 29.2).
occurs. Playback switch circuit 2 in each case
Figures 11-32 to 34 show the connection of 5, the amount of delay of the reproduced color signal, and the amount of delay of the color signal for both recording and reproduction.
(Reproduction 1), 35-37 (Reproduction 2). Play 1
In this case, as shown in Figure 11 34, the color signal delay for recording and playback is 2.0H between 3 fields.
Then, 1 field becomes 0 and it repeats. In addition, in the case of reproduction 2, as shown in FIG. 11, the color signal delay for both recording and reproduction is 1.0H for three fields and 3.0H for one field, which is repeated. In either case, the difference in color signal delay amount between fields (tracks) is 2.0H, and the order of R and B of the reproduced color signal does not change, even if the head is switched, R, B, R, B,... ...so the order is
The color discrimination circuit of a television receiver operates normally and can reproduce normal colors.

Next, the case of special playback will be described. During special playback, there are five cases in which color signal discontinuity may occur, as described in the explanations of FIGS. 2 to 4 and 7 to 9. The present invention will be described for these five cases. FIG. 13 is a diagram showing the amount of delay of the color signal of each track when the color signal recording pattern shown in FIG. 12 is specially reproduced with the playback trajectory shown in FIGS. 7 to 9. 28 to 33 are the same as in FIG. 11. 38-40 are static playback (7th
), 41-43 are high-speed playback (Figure 8), 44-4
Reference numeral 6 represents the reproduction track, recording color signal delay, and color signal delay for both recording and reproduction in the example of reverse reproduction (FIG. 9). In case of special playback 1 mentioned above, when transitioning from -A track to -A track in Figure 8,
At the time of transition from -B track to -B track, for example, the color signal lags as shown in FIG. 13, 43. As described above, in this case, since one head is performing one reproduction, the color signal delay switching is not performed during reproduction. As can be seen from the recording pattern in FIG. 12, since the color signals of every other track are lined up, continuity of the color signals can be obtained. In addition, in FIG. 13 43, from -A to -A,
The amount of delay in the color signal when transitioning from -B to -B
1.0H has changed. Since the order of the color signals is reversed when reproducing the original pattern as shown in FIG. 6, the order of the color signals can be made normal by changing the original signal by 1.0H at the time of transition. In case of 2,
This corresponds to the transition from -B to -A in FIG. 7 and from -A to -B in FIG. 9, resulting in color signal delays as shown at 40 and 46 in FIG. 13. In this case, the color signal order is maintained by the same color signal delay switching as during normal reproduction.
In the case of 3, the color signal lags as shown at 43 in FIG. 13 during the transition from -A to -B in FIG. In this case, the amount of color signal delay when switching heads is
Changes by 1.0H. Since the color signal order is reversed when the original pattern (FIG. 6) is reproduced, it can be made normal by changing the delay amount of 1.0H. 4, in Figure 7 - A to - B, in Figure 9 - B
In the transition from to -A, Fig. 13 40, 4
There will be a color signal delay like 6. In this case as well, the color signal delay amount changes by 1.0H when switching heads, and the color signal order is reversed when the original pattern is reproduced, so it can be made normal in this way. In case of 5,
In Figure 9 -A to -A, -A to -A,
In transitioning from -B to -B, Figure 13 4
There will be a color signal delay like 6. In this case as well, the reproduced color signal order can be made normal as in case 1). In FIG. 13, switching signal 2 of switch 25
Although it was written as 29.1 as 9, it is exactly the same even if it is written as 29.2.

In the example of FIG. 10, the regeneration switch circuit 25
Although the output of the frequency converter 11 is directly connected to the d terminal of the d terminal, it may be connected via a 2.0H delay line. At this time, the reproduction color signal delay when connected to the d terminal in the reproduction of Figures 11 and 13 is
2.0H, and the color signal delay during recording and playback also increases by 2.0H, but the order of the color signals is not affected.

As described above, according to the present invention, it is possible to keep the color signal order normal in any case of special reproduction, eliminate errors in color discrimination in a television receiver, and provide normal colors.

In the embodiment shown in FIG. 10, the control signal 29 of the reproduction switch circuit 25 has one in phase and the other in phase with respect to the recording time, but by using an index signal, the control signal 29 can be made to be in the same phase as the recording time. An example of this will be described with reference to FIG. 14, and FIG. 15 showing waveforms of various parts of FIG. 14. In Figure 14, 1 to
29 represents the same thing as in FIG. 47 is a vertical synchronization signal separation circuit, 48 is an AND circuit, 49 is an adder, 50 is an index separation circuit, and 54 is a 2H
It is a daily line. Vertical synchronization signal 5 separated from the input video signal by vertical synchronization signal separation circuit 47
1 (FIG. 15, 51), the head switching signal 20 (FIG. 15, 20) applied to the terminal 18, and the output signal 21 of the flip-flop 19 (FIG. 15, 21) are led to an AND circuit 48, and an index is applied to its output. A signal 52 (FIG. 15 52) is obtained. This index signal 52 is superimposed on the color signal converted into a low frequency signal by an adder 49 and recorded. At this time, the index signal is inserted into the vertical blanking of the track where both signals 20 and 21 are at a high level, that is, the track where the color signal delay is 1.5H. During reproduction, an index signal 53 (FIG. 15) is separated from the output color signal of the low-pass filter 9 by an index separation circuit 50. If the flip-flop 27 is controlled by this index signal so that its output is at a high level when the index signal is at a high level, the signal 29 will have a phase as shown in FIG. ) and signal 29 can have the same phase as during recording.
Further, the output color signal of the frequency converter 11 is connected to the d terminal of the switch circuit 25 through a 2H delay line 54, and the control signal of the switch circuit 25 and the color signal delay during reproduction are the same as the 11th delay line. In playback 1 in the figure, the reproduction color signal delay when connected to the d terminal (d in Figure 33) and the color signal delay during recording and playback (d in Figure 34) are both 2.0H. The color delay is always 2.0H. In this case, unlike the example shown in FIG. 10, there is no difference in the delay of the color signal depending on the field, so flicker does not occur at the vertical boundaries of colors, resulting in better results. However, the chrominance signal lags behind the luminance signal by 2H. To reduce or eliminate this deviation to 1.0H, adjust the reproduced brightness signal.
It is also possible to delay the luminance signal by lH (l: a positive integer) by using a delay element such as a CCD or by modulating the luminance signal to a high frequency with an ultrasonic delay line and delaying it. Here, if the luminance signal is delayed by 1H, the chrominance signal will be delayed by 1H with respect to the luminance signal, and if the luminance signal is delayed by 2H, the timings of the luminance signal and the chrominance signal will match exactly, resulting in a high-quality reproduced image.

In the above explanation, for the case of α _H = 1.0, the recorded color signal is repeatedly delayed as 1.5H, 1.0H, 0.5H, 0, and the reproduced color signal is delayed as 0.5H, 1.0H, 1.5H,
We have described the case where the delay is repeated by 0 (2.0H), but any α _H = 2m + 1 (m: integer)
The same is true for . Also, any α _H =2m+1
The recording color signal has a delay of 0.5H for each track.
or 2kH (k: integer)
Delay in the order of added time (not necessarily 0.5H,
It doesn't have to be a value like 1.0H, for example
1.8H, 1.3H, 0.8H, 0.3H or 1.8H, 3.3H,
(It may be repeated in 0.8H, 2.3H, or it may be repeated in units of multiples of 4 tracks instead of in units of 4 tracks), the delay of the reproduced color signal increases by 0.5H for each track, or It may be delayed in the order of 2kHz plus time.
In this case, if you do not want to delay the reproduced luminance signal,
1H recording/playback total color signal delay during normal playback
When delaying the reproduced luminance signal, the difference between the total delay amount of the color signal and the delay amount of the luminance signal should be an integral multiple of 1H. For example, with the configuration shown in Figure 14, the luminance signal
If you delay 1.5H, day line 2
2, 23, 24, 53 respectively, 0, 0.5H,
As a delay line of 1.0H and 1.5H, it is possible to perfectly match the timing of the luminance signal and color signal during reproduction.

In addition, when α _H = 2m, the delay of the recording color signal increases by 0.5H for each track, or the delay is increased by 2kHz for each track (for example, 0, 0.5H,
It is sufficient to delay the reproduced color signal in the reverse order of recording.

The present invention has been described above for the case of α _H =m, particularly α _H =1.0, but as described above, the present invention is effective for any α _H pattern.
In the case of arbitrary α _H , the recorded color signal is delayed by increasing the delay by (α H +0.5)H for each track, or by adding 2 kHz to the delay, and the reproduced color signal is delayed by increasing the delay by (α _H +0.5)H for each track, or by adding 2kHz to the delay, and the reproduced color signal is Just delay it in order. α _H
= 1.0, α _H +0.5 = 1.5, and the recording color signal is delayed by 1.5H for each track or by adding 2kHz to the delay time, for example, 1.5 H, 3.0H−2H
= 1.0H (k = -1), 4.5H - 4H = 0.5H (k = -
2), 6.0H-6H=0 (k=3), which is consistent with the above explanation. α _H = 2m
When +1, α _H +0.5=2m+1.5, and α _H =
The delay will be the same as when 1.0 (m=0). α _H =
When the distance is 2m, α _H +0.5 = 2m + 0.5, and the recording color signal can be delayed in the order of 0, 0.5H, 1.0H, 1.5H so that the delay increases by 0.5H for each track, for example. . When α _H =0.75, α _H +0.5=
For example, the recording color signal is 0, 1.25H, 2.5H - 2H = 0.5H, 3.75H - 2H for each track.
=1.75H, 5.0H−4H=1.0H, 6.25H−6H=
0.25H, 7.5H−6H=1.5H, 8.75H−8H=0.75H,
It is sufficient to delay in the order of 10.0H-10H=0.

In addition, in a pattern in which the direction of head rotation and the direction of tape running are opposite, all of the above applies if α _H is negative. Furthermore, the present invention can also be applied to systems other than recording one field per track.
Needless to say, this method can be applied by appropriately setting the difference in recording color signal delay amount for each track.

As described above, according to the present invention, PAL
When recording and reproducing SECAM signals, it is possible to achieve higher density than before, reduce adjacent interference of color signals, and normalize the order of color signals even during special playback to obtain sufficient image and sound quality. .

[Brief explanation of the drawing]

Figure 1 shows the current VHS system for PAL and SECAM signals.
Figures showing the VTR recording pattern (α _H = 1.5); Figures 2 to 4 are diagrams showing head trajectories when performing special playback with the pattern in Figure 1; Figure 5 is the signal in the pattern in Figure 1. A basic block diagram of the processing method, Figure 6 is a recording pattern diagram when α _H = 1.0, Figures 7 to 9 are diagrams showing head trajectories when performing special reproduction with the pattern in Figure 6, Figure 10 The figure is a block diagram showing one embodiment of the present invention. Figure 11 is a diagram showing the waveforms of each part of Figure 10 and the delay time of the color signal during normal playback. Figure 12 is an example of the color signal recording pattern in the present invention. 13 is a diagram showing the waveforms of each part in FIG. 10 and the delay time of the color signal during special playback,
FIG. 14 is a block diagram showing another embodiment of the present invention, and FIG. 15 is a waveform diagram of each part of FIG. 14. 14, 15, 16, 22, 23, 24, 53...
...Delay line, 17, 25...Switch circuit, 18...Head switching signal input terminal, 19...
Flip-flop, 48...AND circuit, 47...
. . . Vertical synchronization signal separation circuit, 50 . . . Index separation circuit.

Claims (1)

[Claims] 1. Separate an input video signal using the PAL or SECAM system into a luminance signal and a carrier color signal, convert the luminance signal into an angle modulated wave, convert the carrier color signal to a low frequency, and convert the angle modulated signal into a low frequency signal. It is superimposed on the low frequency band and recorded by forming a diagonal track on the recording medium using two heads having an azimuth angle to each other. During playback, the angle modulation signal is demodulated to obtain a reproduced luminance signal, and the low frequency signal is In a video signal recording and reproducing apparatus configured to convert the carrier color signal converted into the original frequency to obtain a reproduced carrier color signal, and to synthesize the reproduced luminance signal and the reproduced carrier color signal to obtain a reproduced video signal. , the recorded carrier color signal is constant for each track or 2kHz (k: integer, H: horizontal scanning time)
During playback, the reproduced conveyance color signal is sequentially delayed with the same fixed time difference as during recording, or a time difference of 2 kHz added, in the reverse order of the recording time, each time the head is switched. A video signal recording and reproducing device characterized by: 2 Playback at the same speed as recording (normal playback)
The present invention is characterized in that the total color signal delay time during recording and reproduction of time is an integral multiple of 1H for every track, and the difference in total color signal delay time between tracks is an integral multiple of 0H or 2H. A video signal recording and reproducing device according to claim 1. 3. During recording, a pilot signal synchronized with the repetition of the color signal delay is recorded together, and during playback, the pilot signal is used to control the repetition timing of the playback color signal delay, thereby reducing the color signal delay in the total recording and playback during normal playback. The video signal recording and reproducing apparatus according to claim 2, characterized in that the time is the same for all tracks. 4. The total delay time difference between recording and reproducing color signals between tracks during normal playback is an integral multiple of 0H or 2H, and the reproduced luminance signal is delayed so that the time difference between the luminance signal and chrominance signal during reproduction is The video signal recording and reproducing apparatus according to claim 1, characterized in that the video signal recording and reproducing apparatus is configured to be an integral multiple of 0H or 1H. 5. At the time of recording, a pilot signal synchronized with the repetition of the color signal delay is recorded, and at the time of playback, the repetition timing of the playback color signal delay is controlled by the pilot signal, so that the color signal delay time in the total recording and playback during normal playback is determined. Claim 4 is characterized in that:
2. The video signal recording and reproducing device described in 2. 6. A patent claim characterized in that the total recording and reproduction color signal delay time during normal playback is made to be an integral multiple of 1H for every track, and the reproduced luminance signal is delayed by an integral multiple of 1H. The video signal recording and reproducing device according to item 4. 7. The video signal recording and reproducing apparatus according to claim 5, wherein the video signal recording and reproducing apparatus is configured to match the timing of the luminance signal and the color signal during normal reproduction. 8. The horizontal synchronization signal deviation between adjacent tracks is α _H = m (m: integer), and the delay time difference for each track of the recorded carrier color signal is 0.5H or 2kHz added to that time. A video signal recording and reproducing apparatus according to claim 1. 9. Means for sequentially delaying color signals with a fixed time difference or a time difference of 2 kHz for each track or each head switch is a means for sequentially delaying color signals with a fixed time difference or a time difference of 2 kHz for each track or head change. a second means for coupling the output of each delay means to an input of a switch circuit, controlling said switch circuit with a head switching signal and its frequency divided signal; 2. The video signal recording and reproducing apparatus according to claim 1, further comprising a third means for sequentially switching and taking out the video signal.