US 5,351,089 A · Video signal processing device and method

Abstract

A video signal processing device comprises: a unit for extracting a first color burst signal from a first video signal; a unit for generating a first subcarrier in synchronism with the first color burst signal extracted from the first video signal; a unit for extracting a second chrominance signal and a second color burst signal from a second video signal; a unit for demodulating the second chrominance signal and the second color burst signal on the basis of the first subcarrier to obtain a demodulated second color signal and a demodulated second color burst signal; and an operating unit for performing operation process of the demodulated second color signal on the basis of the demodulated second color burst signal in a manner such that the demodulated second color signal is converted into a corrected color signal which is substantially the same as an imaginal second color signal which is obtained on the assumption that the second chrominance signal is demodulated on the basis of a second subcarrier synchronized with the second color burst signal extracted from the second video signal.

Claims52

Dependent claims

A video signal processing device comprising:

means for extracting a first color burst signal from a first video signal;
means for generating a first subcarrier in synchronism with said first color burst signal extracted from said first video signal;
means for extracting a second chrominance signal and a second color burst signal from a second video signal;
means for demodulating said second chrominance signal and said second color burst signal on the basis of said first subcarrier to obtain a demodulated second color signal and a demodulated second color burst signal;
and
operating means for performing operation process of said demodulated second color signal on the basis of the demodulated second color burst signal in a manner such that the demodulated second color signal is converted into a corrected color signal which is substantially the same as an imaginal second color signal which is obtained on the assumption that the second chrominance signal is demodulated on the basis of a second subcarrier synchronized with the second color burst signal extracted from the second video signal.

3 more elements

A video signal processing device comprising:

an A/D converter for converting an inputted video signal into a digital video signal;
means for generating a clock synchronized with a horizontal synchronizing signal included in said inputted video signal;
means for extracting a chrominance signal and a color burst signal from said digital video signal;
means for demodulating said chrominance signal and said color burst signal on the basis of the clock to obtain a demodulated color signal and a demodulated color burst signal;
and
operating means for performing operation process of said demodulated color signal on the basis of said demodulated color burst signal in a manner such that said demodulated color signal is converted into a corrected color signal which is substantially the same as a second color signal which is obtained in the case where said chrominance signal is demodulated on the basis of a clock synchronized with a color burst signal included in said inputted video signal.

3 more elements

A video signal processing method comprising:

a step of converting an inputted video signal into a digital video signal;
a step of generating a clock synchronized with a horizontal synchronizing signal included in said inputted video signal;
a step of extracting a chrominance signal and a color burst signal from said digital video signal;
a step of demodulating said chrominance signal and said color burst signal on the basis of said clock to obtain a demodulated color signal and a demodulated color burst signal;
and
an operating step of performing operation process of said demodulated color signal on the basis of said demodulated color burst signal in a manner such that said demodulated color signal is converted into a corrected color signal which is substantially the same as a second color signal which is obtained in the case where said chrominance signal is demodulated on the basis of a clock synchronized with a color burst signal included in said inputted video signal.

3 more elements

A video signal processing device comprising:

a circuit for extracting a first color burst signal from a main video signal corresponding to a main picture;
a circuit for generating a first subcarrier in synchronism with the first color burst signal extracted from the main video signal, the circuit for generating a first subcarrier including a single quartz-crystal oscillator;
a circuit for extracting a second chrominance signal and a second color burst signal from a sub video signal corresponding to a sub picture to be superimposed onto the main picture;
a circuit for demodulating the second chrominance signal and the second color burst signal on the basis of the first subcarrier to obtain a demodulated second color signal and a demodulated second color burst signal;
and
an operating circuit for performing an operation on the demodulated second color signal on the basis of the demodulated second color burst signal such that the demodulated second color signal is converted into a corrected color signal which is substantially the same as an imaginal second color signal obtained on the assumption that the second chrominance signal is demodulated on the basis of a second subcarrier synchronized with the second color burst signal extracted from the sub video signal.

3 more elements

A video signal processing device comprising:

a first receiving circuit for receiving a first broadcast signal;
a first demodulator for demodulating an output of the first receiving circuit to output a first video signal;
a second receiving circuit for receiving a second broadcast signal;
a second demodulator for demodulating an output of the second receiving circuit to output a first video signal;
a switching circuit for switching between a first state in which the first video signal is outputted as a main video signal from the switching circuit and the second video signal is outputted as a sub video signal from the switching circuit and a second state in which the first video signal is outputted as the sub video signal from the switching circuit. and the second video signal is outputted as the main video signal from the switching circuit;
a circuit for extracting a first luminance signal, a first chrominance signal, and a first color burst signal from the main video signal;
a circuit for generating a first subcarrier in synchronism with the first color burst signal extracted from the main video signal;
a circuit for extracting a second luminance signal, a second chrominance signal, and a second color burst signal from the sub video signal;
a circuit for demodulating the second chrominance signal and the second color burst signal on the basis of the first subcarrier to obtain a demodulated second color signal and a demodulated second color burst signal;
an operating circuit for performing an operation on the demodulated second color signal on the basis of the demodulated second color burst signal such that the demodulated second color signal is converted into a corrected color signal which is substantially the same as an imaginal second color signal obtained on the assumption that the second chrominance signal is demodulated on the basis of a second subcarrier synchronized with the second color burst signal extracted from the sub video signal;
a circuit for outputting a third video signal based on the first luminance signal, the first chrominance signal, the second chrominance signal, and the corrected color signal, wherein the third video signal corresponds to a picture to be obtained by superimposing a subpicture corresponding to the sub video signal into a main picture corresponding to the main video signal;
and
a CRT for displaying an image corresponding to the third video signal.

10 more elements

Dependencies are inferred from the claim text.

Video signal processing device and method

Life of this patent

Video signal processing device and method

Life of this patent

Abstract

Claims52