JPS60196091A - Video signal transmission system - Google Patents

Abstract

PURPOSE:To eliminate the color noises of a fixed pattern produced on a screen and to disable detection of those noises by changing the transmission order of chrominance (color difference) signals for each frame. CONSTITUTION:The vertical synchronizing signal separated and delivered from a vertical synchronizing separator circuit 14 is supplied to an EO14 via FF16 and FF17. The EO15 delivers a line sequential switching signal which is inverted every H and every frame and supplies it to a control pulse generator 7 and a switch circuit 18. The circuit 18 delivers the color difference signals R-Y and B-Y supplied from a decoder 4 in the form of a line sequential color difference signal which is switched every H together with its transmission order switched every frame. Therefore the circuit 18 delivers the sequential color difference signals in the orde or R-Y, B-Y, R-Y - in the first frame and then in the order of of B-Y, R-Y, B-Y - in the 2nd frame respectively.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a video signal transmission system, and in particular, the luminance signal and color difference signal of a color video signal are compressed in time axis, and then time division multiplexed and A video signal transmission method used in recording and reproducing devices, etc., which modulates, records on a recording medium (for example, magnetic tape), and reproduces it. 1 = FM demodulates the frequency-modulated wave and then expands the time axis to obtain a reproduced color video signal. Regarding.

(Prior art) Current color video (word recording and reproducing devices (e.g. VTR)
) The mainstream recording and reproducing technology is (open format (for example, NTSC format) composite color projection, which largely separates luminance signals from color signals and other low-frequency conversion carriers,
The iY'li1q signal is frequency-modulated to become a −C frequency-modulated wave, and the carrier color signal is frequency-converted to a low frequency band and converted to a low-frequency conversion wave.
It is recorded as a Q3'A color signal by frequency division multiplexing on the above frequency modulated wave after Iζ, and during reproduction, recording 11.1, 11,
As is well known, this is a recording and reproducing apparatus using the so-called low-frequency conversion recording and reproducing method, which performs reverse signal processing and generates a composite color video signal 5 based on the original standard method.
A recording/playback device using such a low-frequency conversion recording/playback method is particularly suitable for use with consumer VTRs, where the band of the luminance signal can be arbitrarily selected, and the band that can be recorded and played back is relatively limited. , ■ The demodulated color signal is not easily affected by the reproduction time axis fluctuation of \/l'R, ■ Only the radiance 1 attenuation signal is involved in the FM modulation/demodulation system, and the pylon 1 - Since no signal is recorded or reproduced, there is less beat disturbance, and the following advantages include: (1) The frequency @ modulated luminance signal acts like a high frequency bias, and the transport port signal can be recorded with good linearity.

However, on the other hand, the above-mentioned recording device using the low frequency conversion recording and reproducing method is somewhat insufficient in achieving high image quality due to the limited recording and reproducing bands for luminance signals and carrier color signals.
The low-pass conversion carrier color signal is a balanced modulation wave when recording the NTSC color video signal, and AM noise in the reproduced low-pass conversion carrier color signal occurs due to uneven contact between the tape heads, resulting in S/N (signal to noise). (ratio) has worsened, and in addition, the two heads that record and playback the adjacent bidet numbers 1 to 3 are set at different azimuth angles, resulting in the absence of a guard band.
In recording and reproducing apparatuses that use the so-called azimuth recording and reproducing method that records and forms ranks, the azimuth loss effect is not sufficient for low frequencies. The issue is cross
During recording and playback,
The phase of the color subcarrier frequency of the low frequency conversion carrier color signal of the NTSC system is shifted by approximately 90 degrees in one horizontal scanning period (1H) (for example, Japanese Patent Publication No. 56-9073, Japanese Patent Publication No. 56-9073,
(Refer to Publication No. 5-32273), or it is necessary to perform crosstalk countermeasure processing such as reversing the phase of one low-frequency conversion carrier color of one of the adjacent video tracks for each tone. there were.

On the other hand, recent dramatic advances in semiconductor technology, precision processing technology, and small component technology have made it possible to improve the image quality and quality of recording and reproducing devices, and to make devices smaller and lighter. In order to reduce the size and weight of the device, reductions in power, reflex size, and drum diameter have a large impact, and in order to secure the necessary recording time for small cassettes, tape running must be slowed down.
In order to obtain high image quality in such a compact light chain recording and reproducing device, a new recording and reproducing method other than the above-mentioned low frequency conversion recording and reproducing method is required. reached.

Therefore, various recording and reproducing methods have been proposed to meet the above requirements, one of which is to compress the intercostal axis of two types of color difference signals obtained by demodulating the carrier color signal, and also to compress the luminance signal. The time axis is compressed, these signals are time-division multiplexed, and this time-division multiplexed signal is frequency-modulated and recorded on a recording medium. During playback, signal processing is performed in the opposite manner to that during recording, resulting in the original If method. There was a recording and reproducing device configured to obtain a reproduced output of a color video signal (for example, see Japanese Patent Application Laid-Open No. 53-5926).
. This recording/reproducing device takes into consideration the difference between the bands of the luminance signal and the color difference signal, and transmits the color difference signal, which is a signal with a narrower band, within the horizontal motion Ml erasure period. The - color difference signal transmitted within the 1 (-1) time axis is compressed to a period of about 20% of 1 (-1), and the luminance signal is compressed to the same degree as the time axis compressed color difference signal to be advantageous in terms of bandwidth utilization. Approximately 80% of the 1H period to occupy the band of
The two color difference signals are time-division multiplexed as line-sequential signals that are transmitted alternately every 1F, and this signal is supplied to an FM modulator.
A recording/reproducing method in which the output signal of a modulator is recorded on a magnetic tape, etc., and during playback, signal processing is performed in the opposite direction to that during recording to obtain a reproduced color video signal (hereinafter referred to as the time brex method). It was structured based on

According to the time-plex method for transmitting such time-division multiplexed signals, there is no period during which the luminance signal and the color difference signal are transmitted simultaneously. There is no mutual interference or moiré between the luminance signal and the color difference signal, which can occur when transmitting them by band-sharing multiplexing, and the N
In both cases of TSC color video signals, the azimuth recording and reproducing device records data in a direction perpendicular to the direction of the adjacent video tracks (track width direction).
Even if the horizontal synchronization signal is recorded on tracks that are not aligned in a so-called 1-aligned track, the time-division multiplexed signal is recorded on adjacent tracks due to high-frequency carriers with a large azimuth loss effect. Since it is obtained by frequency modulating the signal and recorded in the form of a frequency modulated signal, there is almost no crosstalk caused by the azimuth loss effect, eliminating the need for the above-mentioned crosstalk countermeasures, and achieving high playback image quality. is obtained.

Furthermore, both the time-domain compressed measurement signal and the time-domain compressed color difference signal in the time-plex method have an energy distribution in which the energy is large in the low frequency band and small in the high frequency band, and thus frequency modulation is performed. Since the signal form is suitable for the modulation index, it is possible to greatly improve the distortion S,'N, and when the time axis is expanded, it is possible to almost completely eliminate reproduction time axis fluctuations. From the above, the reproduced image quality can be significantly improved compared to that of the low frequency J-arrow recording and reproduction method.

(Problems to be Solved by the Invention) However, conventional time-plex recording and reproducing apparatuses, especially time-plex recording and reproducing apparatuses that record and reproduce NTSC video signals, record and reproduce NTSC composite video signals in low frequencies. Using a filter (hereinafter sometimes referred to as LPI), decoder, etc., the brightness level t shown in Fig. 1 (△) is
m (Y signal 3) component and one color difference signal (R-Y, [3-Y color difference signal) component shown in FIG. 1 (1'3) and (C), or luminance signal (Y signal) component and color signal (1, Q aunt) components, and these two types of color difference signal components are shown in Figure 1 (D).
The line sequential signal is transmitted alternately every day as shown in
Figure 1 (A> shows the indicated rating signal components at approximately 80% during the 1H1 period.
In order to identify the transmission line of the color signal, the line sequential color difference signal components shown in FIG. (E
). After adding pulse signals (achromatic signals) with different pulse widths and constant levels (achromatic levels) as shown in Figure 1 (F), time division multiplexing is performed.
) is transmitted as a timeplex signal and recorded and played back.

A schematic representation of the above transmission is shown in Table 1.

Table 1 is a diagram for explaining the transmission of a conventional time plex signal. Note that in Table 1, line indicates the order of scanning lines, and color signals are R-Y color difference signals (referred to as R in Table 1) and B-Y color difference signals. (denoted as B in Table 1), and polarity refers to the carrier wave of the carrier color signal (or the brightness fixed with the carrier wave of the carrier color signal).
This figure shows the phase of the luminance (high frequency component of No. iM) which is outputted to the color difference signal output terminal by 1!7 when the high frequency component of No. 711 is synchronously detected.

Further, as is clear from Table 1, line correlation is lost in the color difference signal components transmitted as line sequential signals. Furthermore, the luminance signal component f in the color difference signal B (removed is 13
P: Even with a comb filter, it is difficult and cannot be removed completely, and the luminance signal component remains in the color difference signal component.As a result, a fixed pattern of color noise is generated on the screen, which is very difficult to remove. I had a problem with Jja where the screen would go blank.

FIGS. 1(A) to 1([) are waveform diagrams for explaining the input signal 8 to the conventional time plex signal.

Therefore, the present invention proposes a video signal transmission method that eliminates the fixed pattern of color noise that occurs on the screen by changing the transmission order of color (color difference) signals for each frame, making it impossible to detect 15'6'J. Hinata is determined to provide the following.

(Means for solving the problem) In order to solve the above-mentioned problem, the present invention compresses the luminance signal component and the line-sequential color difference signal component of the color video signal in time axis, and then performs ■1 minute t! +! This is a video signal transmission method in which 1) color difference signal components are transmitted sequentially on line 0, and the order in which color difference signal components are transmitted is changed for each frame. l! This provides an image signal transmission system.

(Example) In explaining an example of the Eiden Igogo transmission system according to the present invention, an example in which the above system is applied to a recording/reproducing device will be shown in Figs. 2 (△) to (1) and This will be explained with reference to two people.

FIGS. 2 (Δ) to (1) are waveform diagrams for explaining one embodiment of the video signal transmission system according to the present invention. Also, the second
The table shows 31 actual IM examples of the video signal transmission system according to the present invention.
FIG. %J3, in Table 2, line indicates the order of scanning lines, and color signal indicates that the color difference signal is an R-Y color difference signal, so R is written in Table 2), and B-Y color difference signal. The polarity is the brightness of a nearly fixed pattern in the color subcarrier (if the brightness signal is output as a color difference signal when the high-frequency component of the moon is synchronously detected). Phase of high frequency component (or phase of color subcarrier)
is shown.

The color video signal 8 of the NTSC system (this is a composite video signal) is passed through the LPF, and the data 1-da cap is set at t6 as shown in Fig. 2 (Δ).
The luminance ε0' signal) component shown in Figure 2 (B) and (
(color difference) signal (R-Y, B-Y signals) component (or luminance signal (Y signal) component and color signal (1,
The two types of color difference signal (g) component are separated into the (Q signal) component), and these two types of color difference signal (g) component are placed in the first (first) frame.
As shown in the t52 table, (R-y,
smY.

If the luminance signal component shown in Fig. 2 (A) is compressed on the time axis into approximately 80% of the 111 periods, the result as shown in Fig. 2 (The line-sequential color difference signal components shown in D> are time-axis compressed to about 20% of the 111 periods,
After adding an achromatic signal such as the one shown in FIG. 2(E), it is time-division multiplexed and transmitted as a time plex signal as shown in FIG. 2(E). M
This is the same as the time-plex method described in the section ``Issues to be resolved'' with reference to FIGS.

In the next (second) frame, the line-sequential color difference signal is
As shown in Figure (G) and Table 2, the first
), the transmission order (B-Y,
(in the order of RY, B-Y, ...) as a line-sequential color difference signal,
Hereinafter, similarly to the first (first) frame, the luminance signal components shown in FIG.
1. In addition to the 1-axis compression, the line-sequential color difference signal components shown in FIG. After adding an achromatic signal, the signal is time-division multiplexed and transmitted as a time plex signal as shown in FIG. 2(I).

The next (third) frame is then transmitted in the same way as the first frame.

If the color difference signal is transmitted as a line sequential signal whose transmission order is changed for each frame as described above, as is clear from Table 2, a luminance signal with an almost fixed pattern of color subcarriers will be transmitted for each frame. The high-frequency components are synchronously detected and the phase of the high-frequency components of the luminance signal (or (the phase of the chromatic subcarrier)) of the luminance signal obtained as a color signal is inverted and transmitted, so the color of the fixed pattern described above is transmitted. The noise is canceled out and becomes 1 without being 1.
.

, LJ7Cn'i2L' 0>, -IM(!-m3°.

I will explain with reference to 1. FIG. 3 shows a block system diagram of an example of a recording and reproducing apparatus using a large-scale embodiment of the video transmitter 8 transmission type according to the present invention.

First, the operation during recording will be explained. In FIG. 3, for example, an NTSC color video signal (this is a composite video signal) inputted to an input terminal 1 is passed through a low-pass filter 3 through a switch circuit 2 which is switched to the terminal R side.
is supplied to , and here the luminance No. 15 is divided by N1, while
7' - The decoder supplied to the decoder 4 is a bandpass filter (
Illustration 1. ! ! From the NTSC color video signal, the carrier color A 50 is separated and extracted as a quadrature two-phase modulated wave (not shown in Figure 3).
Then, the color difference signals (R-)/) and (B-)/) (or (or)) are separated and output.

On the other hand, the low-pass filter 3 separates the input NTSC color video from IJ! , : The bright signal g is taken out, and this bright signal is sent to the synchronous separation 1 circuit 6, and the synchronization signal is separated and extracted. % and then supplied to random access memories (RAM) 8 and 9 in bulk. The control pulse generator 7 is supplied with a synchronous ratio 11 circuit 6J and a synchronous signal 8, and is supplied with a line order; By the above signal, AD converter 194 5°20, switch circuit 10
．． 12, supplies the generated control pulses to the DA converters 11' and 23, and also generates horizontal synchronizing signals and various pulses with a width of approximately 4.8 μs, and further supplies the RAM 8. ．． 9 and 2
The output clock and the read clock are respectively generated and outputted at predetermined timings and at a predetermined repetition frequency.

That is, the control pulse generator 7 uses the RAM 8
For example, a 16.11 MHz write clock pulse is supplied to one of the RAMs 1 and 9, and a luminance signal of 11-1 minutes, which is transmitted in a video period of 63.56 μs, is sent to one of the RAMs. 1 o'clock, for example 20.14 MI
The NZ readout clock pulse is set for 1H (63,56μs) for a period excluding the horizontal synchronization signal and the serial transmission period of the partial axis compressed color difference signal of 114 minutes, which will be described later, from the 1H1 period.
Immediately after the transmission of the 0.1 interval compression color difference, the other R
The other R is supplied to the AM, and the brightness for 1H1 of the previous 1H (ff1) stored in the AM is read out.This RA
11-1 What are the read and write operations of M8 and 9?
The switch circuit 10 on the output side of the RAMs 8 and 9 selects the output signal of the RAM 8 or 9 on the side performing the read operation by the control pulse from the control pulse generator 7. 1H, the time-base compressed luminance signal is intermittently extracted from the switch circuit 10 during 80% of the 1H period without missing any information. This time-base compressed luminance signal is subjected to resolution-to-analog conversion by a DΔ converter 11J and then supplied to a switch circuit 12.

The synchronization signal separated by the synchronization separation circuit 6 is supplied to a flip-flop circuit (hereinafter referred to as FF) 13 and a vertical synchronization separation circuit 14.

[13 is a synchronization separation circuit 6J, which is operated by a horizontal synchronization signal from which J and equivalent pulses are removed from the supplied synchronization signal. It is supplied to the circuit (J, EO, J) 15.

The vertical synchronization separation circuit 14 separates a vertical synchronization signal from the synchronization signal supplied by the synchronization separation circuit 6 and outputs it. The vertical synchronization signal separated and output by the vertical synchronization separation circuit 14 is an FF
1[3, supplied to [O15 via FF17.

Therefore, the EO 15 outputs a line sequential switching signal which is inverted to Hfa and which is inverted for each frame.

This line sequential switching signal is the controller 1-roll pulse generator 7.
and is supplied to the switch circuit 18.

When the switch circuit 18 outputs the color difference signals R-Y and B-Y supplied from the decoder 4 as a line-sequential color-difference signal that can be switched for each H, a line-sequential color-difference signal whose transmission order is switched for each frame is output. Output as .

Therefore, in the first (first) frame from the switch circuit 18, [
-Y, B-Y, R-Y, . . . color difference signals are sequentially output in the order of
G) and as shown in Table 2, ZJBY, RY, [3Y, ・
=(Dk1 order (DvAk primary color difference signal is output.

The line-sequential color difference signal outputted from the switch circuit 18 is supplied to the AD transformer 20 via the switch circuit 19 which is switched to the terminal R side.

On the other hand, the line sequential color difference signal output from the switch circuit 19 is analog-to-digital converted by the AD converter 20 and then supplied to the RAIVI 21. RAM21 is IH
(G3, 56 μs), the line-sequential color difference signal transmitted during the 53 μs video period is input to the controller 1 to the roll pulse generator 7J by input and output clock pulses of, for example, 4.03 to ll-1z. , After a certain period of time (for example, 1.611 s) after the end of writing, the time-axis compressed color difference signal is read out during 20% of the 1H period using a 20.14 MHz read clock pulse (-T)° (therefore, , one read period is 10.3 μs).

The time-base compressed line sequential color-difference signal read out from the RAM 21 is supplied to the A converter 23 via the switch circuit 22, digital-to-analog converted by the DA converter 23, and then sent to the switch circuit 12. Supplied. Note that during recording, the switch circuit 22 is switched so as to supply only the time-base compressed line-sequential color difference signal read out from the RAM 21 to the DA converter 23.

The switch circuit 12 receives the above-mentioned time-base compressed luminance signal and the approximately 4.8μ signal extracted from the control pulse generator w7.
s width horizontal synchronization signal and the output of the above device 7 1-
Based on the roll pulse, time-division multiplexing and switching are performed. The time-division multiplexed signal extracted from the switch circuit 12J is supplied to the discrimination timing signal addition circuit 24, where it is processed by the discrimination timing signal generator 25 based on the output control pulse of the control pulse generator 7. The generated discrimination timing multiplication amount is added by 1. This determination timing signal (A
The timing signal (Tick signal) is a timing signal for determining the transmission line of the color difference signals R-)' and B-Y. A pulse f88 of a constant level (achromatic level) with different pulse widths is added to the pulse f88.

In this way, when an NTSC color video signal is input to the input terminal 1, the discrimination timing signal adding circuit 24 outputs the signal as shown in FIG. 2(E)': 4. or Figure 2 (1")
As shown in , a timing signal for different pulse width discrimination is superimposed on each IH (63, 56 μs), and a horizontal synchronization signal, time axis compression color difference @ one of R-9 or B-Y, and a time axis The compressed luminance signals are time-division multiplexed, and the time-axis compressed color difference signals are extracted as time-division multiplexed signals that are transmitted line-sequentially as shown in FIG. 2(F) or FIG. 2(I). This time division multiplexed signal is processed by a pre-emphasis circuit 2G, a white peak level clip circuit 27, a clamp circuit 28. FM modulator 29. High pass filter 30
and i′iil! Recording amplifier 31J: In a recording/reproducing apparatus such as a VTR, the signal is supplied to the recording head 32 through a known recording signal processing circuit, and thereby recorded on the magnetic tape 33.

Next, the operation during reproduction will be explained. At this time, the switch circuit 2.19 is connected to the terminal P side. The reproduction head 34 reproduces the time-separated signal m recorded on the magnetic tape 33 in the form of a frequency-modulated wave, and this reproduced frequency-modulated wave is subjected to reproduction amplification r535. Equalizer 36. The signal is passed through a known reproduction signal processing circuit comprising a high-pass filter 37° FM demodulator 38 and a de-emphasis circuit 39 to produce a regenerative time division multiplexed signal as shown in FIG. 2(F)- or FIG. 2(1). This reproduced time-division multiplexed signal passes through a switch circuit 2 and a low-pass filter 3 connected to a terminal P, respectively, to an AD converter 5. The synchronization separation circuit 6° is supplied to the timing signal detector 42, and the AD'a pincer weapon 20 is supplied through the switch circuit 19 connected to the terminal P.

AD converter5. RAM8 and 9. A circuit section consisting of a switch circuit 10 and a DA converter 11 generates a reproduced signal whose time axis is extended and returned to the original time axis based on the output signal of the control pulse generator 7. generate. Here, one of RAM8 and RAM9 is ``.

``When a write operation is being performed for the time axis compressed signal 1 of the reproduction time division multiplexed signal, the other memory card performs a read operation, and RAMs 8 and 9 perform read and write operations alternately every 11''. The operations are the same as during recording, but unlike during recording, the repetition frequency of the write clock pulse is, for example, 20.14 MHz, and the repetition frequency of the read clock pulse is, for example, 1 MHz.
6.11 MHZ, therefore, the reproduction luminance signal power whose time axis has been expanded in the 11-1 period (that is, the time axis has been compressed or expanded by 1) is switched from the RAM 8 and O to the switch circuit 10 alternately every 1 to 1. is retrieved via. The digital signal of the reproduced luminance signal taken out from the switch circuit 10 is D.
After being subjected to γ-cital-to-analog conversion in the A converter 11, it is supplied to the mixing circuit 40.

On the other hand, the AD converter 20. The circuit section consisting of RAM21 is
After writing the axis compressed color difference signal between 8 and r in the reproduced time division multiplexed signal into the RAM 21 based on the output j signal of the device 7, a read operation is performed to return the time axis to the line sequential color difference signal. Get a signal. Then, the RAM 21 outputs a digital signal based on the playback time axis pressure line color difference using the input/output clock pulse of, for example, 20.14 Ml-1z if! i! The digital signal of the reproduction line sequential color difference signal whose time axis has been expanded five times and whose time axis has been restored is read out using a readout clock pulse of 4.03MH7.

The digital signal of the reproduced line sequential color difference signal read out from the RAM 21 is supplied to the switch circuit 22 and the RAM 41.

In the NTSC color video signal, color difference signals R-Y,
Since both B and Y are required, a color difference signal of a different type from the color difference signal read out from the RAM 21 is written in the RAM 41 at υ, and the signal is stored in the RAM 41 as soon as the output signal from the control pulse generator 7 is received. - Read out the input color difference signal and supply it to the switch circuit 22.

Further, the timing signal detector 42 detects the discrimination timing signal from among the supplied reproduced line sequential color difference signals and supplies it to the switch circuit 22.

The switch circuit 22 detects f! of the color difference signal read out from the RAM 21 based on a signal supplied from the timing signal detector 42. Class Ii is identified and the supplied R-)/color difference signal read out from the RAM 21.41 is sent to the DA converter 23.
, the B-Y color difference signal is supplied to the DΔ transformer 43.

The digital signal of the color difference signal B supplied from the switch circuit 22 is converted into a reproduction line sequential color difference signal by the DA converters 23 and 43, respectively, and then supplied to the encoder 44.

The encoder 44 performs quadrature two-phase modulation on the reproduced color difference signals R-Y and B-Y to obtain a quadrature two-phase modulated wave, and further outputs a horizontal synchronization signal of the quadrature two-phase modulated wave and a horizontal synchronization signal of the quadrature two-phase modulated wave, and The transmission of the quadrature two-phase modulated wave is interrupted, and a carrier color signal that is a quadrature two-phase modulated wave conforming to the NTSC system is generated.

The reproduced carrier color signal based on the NTSC system taken out from the output terminal of the encoder 44 is supplied to the mixing circuit 40 shown in FIG. After being mixed with the synchronizing signal from the generator 7 and converted into a reproduced color video signal compliant with the NTSC system, the signal is output to the output terminal 45.

According to this embodiment, the readout clock pulse frequency is set to a constant frequency during playback, and the input/output side clock frequency is made to completely follow the jitter, so that the playback time axis fluctuation (jitter) is reduced to the time axis. It can be removed at the same time as it is stretched.

(Effects of the Invention) Since the present invention is as described above, it has the advantage that fixed pattern color noise caused by the high-frequency component of the luminance signal remaining in the color difference signal can be canceled out and cannot be detected. do.

[Brief explanation of the drawing]

Figures 1 (A) to (E) are waveform diagrams for explaining the signals involved in the conventional time-plex system, and Figures 2 (A) to (E)
1) is a waveform diagram for explaining an embodiment of the video signal transmission method according to the present invention, and FIG. 3 is a block system of an example of a recording/reproducing device using an embodiment of the video signal transmission method according to the present invention. It is a diagram. 4... Decoder, 6... Synchronization separation circuit, 7... Control pulse generation circuit, 13, 1t3.17...
Flip-flop circuit (F"), 14... Vertical synchronization separation circuit, 15... Exclusive OR circuit (EO), 18,
19.22... Switch circuit, 20... AD converter, 21, 41... RAM, 23.43... DA converter, 40... Mixing circuit, 44... Encoder. 01j 20 Procedure Neichi Seiko 1 (Method) Patent Office Commissioner Shiga Manabu 1, Indication of the case 1988 Special ¥ [Application No. 53147 2, Title of invention Video signal transmission method 3, Person making amendment case Relationship with Patent Applicant Address: 3-12 Moriya-cho, Kanayō-ku, Yokohama-shi, Kanagawa Prefecture Name (432) Victor Company of Japan Co., Ltd. June 26, 1980 (Shipping date) " Figure 1 (A) to (E)
is corrected as "Fig. 1 Δ) to (F)".

Claims (1)

[Claims] A video signal transmission method in which a luminance signal component and a line-sequential color-difference signal component of a color video signal are time-base compressed and then transmitted as a time-division multiplexed signal, the method comprising: A video signal transmission method that changes the transmission order for each frame.