JPS62296693A - Video signal processor - Google Patents

Abstract

PURPOSE:To process the playback signal and input video signal of a low frequency conversion type VTR together with extremely simple constitution by obtaining a continuous chrominance subcarrier from the color burst of the input video signal and using it as a reference signal. CONSTITUTION:The input video signal is made into the continuous chrominance subcarrier from the color burst by a color synchronizing part 1 to become the reference signal of the color signal processing circuit 27 of the VTR 2, whose playback color burst is the same as that of the input signal. The low frequency converted color signal is frequency-converted by an APC loop in a processing circuit 27 and the color burst is so controlled as to become in phase with the input reference signal. The output and input video signal of the VTR 2 are inputted to a signal processing part 3, the output of the VTR 2 is reduced on a screen and put in the video signal, and the output appears at a terminal 5.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention Industrial Application Field The present invention reproduces a video signal recorded by a low frequency conversion method such as a video tape recorder (/VTR), and converts it into another video signal. The present invention relates to a video signal processing device that also performs signal processing.

2. Description of the Related Art A conventional general signal processing device has a configuration as shown in FIG. The video signal input from the input terminal 10 is sent to the demodulator 6
1, and a luminance signal Yl, a color difference signal 11. Let each signal be Ql. Further, the output of the VRT9 is also demodulated by the demodulator 62, and the luminance signal Y21 color difference signal 12. Each signal of Q2 is inputted to the signal processing unit 7, and after performing processing such as, for example, shortening the time axis of one signal, reducing it when viewed on the screen, and fitting it into the other signal, the output Y3 ．． +3. Q3
is modulated by a modulator 8 to become a composite color video signal.

Problems to be Solved by the Invention In such conventional devices, a demodulator and a modulator are required, and signal deterioration associated with the demodulators and modulators is unavoidable.

The present invention has been made in view of this point, and an object of the present invention is to provide a video signal processing device that performs signal processing with a simple configuration that does not require a demodulator or a modulator.

Means for Solving the Problem In order to solve the two-legged problem, the present invention obtains a continuous color subcarrier from a color burst of an input video signal and converts it into a V
By shifting from the standard foreclosure of the signal processing circuit of the TR, V
By matching the phases of the color bursts of the output of the TR and the input video signal, the signal processing itself is facilitated.

According to the present invention, with the above-described configuration, the phase of the color subcarrier of the VTR reproduction signal and the input video signal match, so that signal processing can be easily performed.

Embodiment An embodiment of the video signal processing device of the present invention will be described below.
This will be explained using drawings.

FIG. 1 is a block diagram showing an embodiment of the video signal processing device of the present invention.

First, the inside of the VTR 2 will be briefly explained. The signal recorded on the tape is reproduced by a reproducing device 1"2I and amplified by a preamplifier 22. Its output is passed through a low pass filter (LPF) 26 and a high pass filter (HPF) 2.
3, each is divided into a low frequency converted color signal and a frequency modulated luminance signal, the low frequency converted color signal is returned to the original color signal of the color subcarrier in the color signal processing circuit 27, and the frequency modulated luminance signal is , FM demodulated by the luminance signal processing circuit 24,
The adder 25 adds the color signal to the original video signal.

The video signal inputted from the input terminal 4 receives continuous color subcarriers from the color berth I by the color synchronization section 1. Since this color subcarrier becomes a reference signal for the color signal processing circuit 27 of the VTR 2, the output of the VTR 2, that is, the color burst of the reproduced video signal is the same as that of the human video signal.

The color signal processing circuit generally consists of a feedback loop called APC, and the low frequency converted color signal is frequency converted by the APC, and at this time, the color burst is converted to the input reference signal (
Generally, it is controlled to match the phase of a fixed oscillator). Therefore, even if a color signal is accompanied by a jitter component, such as in a VTR, the phase of the color burst is stabilized by APC, and correct colors are reproduced. This is explained in detail in Japanese Patent Publication No. 50-14852.

The output of the VTR 2 and the input video signal are input to the signal processing section 3, and the output of the VTR 2 is reduced on the screen as shown in FIG. 2(B), and the input video signal shown in FIG. The output terminal 5 receives an output from the output terminal 5.

One scanning line indicated by (L) in the figure is shown in FIG. If the phase of the color subcarrier of B) is different from that of the input video signal (A), the output (B) part of the VTR2 will not have the correct color. Since the phase of the input video signal (A) and the color burst of the output (B) of the VTR 2 are matched by the color signal processing circuit 27, the correct color is also applied to the output (B) of the VTR 2.

Effects of the Invention As described above, according to the present invention, it is possible to perform signal processing by combining the playback signal of a low-frequency conversion VTR and the input video signal with an extremely simple configuration. Extremely useful.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing a video signal processing device in an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the screen configuration of video signals, and FIG. 3 is a signal for one 2M scanning line. FIG. 4 is a block diagram showing a conventional video signal processing device. 1...Color synchronization section, 2...VTR, 27
...VTR color signal processing circuit, 3...
Signal processing section.

Claims (1)

[Claims] a color synchronization unit that obtains continuous color subcarriers from a color burst of a composite color video signal; and a video signal regeneration circuit that uses the color subcarriers as a reference signal for a color signal processing circuit of a low-pass conversion type video signal regeneration circuit; A video signal processing device that performs signal processing on the output of the input composite color video signal and the input composite color video signal.