JPH0832070B2 - Color video signal line sequential processing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal magnetic recording / reproducing apparatus for recording two color difference signals as line sequential color signals.

Configuration of conventional example and its problems There are many types of video signal magnetic recording / reproducing apparatus (so-called "VTR") using a magnetic tape due to the difference in the video signal recording method. Among them, VT that records two color difference signals as line-sequential color signals from the viewpoint of efficient use of bandwidth.
R is attracting attention. In particular, various problems occur when recording and reproducing a signal in which a standard composite SECAM signal is encoded in a conventional line-sequential VTR developed as a PAL system.

The outline of the line-sequential VTR will be described below to clarify the above problem.

FIG. 1 is a conventional example of a VTR in which a luminance signal (so-called Y signal) and a color difference signal are separated into separate tracks, and the color difference signal is recorded as a line-sequential color signal.

In FIG. 1, 1, 2 and 3 are input terminals, 4,5 are FM modulators (MOD), 6 is a horizontal sync signal detection circuit (SYNC.SEP), 7
Is a flip-flop (F / F), 8 and 20 are monostable multivibrators (M and M), 9 is a line sequentializer, 10 is a mixer, and 11,1
2, 13 and 14 are magnetic heads, 15 is a magnetic tape, 16 and 17 are FM demodulators (DEMOD), 18 is a discrimination signal detection circuit, 19 is a discrimination signal removal circuit, 21 is a synchronizer, 22, 23, 24 Is the output terminal, 25, 26, 27
Is a switch, 28, 29, 30, 31, 32 are switch terminals, and 33 is a horizontal scanning period delay line (IHDL). Line sequentializer 9
Is composed of a switch 25 and switch terminals 28 and 29, and the synchronizer 21 is composed of a delay line 33 for one horizontal scanning period, switches 26 and 27, and switch terminals 30, 31 and 32. By the way, in the PAL system, two color difference signals are composed of a U signal and a V signal, and a Y signal, a U signal and a V signal are inputted to the input terminals 1, 2 and 3, respectively. The Y signal is modulated by the FM modulator 4 and is recorded / reproduced on the magnetic tape 15 via the magnetic heads 11 and 14, and at the time of reproduction, the Y signal is demodulated by the FM demodulator 16 and output terminal 22
Is output to

On the other hand, the U signal and the V signal are line-sequential color signals which are alternately switched for each horizontal scanning period and are modulated by the FM modulator 5,
Recording / playback on the magnetic tape 15 via 12, 13 and FM during playback
The line-sequential color signal demodulated by the demodulator 17 is output to the u, v
The signals are separated and output to the output terminals 23 and 24, respectively.

Next, the switching operation of the line sequentializer 9 and the synchronizer 21 of FIG. 1 will be described in detail with reference to FIG.

In FIG. 2, A is the horizontal axis of FIG. 2, and the integer n
(= 1, 2, 3, ...) Shows the n-th horizontal scanning period.
B, C and D are a Y signal, a U signal and a V signal applied to the input terminals 1, 2 and 3, respectively. E is the output of the horizontal sync signal detection circuit 6,
F is the output of the flip-flop 7, G is the output of the monostable multivibrator 8, H is the line sequential color signal which is the output of the mixer 10, I is the output of the discrimination signal detection circuit 18, and J is the output of the monostable multivibrator 20. Output, K and L are output terminals 23 and 24 respectively
U signal and V signal. For E, F, G, I, J, the upper side of the drawing is the high level “H” state of the output logic,
The lower side shows the low level “L” state.

The horizontal sync signal detection circuit 6 detects the start edge of the horizontal sync signal contained in the Y signal of the input terminal 1, outputs a positive-direction trigger pulse indicated by E in FIG. 2, and detects the rising edge of this trigger pulse E. The output of the flip-flop 7 is inverted at the timing. When the output F of the flip-flop 7 is "H", the switch 25 is connected to the switch terminal 28,
The line-sequentializer 9 outputs the U signal (C in FIG. 2) at the input terminal 2, and when the output F of the flip-flop 7 is "L", the switch 25 is connected to the switch terminal 29 to perform the line-sequentialization. The device 9 outputs the V signal (D in FIG. 2) at the input terminal 3. The monostable multivibrator 8 puts the output in the “L” state at the rising timing of the output F of the flip-flop, holds the “L” state for an appropriate time in the same horizontal blanking period, and keeps the “H” state in the other periods. Then, the color discrimination signal G is generated. In the mixer 10, the output of the line sequentializer 9 and the color discrimination signal G are mixed into a line sequential color signal H. The color discrimination signal G is in the "L" state every two horizontal scanning lines. In this example, in particular, the odd-numbered horizontal scanning period starts, that is, immediately before the U signal portion of the line-sequential color signal H. It is understood that the state becomes a state and the role of the color discrimination signal is fulfilled.

At the time of reproduction, the line-sequential color signal H is removed by the discrimination signal removing circuit 19 only at the discrimination signal portion, is replaced by the pedestal potential of the video signal, and is directly applied to the switch terminals 30 and 32. And those applied to the switch terminal 31 via.

The discrimination signal detection circuit 18 detects the start of the discrimination signal included in the line-sequential color signal H and outputs a trigger pulse I. The monostable multivibrator 20 sets the output to the "H" state at the rising timing of the trigger pulse I, and outputs the output waveform J while maintaining the "H" state for one horizontal scanning period. The switches 26 and 27 are connected to the switch terminals 30 and 31, respectively, when the output J is in the "H" state, output the line-sequential color signal H to the output terminal 23, and output the line-sequential color signal to the output terminal 24. A signal obtained by delaying the signal H by one horizontal scanning period is output. On the other hand, when the output J is in the "L" state, the switches 26 and 27 are connected to the switch terminals 31 and 32, respectively, and the output terminal 23 outputs a signal obtained by delaying the line sequential color signal H by one horizontal scanning period,
The line-sequential color signal H is output to the output terminal 24. Here, consider a case where the color difference signal obtained by passing the standard composite SECAM signal through the SECAM signal decoder shown in FIG. 3 is recorded / reproduced in the conventional line-sequential VTR shown in FIG. Generally in the SECAM system, D _B ′ and D _B ′ are carrier color signals and R is a color difference signal.
It is usual to use the symbols -Y, BY, but in the following, for convenience of explanation, the V signal, D _B ', BY will be used as D _R ′, RY.
The expression U signal will be used. Figure 3 shows
It is a block diagram of a SECAM signal decoder. In FIG. 3, 34 is an input terminal, 35 is a Y / C separation circuit, 36 is a discrimination signal detection circuit, 37 is a horizontal synchronization signal detection circuit (SYNC SEP), 38 is a flip-flop (F / F), and 39 is simultaneous. 40,41 are FM demodulators (DEMOD), 42,43,44 are output terminals, 45 is one horizontal scanning period delay line (IHDL), 46,47 are switches, 48,49,50 are switch terminals , The synchronizer 39 has a delay line 45 for one horizontal scanning period.
And switches 46, 47 and switch terminals 48, 49, 50.

The composite SECAM signal applied to input terminal 34 is Y
It is supplied to the / C separation circuit 35 and the horizontal synchronization signal detection circuit 37.
Among the output lines of the Y / C separation circuit 35, the Y signal obtained by removing the color signal from the composite SECAM signal is output to the output line directly connected to the output terminal 42. Only the color signal is output to the other output line, that is, the output line directly connected to the discrimination signal detection circuit 36.

The horizontal sync signal detection circuit 36 extracts the horizontal sync signal from the composite SECAM signal, and the flip-flop 38 inverts the output at the timing of the start of the horizontal sync signal. However, in the standard composite SECAM signal, the V signal is determined in the odd-numbered horizontal scanning period in the odd frame, and the U signal is determined in the odd-numbered horizontal scanning period in the even frame.

A color discrimination signal is superimposed on the beginning of each field. The discrimination signal detection circuit 36 extracts the color discrimination signal, resets the inversion direction of the flip-flop for each field, and outputs the flip-flop 38 accurately while the composite SECAM signal of the input signal is the U signal. For example, it is controlled so as to be in the "H" state.

In particular, in recent SECAM signal decoders, from the viewpoint of stability of color discrimination signal detection, the non-modulated subcarrier superimposed on the back porch of the horizontal sync signal of the standard composite SECAM signal is different for each line for line discrimination. A discrimination signal detection circuit that utilizes the fact that the frequency is used may be used. By the way, the non-modulated subcarrier is defined as 4.25 MHz for the U signal line and 4.406 MHz for the V signal line, and a discrimination signal detection circuit composed of a frequency discriminator or the like is used. When the discrimination signal detection circuit is replaced with the discrimination signal detection circuit 36 using the color discrimination signal at the beginning of each field, the flip-flop 38 is only reset every two horizontal scanning lines, and the other circuits. It is also possible to apply such a discrimination signal detection circuit because it has no effect on.

Returning to the explanation of the block diagram of FIG. The switch 46 (47) is connected to the switch terminal 48 (49) when the output of the flip-flop 38 is “H”, and the FM demodulators 40 and 41 are connected.
The input signal itself of the synchronizer 39 and the input signal of the synchronizer 39 one horizontal scanning line before are applied to each. The reverse is true when the output of the flip-flop 38 is in the "L" state. The U and V signals demodulated by the FM demodulators 40 and 41 are output to the output terminals 43 and 44, respectively.

In the standard composite SECAM signal, the first line of the first field of the first frame is determined to be the V signal, and in the following lines, fields and frames, the U signal and the V signal are alternated for each horizontal synchronization signal. The frame (4 fields or 1250 lines) is arranged one by one, and the color signal series shown in a of FIG. 4 is obtained. FIG. 4 shows Y, U, V obtained by the SFCAM signal decoder shown in FIG.
FIG. 7 shows a color signal series of each part when a signal is input to the conventional line-sequential VTR shown in FIG. 1. In FIG. 4, (a) is a color signal series of standard composite SECAM signals, (b) is a U signal series and V signal series obtained by passing the standard composite SECAM signals through the SECAM signal decoder shown in FIG. 3, (c) ) Is a color signal series of the output signal of the line sequentializer 9 when the SECAM signal decoder output b is input to the conventional line sequential VTR shown in FIG. The numbers on the horizontal axis in a, b, and c of FIG. 4 indicate the frame number and the field number, and particularly for b, the left half and the right half are SECAM, respectively.
It corresponds to the U and V signals of the signal decoder output terminals 43 and 44.

Further, the vertical axis represents the line number, which indicates the 1st to 313th lines for the odd field and the 314th to 625th line for the even field. Further, in the figure, U'and V'represent UCAM and V signals in SECAM.
It shows that the signal has once passed through the delay line 45 in one horizontal scanning period in the signal decoder.

As shown in a, the standard composite SECAM signal has U and V signals only every other horizontal scanning period. As a matter of course, the U signal output of the SECAM signal decoder shown in b is an odd number of odd frames. The line and the even line of the even frame are interpolated with the signal U ′ of one horizontal scanning period before. The V signal output of the SECAM signal decoder is interpolated by the signal V'one horizontal scanning period before in the even line of the odd frame and the odd line of the even frame.

Further, in b, the first line of the odd field of the odd frame of the U signal (for example, the first field of the first frame) and the 314th of the even field of the even frame of the U signal (for example, the fourth field of the second frame). Line 314 of the even field of the odd frame of the V signal (for example, the second field of the first frame) and the first line of the odd field of the even frame of the V signal (for example, the first field of the second frame) are one horizontal The interpolation operation by the scanning period delay line 45 is performed, but the video signal is missing. It is a line indicated by * in b of FIG. The reason for the loss of the video signal is that in the standard SECAM signal, one line before the line indicated by * in FIG. 4b corresponds to the vertical blanking interval, and the color signal is not transmitted. This is because the color signal is not output as the output of the one horizontal scanning period delay line 45 in the line indicated by * in FIG.

Also, the line-sequentializer 9 of the line-sequential VTR shown in FIG.
Is not controlled by the color discrimination signal of the composite SECAM signal of the input signal, so when recording the SECAM signal decoder output shown in b of FIG. 4 in the VTR, in some cases, that is, the line sequentializer Depending on the switching direction of 9, the line-sequential color signal sequence shown in c of FIG. 4 may be generated. In this case, the U'signal and V'via the one horizontal scanning period delay line in the SECAM signal decoder are always provided. The signal is used and recorded.

Therefore, the drawbacks of the conventional line-sequential VTR are that the color difference signals to be recorded are subject to the current band limitation of the delay line 45 for one horizontal scanning period, and as shown in FIG. 4c, the first line of each frame. However, even if the VTR playback output is suitable for a SECAM signal encoder, it does not become a standard composite SECAM signal due to the lack of a video signal.

As the biggest drawback, it can be understood by comparing a and c in FIG. 4, but the color difference signal series of the corresponding lines in a and c are inverted. This means that the line-sequential synchronization of all systems such as cameras, decoders, VTRs, encoders, etc. cannot be obtained, which causes a defect that does not match the color signal series of standard composite SECAM signals, resulting in poor system extensibility. Hold.

It is an object of the present invention to make the first and second line-sequential color signals the same color signal when the first line-sequential color signal is synchronized and further line-sequentially obtained to obtain the second line-sequential color signal. The purpose is to make a series.

The present invention comprises a synchronizer and a first controller for controlling the synchronizer based on a color discrimination signal included in a first line-sequential color signal. A line sequentializer for converting a signal obtained by synchronizing the line sequential color signals into a second line sequential color signal and a second control device for alternately switching for each horizontal scanning line to control the line sequentializer. A color video signal line-sequential processing device characterized in that the output of the first control device controls the second control device to match the color signal series of the first and second line-sequential color signals. is there.

Description of Examples Examples of the present invention will be described below. In order to achieve the object of the present invention when recording and reproducing a signal obtained by decoding a standard composite SECAM signal to the conventional line-sequential VTR, switching of the line-sequentializer of the line-sequential VTR is performed by switching the color of the standard composite SECAM signal. It is necessary to perform switching considering the signal order.

FIG. 5 shows a first embodiment of the present invention. FIG. 5 shows a configuration in which one input terminal is added to the conventional line-sequential VTR shown in FIG. 1, a color discrimination signal is input from the SECAM signal decoder, and the order of the color difference signals of the line-sequential color signal is controlled. Has become.

The circuit a in FIG. 5 is a SECAM signal decoder, which has almost the same configuration as that in FIG. 3, but is provided with an output terminal for making the output of the discrimination signal detection circuit 36 available to the outside.
The circuit b in FIG. 5 is the conventional line-sequential system shown in FIG.
It is almost the same as the recording part of VTR, only flip-flop 53
However, it can be reset by the output of the discrimination signal detection circuit of the a circuit.

In FIG. 5, the same reference numerals as those in FIGS. 1 and 3 perform the same operation. Reference numeral 51 is an output terminal for the output of the discrimination signal detection circuit 36, and 52 is an input terminal for inputting the signal of the output terminal 51. The flip-flop 53 is reset by this input signal. The flip-flop 53 operates in the same way as the flip-flop 38. That is, switch 4 controlled by flip-flops 38 and 53.
6,47 and 25 always perform the same inversion operation. That is, when the switches 46 and 47 are connected to the switch terminals 48 and 49 (49, 50), the switch 25 is connected to the switch terminal 28 (29).

Similar to FIG. 4, the series of color signals for the first embodiment (FIG. 5) of the present invention will be considered with reference to FIG.

FIG. 6a shows the color signal sequence of the carrier color signal of the standard composite SECAM signal at the input terminal 34, b the color difference signal sequence of the U signal and V signal at the output terminals 43 and 44 of the SECAM signal decoder, and the left side of FIG. The U signal sequence and the V signal sequence on the right side of FIG. Reference numeral c is a color difference signal sequence output from the line sequentializer 9 of the line sequential VTR. The vertical and horizontal axes of a, b, and c are the fourth
It is the same as the figure. Further, U ′ and V ′ in the figure are
It shows that the U signal and the V signal have once passed through the horizontal scanning period delay line 45 in the SECAM signal decoder.

Although a and b in FIG. 6 are the same as a and b shown in FIG. 4, c is different between FIG. 4 and FIG. In addition, c in FIG.
Has the same color difference signal sequence as a in FIG. That is, the problems such as the band limitation due to the one horizontal scanning period delay line 45 and the loss of the video signal in the first line of each frame, which have occurred in the conventional line sequential VTR, are solved.

This is because the flip-flop 53 is reset by the output of the discrimination signal detection circuit 36 and operates in the same manner as the flip-flop 38. That is, the output terminal at a certain time
Although either the U or V signal of 43 or 44 outputs the output of the delay line 45 for one horizontal scanning period, the line sequentializer 9 always outputs the signal passing through the delay line 45 for one horizontal scanning period. Is controlled not to use.

 The second embodiment is shown in FIG.

FIG. 7a is a conventional line-sequential VTR shown in FIG.
The output terminal is provided so that the output of the discrimination signal detection circuit 18 can be taken out to the outside. Further, b in FIG. 7 is a SECAM signal encoder, which is a conventional S encoder.
It is almost the same as the ECAM signal encoder, but it can be reset by an external color signal discrimination signal.

In FIG. 7, the components having the same numbers as those in FIG. 1 perform the same operation. 53, 54 are output terminals, 55, 56, 57, 58 are input terminals, 59 is a horizontal sync signal detection circuit (SYNC SEP), 60 is a flip-flop (F / F), 61 is a line sequentializer, and 62 is an FM. A modulator (MOD) 63 is a mixer, 64 is a switch, and 65 and 66 are switch terminals. The line sequentializer 61 includes a switch 64 and switch terminals 65 and 66.

The operation of the SECAM signal encoder shown in FIG. 7b will be described. Input signals Y, U, V signals are input terminals 55, 57, 5
Applied to 8. The horizontal sync signal detection circuit 59 detects the horizontal sync signal from the Y signal at the input terminal 55 and generates a pulse corresponding to E in FIG. With each pulse, the output of the flip-flop 60 is inverted and an output corresponding to F in FIG. 2 is output. When the output of the flip-flop 60 is in the "H" state, the switch 64 is connected to the switch terminal 65, and when it is in the "L" state, the switch 64 is connected to the switch terminal 66. The flip-flop 60 controls the FM modulator 62, and the FM modulator 62 receives a U signal.
The center carrier position of the FM wave is changed when the signal comes in and when the V signal comes in. After this, FM
The modulated carrier color signal is mixed with the Y signal of the input terminal 55 by the mixer 63, becomes a standard composite SECAM signal, and is output to the output terminal 54.

Here, as in FIG. 6 showing the signal sequence of each part in FIG. 5, let us examine the signal sequence of each part in FIG.

The output of the FM demodulator 17 of FIG. 7 is the same as the output of the line-sequentializer 9 of FIG. 5, resulting in a color difference signal sequence such as c of FIG.
That is, it is the same as the carrier color signal series of the standard composite SECAM signal shown in FIG. Further, the synchronizer 21 of FIG. 7 performs the same switching as the synchronizer 39 of FIG. That is, when the switches 26 and 27 are connected to the switch terminals 30 and 31 (31 and 32) on the same line of the same frame, the switches 46 and 47 of FIG. 5 are switched to the switch terminals 48 and 49 (49, 5).
0). Therefore, the signal series of the U and V output signals of the output terminals 23 and 24 is the same as the signal series of the U and V output signals of the output terminals 43 and 44 of FIG. 5, and the color difference signal series shown in b of FIG. Becomes

Further, the switching operations of the line sequentializer 61 of FIG. 7 and the line sequentializer 9 of FIG. 5 are the same, and when the switch 61 is connected to the switch terminal 65 (66) in the same line on the same frame. Is the switch terminal 28 of the switch 25 in FIG.
Connect to (29). Therefore, the sequence of the carrier color signal of the standard composite SECAM signal at the output terminal 54 becomes the same as the color difference signal sequence of the line sequentializer 9 in FIG. 5, and becomes the color signal sequence shown in c of FIG. That is, the carrier color signal series of the standard composite SECAM signal shown in FIG.

As a result, SEC decoding standard composite SECAM signals
The flip-flop 53 of the recording section (FIG. 5b) of the line-sequential VTR is reset by the output signal of the discrimination signal detection circuit 36 of the AM decoder (FIG. 5a), and the line-sequential VTR is reproduced. SECAM signal encoder (Fig. 7b) by the output signal of the discrimination signal detection circuit 18 of the section (Fig. 7a)
The signal that encodes the standard composite signal is reset by resetting the flip-flop 60 of
Even if R is recorded and reproduced, a standard composite SECAM signal can be obtained by encoding the reproduction output.
Therefore, the problems such as the band limitation of the 1 horizontal scanning delay line 45 and the loss of the video signal at the beginning of each field, which have occurred in the conventional line-sequential VTR, are solved. Moreover, a SECAM signal conforming to the standard broadcasting standard can be obtained as the reproduction output.

Another embodiment of the present invention is not limited to the case where the standard composite SECAM signal as described above is recorded / reproduced in the line-sequential VTR, and the first line-sequential signal is synchronized by the synchronizer in the general video signal. In the case where the simultaneous signal is converted into a signal, and the synchronized signal is converted into the second line sequential signal by the line sequentializer, the control signal of the synchronizer when synchronizing the first line sequential signal is set to the line regularizer. If used as the control signal of, the same effect as that of the above-described embodiment can be obtained, and the deterioration due to the one horizontal scanning delay line and the loss of the video signal at the beginning of each field can be eliminated.

In addition, Y, U, V of the television camera with V signal output,
If the U and V output signals are directly input to the line-sequential VTR of the present invention for recording / reproduction, the Y / C separation circuit 35 in the decoder of FIG. It can be expected as a problem-free method. With such a television camera, Y, U,
As a matter of course, in addition to the V output, the SECAM encoder is equipped to output composite SECAM signals. In other words, since the SECAM encoder width has a color discrimination signal generation circuit, as described above,
Even when the Y, U, and V outputs are directly recorded, by inputting the output of the color discrimination signal generation circuit to the input terminal 52 of FIG. 5, line sequential synchronization of all systems such as cameras, encoders, VTRs, and decoders can be achieved. At the same time, it is very useful, and at the same time, it has the advantage of becoming the standard composite SECAM signal when the output of VTR is concoded in agreement with the color sequential sequence of the standard composite SECAM signal.

Furthermore, it is necessary to anticipate the occurrence of dropouts in VTRs and the like. That is, the reproduction circuit shown in FIG. 7a is not very strong in the color discrimination malfunction due to the dropout period, the detection error of the discrimination signal detection circuit 18 in FIG. 7a, or the like. Therefore, if the reproducing circuit shown in FIG. 8 is used instead of the reproducing circuit shown in FIG. 7a, a more stable color discrimination operation is performed and the standard composite SECAM signal can be sent out stably.

Referring briefly to FIG. 8, FIG. 7a shows a synchronizer using only a color discrimination signal superimposed on a line-sequential color signal.
It controlled 21 switches 26 and 27. However, FIG. 8 normally detects the horizontal synchronizing signal of the Y signal by the horizontal synchronizing signal detection circuit (SYNC SEP) 67, inverts the output of the flip-flop 68 at the timing of the horizontal synchronizing signal of the Y signal, and switches
Control 26, 27. Further, when the output of the flip-flop 68 malfunctions in the inversion direction, the output of the discrimination signal detection circuit 18 resets the output of the flip-flop 68. In general, the Y signal reproduction output is more stable than the color signal reproduction output, and the reproduction error of the Y signal is corrected by the color discrimination signal superimposed on the line-sequential color signal.
Almost no color discrimination operation error occurs.

As described above, according to the present invention, the standard composite SECA
When a signal obtained by decoding the M signal is recorded on a magnetic medium by a line-sequential VTR, or when a line-sequential VT is recorded from the recorded magnetic medium
As shown in the case where a standard composite SECAM signal is obtained by a SECAM signal encoder by reproducing the synchronized R output, the first line-sequential signal is synchronized, and then line-sequentialized to another second signal. In a signal processing system for converting to a line-sequential signal, by using the control signal of the synchronizer at the time of synchronization as the control signal of the line-sequentializer, the inferiority of each horizontal scanning delay line in the synchronizer and each It is possible to provide a signal processing device that converts a video signal at the beginning of a field into a second line-sequential signal without loss.

Also, a standard composite from a television camera, etc.
When a signal obtained by decoding a SECAM signal or a Y, U, V signal from a television camera or the like is recorded / reproduced on the line-sequential VTR of the present invention, the television camera, SECAM signal decoder, V
Since all systems such as TR and SECAM encoders are line-sequentially synchronized, they are very useful, and at the same time, the output of the SECAM signal encoder is a standard composite SECAM signal. Furthermore, if the playback circuit of [Fig. 8] is used as the playback circuit of the VTR, a more stable standard composite SE can be obtained.
It can be said that it is a VTR system suitable for broadcasting equipment because it can send out CAM signals.

Further, in the Y-C separation type VTR as shown in the present invention, Y
A YC timing circuit is used to match the time axis of the reproduction output signal of the signal and the color signal.

In the present invention, since the horizontal synchronizing signal in the Y signal and the color discrimination signal of the color signal are superimposed at a fixed time and a fixed interval during recording, these two signals are reproduced in the Y-C timing circuit during reproduction. Can be used as a reference signal for Y-C timing for time-axis alignment of the Y signal and the color signal.

[Brief description of drawings]

FIG. 1 is a block diagram of a line-sequential VTR in one conventional example, FIG. 2 is a waveform diagram for explaining the operation of the VTR of FIG. 1, and FIG.
FIG. 4 is a block diagram of a SECAM signal decoder, FIG. 4 is a signal sequence diagram in each part of FIG. 1, FIG. 5 is a block diagram of a color video signal line sequential processing device in a first embodiment of the present invention, and FIG. Is a signal sequence diagram in each part of the apparatus of FIG.
FIG. 7 is a block diagram of a second embodiment of the present invention, and FIG. 8 is a second reproduction circuit diagram of the same device. 21,39 …… Synchronizer, 9,61 …… Line sequentializer, 40,41,16,17
…… FM demodulator, 8,20 …… Monostable multivibrator, 6
0,53 …… Flip-flop, 6,59 …… Horizontal sync signal detection circuit, 4,5,62 …… FM modulator.

Claims (3)

[Claims] 1. A synchronizer and a first controller for controlling the synchronizer based on a color discrimination signal included in a first line-sequential color signal, the synchronizer comprising: A line sequencer for converting a signal obtained by synchronizing the line-sequential color signals into a second line-sequential color signal and a second control device for alternately switching for each horizontal scanning line to control the line-sequentializer; Further, the color video signal line sequential processing device is characterized in that the second control device is controlled by the output of the first control device to match the color signal series of the first and second line sequential color signals. 2. The first line-sequential color signal is a standard composite SE.
The two color difference signals which are CAM signals and which are obtained by the SECAM signal decoder which decodes the SECAM signals are made into the second line-sequential color signals by the second control device and the line-sequentializer. The second control device is controlled by the output of the first control device, and the color signal sequence of the carrier color signal of the SECAM signal is matched with the color signal sequence of the second line-sequential color signal. 5. A color video signal line sequential processing device according to claim 1. 3. The first line-sequential color signal is converted to a SECAM signal (second line-sequential color signal) by a standard controller and a standard SECAM signal encoder. Furthermore, the output of the first control device controls the second control device in the SECAM signal encoder to generate the color signal series of the first line-sequential color signal and the color signal series of the second line-sequential color signal. The color video signal line sequential processing device according to claim 1, characterized in that they match.