JPS6276981A - 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 on and sending to a compound video signal as the separation control signal of 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 using a motion detector 2, being supplied to a code converter 4 as a motion quantity. The code converter 4 encodes the output of the above stated motion detector 2 and supplies it to an overlapping apparatus 5 as the separation control signal of the signal Y and the signal C. At the receiving side, the compound video signal on which the separation control signal is overlapped is video- detected, being added on a frame Y/C separator 12, a line Y/C separator 13 and a decoder 14 respectively. A signal Y mixer 15 and a signal C mixer 16 mix a signal separated at the frame Y/C separator and the signal separated at the line Y/C separator corresponding to the separation control signal, and they are added on a display device as various kinds of chrominance signals, a high definition picture being 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 technology Current NTSC (National Teledevice)
sion SystemComm it tee)
In the television system, as shown in Figure 2, a luminance signal (hereinafter abbreviated as Y signal) and a color signal (hereinafter abbreviated as C signal) obtained by modulating the color subcarrier wave fsc are frequency multiplexed. Therefore, when playing an image on a television receiver, the Y signal and C signal must be separated (this is called Y/C separation) and then color demodulated before being displayed on the screen. It won't happen. Conventionally, this Y/C separation is performed by converting the detected video signal into an analog C signal BPF (Band
Pa5s Filter Low-pass filter (hereinafter abbreviated as BPF). ) to extract the C signal, while the Y signal is analog L P F (Low Pa5s Fi
l-ter Low-pass filter (hereinafter abbreviated as LPF). ) to perform Y/C separation by extracting the Y signal. However, according to this method, cross color (Y
A phenomenon in which the signal leaks into the C signal and is demodulated and becomes colored),
Cross luminance (a phenomenon in which the C signal leaks into the Y signal and a dot crawl appears) occurs, resulting in a screen that is difficult to see due to interference. Recently, in order to solve the above problem, Y
A /C separation method (line < C) 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 in the image quality of still images, Y/C separation as shown in Figure 2 (1)) Since sideband components of the C signal and Y signal are included in each horizontal scanning frequency unit of each C signal, complete Y/C separation cannot be performed in principle, so the above-mentioned problem has occurred, although to a small extent.

Therefore, with the recent digitization of television receivers and improvements in memory technology, frame-to-frame correlation using memory is used for still images, and line-to-line correlation is used for moving images. c), a motion-adaptive Y/C separation method has been proposed in which Y/C separation is performed according to the movement of an object using a line comb.

(For example, see Yukihiko Achiba et al., "Proposal of a motion-adaptive high-definition conversion method for color television signals, (Television Society National Conference 7-2. p, p. 147-148, 1982).") The motion adaptation described above. For example, type Y/C separation is a method in which the difference between frames is detected as movement, and Y/C separation is performed by using a line comb for moving parts and a frame comb for parts without movement (no difference). The reproduced image is of high quality with very little interference.

Problems to be Solved by the Invention However, in order to perform beam detection using the above method,
This required memory and peripheral circuitry for about one frame, and had problems such as making the television receiver quite expensive.

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

Means for Solving the Problems In order to solve the above problems, the present invention superimposes the motion detection signal on the sending side into a composite video signal as a separation control signal for separating a luminance signal and a color signal. The receiver uses the separation control signal extracted from the composite video signal to separate and display frequency-multiplexed luminance signals and color signals in the composite video signal according to movement. .

Effect of the present invention With the above-described configuration, the separation control signal for Y/C separation superimposed on the composite video signal on the sending side is extracted on the receiving side and used as the motion detection signal, and the still part is divided into frames ( For the video portion, lines are mainly selected and the same operation as the motion adaptive Y/C separation is performed to obtain a high-quality image without interference.

Embodiment FIG. 1 shows a block diagram of a high-definition television system according to a first embodiment of the present invention. 1
In the figure, 1 is a composite video signal input terminal, 2 is a motion detector, 3 is a field memory, 4 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 video signal output terminal, 11 is a composite video signal input terminal into which the composite video signal superimposed with the separation control signal is input, 12 is a frame Y/C portion R2'A using a frame memory, I3 is a line A line Y/C separator using memory, 14 a composite device, 15 a Y signal mixer, 16 a C signal mixer, 17 a Y signal output terminal, and 18 a C signal output terminal.

A high-definition television system according to an example of the present invention configured as described above will be explained.

A composite video signal obtained from a camera or the like on the sending side is input to a composite video signal input terminal 1 shown in FIG. The motion detector 2 detects the difference between the composite video signal of one frame before and the input composite video signal, and supplies it to the code converter 4 as a motion amount. A code converter 4 encodes the output of the motion detector 2 and supplies it to a superimposition device 5 as a control signal for separating Y and C signals. On the other hand, the composite video signal added to field 1-memory 3 is 1 field (
1/60 seconds), and in the superimposing device 5, the separated;b control signal from the code converter 4 is superimposed on a field-by-field basis, and then sent out from the composite video signal output terminal 6 as a composite video signal.

On the receiving side, the composite video signal on which the separation control signal is superimposed is subjected to video detection and inputted to the composite video signal input terminal 11 shown in FIG. 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. The Y signal is supplied to the Y signal mixer 15, and the C signal is supplied to the C signal mixer 16.In the line Y/C separation 2H13, the composite video signal is frequency-multiplexed every / (30X525) seconds using a line comb. The separated Y signal and C signal are separated, and the Y signal is supplied to a Y signal mixer 15 and the C signal is supplied to a C signal mixer 16. The signal is extracted and supplied to a Y signal mixer 15 and four C signal mixers.The Y signal mixer 15 and C signal mixer 16 separate the frame Y/C separated signal and the four C signal mixers according to the separation control signal. The signals separated by line Y/C are mixed, and the mixed Y signal is output to the Y signal output terminal 17, and the C signal is output to the C signal output terminal.The Y and C signals obtained in this way are converted into The signals are then added to the display device as various color signals, and a detailed image is displayed.

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.
A signal separation control signal is superimposed on a composite video signal and sent, and the receiving side extracts the separation control signal and sends it to Y.
By using it to separate the signal and the C signal, a motion detection circuit in the television receiver becomes unnecessary.

As described in detail, according to the present invention, the sending side performs motion detection and separates the Y signal and C signal and sends out the separated control signal and superimposes it on the composite video signal. Since a motion detection circuit is not required, the cost of the television receiver can be reduced, and its industrial value is great.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a high-definition television system according to an embodiment of the present invention, and FIG. 2 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

Claims (1)

[Claims] A sending side superimposes a separation control signal for separating a luminance signal and a color signal into a composite video signal and sends it, and a receiving side uses the separation control signal extracted from the composite video signal to generate the composite video signal. A method of forming a high-definition television signal that separates and displays frequency-multiplexed luminance signals and color signals in the signal.