JPS6276983A - Formation of high definition television signal - Google Patents

Abstract

PURPOSE:To eliminate the need for a motion detection circuit at a receiving side and to reduce the cost of a television receiver by performing the motion detection at a sending side and overlapping and sending in a compound video signal as a separation control signal for a signal Y and a signal C. CONSTITUTION:At the sending side,a difference between the compound video signal of one frame before and an inputted compound video signal is detected at a motion detector 2, being supplied to a code converter 4 as a motion quantity. At the code converter 4, it is encoded by every mXn number of blocks, n-number of blocks in a horizontal direction and m-number of blocks in a vertical direction on a display plane, and is supplied to an overlapping apparatus 5 as the separation control signal for the signal Y and the signal C. At the receiving side, a signal separated at a frame Y/C separator and the signal separated at a line Y/C separator are mixed corresponding to the separation control signal. And obtained signals Y and C are added to a display device as various kinds of chrominance signals and a high definition picture is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a high-definition television set in which a television receiver separates a brightness signal and a color signal according to movement using a separation control signal on the sending side to reduce interference between the two signals. This invention relates to a method of forming a John signal.

Conventional technologyCurrent NTS C (National
ision SystemComm it tee
) method, as shown in Fig. 4, a luminance signal (hereinafter abbreviated as Y signal) and a color signal (hereinafter abbreviated as C signal) obtained by modulating the color subcarrier fsc are frequency-multiplexed and sent. When playing images on a television receiver, the Y signal and C signal are separated by # (this is called Y/C separation).
After that, color demodulation must be performed and displayed on the screen. Conventionally, this Y/C separation converts the detected video signal into an analog C signal BPF (Band Pa5
sFilter Low-pass filter (hereinafter abbreviated as BPF). ) to extract the C signal, while the Y signal is passed through an analog LPF (Low Pa5s Fil
ter Low pass filter 23 or less abbreviated as LPF. ) by Y
Y/C separation was performed by extracting the signal.

However, with this method, cross color (a phenomenon in which the Y signal leaks into the C signal and is demodulated and becomes colored) and cross luminance (a phenomenon in which the C signal leaks into the Y signal and makes dot crawl visible) occur, resulting in interference. This results in a screen that is difficult to see. Recently, in order to solve the above problem, Y/C using interline correlation (correlation between upper and lower horizontal scanning lines)
A separation method (line < shi) has been proposed and put into practical use, and image quality has improved. However, according to the Y/C separation using the line comb, the above problem cannot be clearly detected in the image quality of moving images due to blurring due to movement, but the image quality of still images is Y/C as shown in Figure 4 (bl). contains sideband components in horizontal scanning frequency units of each signal, so in principle complete Y/C separation cannot be performed, so the above problem has occurred, although to a lesser extent.Therefore, recent television receivers digitization and improvements in memory technology have enabled frame-to-frame correlation using memory for still images and line-to-line correlation for moving images.
As shown in FIG. 4(C), 1. C Completely separate each signal. ), Y depending on the movement of the object using the line comb
A motion-adaptive Y/C separation method that performs Y/C separation has been proposed. (For example, Yukihiko Achiba et al., “Proposal of a motion-adaptive shape-quantity refinement conversion method for color television signals,” National Conference of the Society of Television Engineers 7-2. p, p, 147-148 1
982). ) The motion adaptive Y/C separation described above detects the difference between frames as motion, and performs Y/C separation using a line comb for moving parts and a frame comb for non-moving parts (no difference). This is a method of implementing this, and the reproduced image can be of high quality with very little interference.

Problems to be Solved by the Invention However, since the above method performs motion detection, 1.
This required a frame's worth of memory and peripheral circuitry, and had problems such as making the television receiver quite expensive.

The present invention has been made in view of the above, and it is an object of the present invention to provide a high-definition television system that performs motion-adaptive Y/C splitting that does not require a motion detection circuit.

Means for Solving the Problems In order to solve the above problems, the present invention provides n blocks in the horizontal direction and m blocks in the vertical direction of the display screen of the television receiver.
The present invention provides a method for forming a high-definition television signal in which a separation control signal for separating a luminance signal and a chrominance signal for each m x n Boolock block is superimposed on a composite video signal.

Effect of the Invention With the above-described configuration, the present invention extracts the separation control signal for Y/C separation of m×n broncs superimposed on the composite video signal on the sending side on the receiving side and uses it as the motion detection signal. , mainly selects frame combing for static parts and line combing for moving parts according to the separation control signal of each (m, n) block, and performs the same operation as the motion-adaptive Y/C separation, thereby eliminating interference. Get good quality images.

Embodiment FIG. 1 shows a waveform of a high-definition television signal format in a first embodiment of the present invention.

In the figure, (8) shows, as an example, the separation control signal superimposed on two horizontal scanning periods within the vertical blanking period of the composite signal (image signal), and (b) shows each signal in detail. The waveform is shown. In the figure, the number in al is the number of the horizontal scanning line (()
The number in parentheses in (b) is the number of the next field), and the number in parentheses in (b) is the number of the separated control signal in the horizontal direction of the display screen of the television receiver according to the first embodiment of the present invention shown in FIG. The following shows the order in which blocks are transmitted in units of blocks, each block consisting of m x n blocks in the vertical direction.

FIG. 3 shows a block diagram of an example of a transmitting/receiving system using high-definition television signals in the first embodiment of the present invention. Each configuration is shown in FIG.
1 is a code converter that encodes the signal from the motion detection section, 5 is a superimposition device that superimposes a code on the composite video signal, 6 is a composite device (image signal output terminal, and 11 is a composite video signal on which the separated control signal is superimposed) 12 is a frame Y/C separator using a frame memory, 13 is a line Y/C separator using a line memory, 14 is a composite device, and 15 is a Y signal mixer. 16 is a C signal mixer, 17 is a Y signal output terminal, and 18 is a C signal output terminal.

An example of the high-definition television signal format and transmission/reception system of the present invention configured as described above will be explained.

The composite video signal obtained from a camera or the like on the sending side is input to the composite video signal input terminal 1 in FIG. The difference between the previous composite video signal and the input composite video signal is detected and supplied as a motion amount to the code converter 4. In the code converter 4, the output of the motion detector 2 is shown in FIG. The code is encoded every m x n blocks (n blocks in the horizontal direction and m blocks in the vertical direction) on the display screen as shown in FIG. The composite video signal added to the memory 3 has one field (1
/60 seconds), and in the superimposition device 5, the code converter 4
For example, as shown in FIG. 1, the separated control signals from the field are clock synchronized in consideration of signal extraction during playback within an arbitrary horizontal scanning period within the vertical blanking period of the composite video signal. After adding a signal (a signal for obtaining the phase of the reproduced sampling clock) and a byte synchronization signal (a signal that determines the beginning of the separation control signal), the (m
, n) and sent out as a composite video signal from the composite video signal output terminal 6.

On the receiver side, the composite video signal on which the separation control signal has been superimposed is subjected to video detection and inputted to the composite video signal input terminal 11 in FIG. '/C separator 13 and compounder 14, respectively. The frame Y/C separator 12 uses a frame comb to separate the frequency-multiplexed Y signal and C signal from the composite video signal every 1/30 seconds, sends the Y signal to the Y signal mixer 15, and sends the C signal to the Y signal mixer 15. C signal mixer 16.

The line Y/C separator 13 uses a line comb to separate the Y signal and C signal that are frequency multiplexed every 1/(30X525) seconds from the composite video signal, and sends the Y signal to the Y signal mixer 15, and then sends the Y signal to the Y signal mixer 15. The signal is supplied to a C signal mixer 16. The composite device 14 converts the separation control signal superimposed on the vertical blanking period shown in FIG. 1 from the composite video signal into a separation control signal using the clock synchronization signal and byte synchronization signal shown in FIG. The Y signal mixer 15 and the C signal mixer 16
supply to. Y signal mixer 15 and C signal mixer 1
6 mixes the frame Y/C separated signal and the line Y/C separated signal according to the separation control signal, sends the mixed Y signal to the Y signal output terminal 17, and sends the C signal to the C signal. Output to the output terminal. Y, C obtained in this way
The signals are converted and applied to a display device as various color signals to display a high-definition image.

As described above, according to this embodiment, in the television system, motion detection is performed on the sending side, and this is detected between the Y signal and the C signal.
Separation of signals As a control signal, the composite video signal is sent superimposed in n blocks horizontally and m blocks vertically on the display screen of the television receiver, and the receiver is placed on the side. Extract the separation control signal and convert it to Y
As described in detail, according to the present invention, motion detection is performed on the sending side to separate the Y signal and the C signal, thereby eliminating the need for a motion detection circuit in the television receiver. By superimposing and transmitting the C signal as a separate control signal in the composite video signal, a motion detection circuit on the receiving side is not required, and the cost of the television receiver can be reduced considerably, which has great industrial value. .

[Brief explanation of drawings]

FIG. 1 is a waveform diagram of a high-definition television signal format in the present invention, FIG. 2 is a schematic diagram of an example of the configuration and correspondence of a separation control signal on a display screen in the present invention, and FIG. 3 is a waveform diagram of a high definition television signal format in the present invention. A block diagram of a high-definition television system according to an embodiment,
FIG. 4 is a frequency spectrum diagram showing the frequency relationship between the Y signal and C signal of the current television system. 2... Motion detector, 3... Field memory, 4... Code converter, 5... Superimposition device, 12... Frame Y/C separator, 13.
... Line Y/C separator, 14 ... Decoder, 15 ... Y signal mixer, 16 ...
C signal mixer. Name of agent Patent attorney Toshio Nakao 1 person Figure 1 Cβ--Ittou-Perspective F-4 Divination Figure 2 Figure 3 (α) (shi)

Claims (1)

[Claims] A high-definition television in which a separation control signal that separates a luminance signal and a color signal for each m×n block of n blocks in the horizontal direction and m blocks in the vertical direction on the display screen of a television receiver is superimposed on the composite video signal. How to form a John signal.