JPH027689A - Color signal processing circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for changing the color of any part of a video signal reproducing device such as a VTR or video disc player.

[Prior Art] When playing back a video, graphic controls are used to add color to the necessary areas, erase text, or add markers to some of the text. When recording onto tape, the video signal itself was changed, and it was not possible to control it on the playback side.

[Problems to be Solved by the Invention] All information regarding graphic controls is recorded on the videotape or video disc from the beginning, so when these are played back, the playback side has to change colors, change the way markers are displayed, etc. I can't do it at all.

[Means for Solving the Problems] In the present invention, when recording a video signal, a color signal control signal is mixed in advance with a signal that is repeated during a vertical retrace period, and the playback side plays back this video signal. , extracts the control signal of the color signal, generates a pulse to switch the color signal at a necessary location from the extracted control signal, and converts the color signal from the back color signal generation circuit generated on the playback side to the color signal from the video signal. By switching to , you can change the color where necessary.

[Function] With the above configuration, according to the present invention, the control signal of the color signal can be extracted on the playback side and graphic control can be performed when necessary.

[Example] FIG. 1 is a block diagram of one embodiment of the present invention.

The present invention can be used in various educational or entertainment devices, but in this embodiment, the background of the lyrics caption that appears on the television screen changes color depending on the song being sung. The graphic controller will be explained.

FIG. 2 is a waveform diagram showing a vertical retrace period of a typical video signal. This waveform diagram shows a vertical retrace period between an even field and an odd field, and as shown in the figure, there is a period equivalent to about 15 horizontal synchronizing signals.

The symbol 1°2 above the horizontal synchronizing signal pulse shown in the figure
...11, 12, etc. indicate the order of the 14th water signal pulse from the start of the vertical retrace period. In this figure, for example, data indicates the position where the horizontal chromaticity adjustment is to be performed during the period of the 8th horizontal synchronization signal, and data indicating the position where the vertical direction chroma adjustment is desired to be performed during the period of the 9th horizontal synchronization signal. Data and basic data necessary to perform graphic control such as start, stop, and reset of chromaticity during the period of the 10th horizontal synchronization signal are input in advance to a recording medium such as a videotape or a video disc.

Since the field appears 60 times per second, the vertical Jn+gland phase opening period is 0 times, and it is possible to record fairly accurate chromaticity data.

FIG. 1 shows a graphic control circuit on the playback side for playing back such a recording medium. In FIG. 1, the output from a video signal output circuit 1 is supplied to a Y/C separation circuit 2, and the Y (luminance) signal is supplied to a data extraction circuit 3 and a Y/C mix circuit 9. C (chroma) signal is PLL
The signal is supplied to the circuit 6 and the chroma signal switching circuit 8. The signal supplied to the PLL circuit 6 generates a back color in a back color generation circuit 7, and the back color is supplied to a chroma signal switching circuit 8. The data extraction circuit 3 extracts the graphic control data mixed in the periods of the 8th, 9th, and 10th horizontal synchronization signals, controls the CPU 4 using the data, and adjusts the chromaticity of the television screen. Generate a position signal. CPU
In 4, based on this graphic control data,
If necessary, each pulse in the horizontal and vertical directions of the television is reproduced and inputted to an AND circuit 5 for synthesizing a chroma signal switching pulse. The PLL circuit 6 generates a signal synchronized with the reproduced chroma signal of 3.58 MHz, and based on the 3.58 MHz signal synchronized with the reproduced chroma signal, this PLL circuit generates a background color to be inserted in the background of the lyrics caption. A signal is generated in the back color generation circuit 7. By switching the back color signal created as described above in the chroma signal switching circuit 8 using a switching pulse output from the AND circuit 5, Y/
The chroma signal from the C separation circuit 2 is switched to the chroma signal from the back color generation circuit 7, and the chromaticity change of the background of the lyrics telop can be seen. The chroma signal from the chroma signal switching circuit 8 is the Y signal from the Y/C separation circuit 2, and the Y/C
The mix circuit 9 mixes the signals again and displays them on the television screen. The CPU 4 can also change or correct the colors generated by the back color generation circuit 7.

[Effects of the Invention] According to the present invention, it is possible to change the color, add or delete a marker at a necessary location of the information reproduced on the television screen under the control of the CPU. You can freely control the screen graphics.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a waveform diagram of a vertical blanking period of a video signal. DESCRIPTION OF SYMBOLS 1... Video signal output circuit, 2... Y/C separation circuit, 3... Data extraction circuit, 4... CPU, 5...
...AN0 circuit, 6...PLL. ...Back color generation circuit, 8...Chroma signal switching circuit, 9...Y/C mix circuit. Figure 1 Figure 2

Claims (1)

[Claims] means for reproducing a video signal in which a color signal control signal is mixed with a signal repeated during a vertical retrace period; means for extracting a color signal control signal from the video signal; and means for processing the extracted control signal. A color signal processing circuit comprising means for generating a switching pulse, a back color signal generation circuit, and means for switching between a color signal from the video signal and a color signal from the back color signal generation circuit using the switching pulse.