JPS6221394A - Video signal processor - Google Patents

Abstract

PURPOSE:To obtain a video signal processor for adding a special video effect and outputting the video signal by converting an inputted composite video signal into three primary color analog RGB signals and slicing these analog RGB signals by a preset slice level. CONSTITUTION:An inputted composite video signal is separated into a chroma signal and a luminance signal by a Y/C separating circuit 1, and the separated chroma signal is converted into analog RGB signals consisting of three primary colors by a decoder circuit 2. The separated luminance signal Y is inputted to a synchronizing separation circuit 3, herein, a burst flag gate pulse required for the decoder circuit 2 is outputted and the gate pulse is outputted to an equilibrium modulating circuit 4 disposed at a final end side of a color collector. The analog RGB signals outputted from the decoder circuit 2 are inputted to a slice circuit 5, herein the respective signals are sliced at predetermined slice levels and inputted to the equilibrium modulator circuit 4.

Description

Detailed Description of the Invention 2. Scope of Claims (Field of Industrial Application) The present invention relates to a video signal processing device that adds special video effects to an input composite video signal and outputs the resultant signal.

(Prior art) - When dubbing is repeated using a video cassette recorder, etc., the image quality deteriorates, and at the same time the color burst and color subcarrier level in the composite video signal decreases, resulting in poor color reproducibility and, in extreme cases, The color synchronization will also become unstable. For this reason, a color corrector device is provided which demodulates a composite video signal, separates it into three primary colors, and outputs the composite video signal as a new composite video signal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video signal processing device that outputs a color corrector device with a special video effect added thereto.

(Means for Solving the Problems) The present invention converts an input composite video signal into analog RGB signals of three primary colors, slices these analog RGB signals at a preset slice level, and converts the input composite video signal into three primary color analog RGB signals. The RGB signals are balanced-modulated and output.

(effect) When converted into three primary color analog RG/B signals.

This analog RGB signal is sliced at a preset slice level and input to a balanced modulation circuit, where it is output as a new composite video signal.

By arbitrarily setting such a slice level, a signal with a kind of special video effect can be obtained, and a new screen can be enjoyed.

This slice level is 1, for example, R signal, B signal.

It is arbitrarily set for each G signal.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a video signal processing device according to the present invention, and the area surrounded by a dashed line shows a conventionally used color corrector device.

The color corrector device converts the input composite video signal into Y/
A C separation circuit 1 separates the signal into a chroma signal and a luminance signal, and the separated chroma signal is converted into an analog RGB signal consisting of three primary colors by a decoder circuit 2. On the other hand, the nine-separated luminance signal (Y) is input to a synchronization separation circuit 3 (including a gate generation circuit), which outputs a burst flag gate pulse necessary for the decoder circuit 2, and also outputs a burst flag gate pulse necessary for the decoder circuit 2. A gate pulse is output to the balanced modulation circuit 4 provided on the terminal side. The analog RGB signal output from the decoder circuit 2 is sent to the slice circuit 5.
where each is sliced at a predetermined slicing level.

The signal is input to the balanced modulation circuit 4. This slice circuit 5
consists of a circuit that slices each of the R signal, G signal, and B signal at a set slice level, and an example of this circuit is shown in FIG. FIG. 2 illustrates the slice circuit 5 provided for the R signal.

In FIG. 2, the input R signal is biased by the resistor R1+R2 and output from the resistor R1 via the emitter follower by the transistor Q1 (signal S,),)
It is input to one input side transistor Q2 of a differential amplifier consisting of transistors Qz and Q3. The other transistor Q is provided with a variable resistor V R+ that sets the slice level. The emitter sides of these differential amplifiers are made into a common emitter by a resistor R6, and the collector sides are connected to resistors R, , R5, respectively. A resistor R4 connected to the collector side of this transistor qz is connected to a transistor Q4 forming an inverting amplifier using the resistor R4 as an output resistor. This transistor Q4 is biased by resistors R8 and R9, and a peaking capacitor C3 is connected to the emitter side. An emitter follower consisting of a transistor Q is connected to the output resistor R3 of this transistor Q4, and a signal S2 is output from the emitter of the transistor Q constituting this emitter follower via an output resistor R1° and a coupling capacitor C2.
The signal is input to the balanced modulation circuit 4. In this way, the RGB signal converted into a pulse signal is balanced-modulated and converted again into a composite video signal.

When displayed on a monitor television (not shown), depending on the setting of the slice level setting volume VR, for example, the boundaries between bright and dark areas may be clear compared to, for example, a human input signal.
You can also create an effect that looks like the entire image is being sprayed. of course.

Such signals can also be recorded on a bidet, and by changing the slice level settings, the input composite video signal can be converted from the same state as the input composite video signal to a composite video signal with a very special format and output. It is also possible.

(Effects of the Invention) As described above, according to the present invention, it is possible to output a composite video signal with a kind of special effect by setting the slice level, and it is possible to enjoy new video effects that have not existed before. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a video signal processing device according to the present invention, FIG. 2 is a circuit diagram showing an embodiment of a slice circuit, and FIG. 3 is a waveform diagram illustrating signal waveforms in the slice circuit. be. 2... Decoder circuit 4... Balanced modulation circuit 5...
slice circuit

Claims (1)

[Claims] 1) The input composite video signal is an analog RGB of three primary colors.
A video signal processing device characterized in that the analog RGB signals are converted into signals, these analog RGB signals are sliced at a preset slice level, and the RGB signals after slicing are balanced modulated and output.