Method of encoding color television signal and a circuit therefor

A circuit for encoding a composite image signal in a color television having gamma correction matrix means, first and second low pass filters, quadrature phase modulator means and mixer means, comprising:

• a luminance signal from said gamma correction matrix means is coupled to an input terminal of first filter means, and color-difference signals from said gamma correction matrix means are coupled to input terminals of said first and second low pass filters;
• outputs from said first and second low pass filters are coupled to input terminals of second and third filter means;
• a pattern value and a motion value are detected from said luminance signal by pattern and motion detecting means;
• the output from said pattern and motion detecting means is applied to said first, second and third filter means;
• the output from said first filter means is coupled to said mixer means;
• and
• the outputs from said second and third filter means are coupled to said quadrature phase modulator means, and the output of said quadrature phase modulator means is coupled to said mixer means to provide an encoded video signal.

A circuit for encoding a composite image signal in a color television having gamma correction matrix means coupled to receive a plurality of color signals, first and second low pass filters, quadrature phase modulator means and mixer means, comprising:

• a luminance signal from said gamma correction matrix means is applied to first filter means, and color-difference signals from said gamma correction matrix means are applied to said quadrature phase modulator means via said first and second low pass filters;
• the output of said quadrature phase modulator means is coupled to an input terminal of second filter means;
• the luminance signal is applied to pattern and motion detecting means;
• and
• the output from said pattern and motion detecting means is applied to said first and second filters means, and the outputs from said first and second filters means are input to said mixer means to provide an encoded video signal.

A circuit for encoding a video signal in a color television having a gamma correction matrix for separating color signals into a luminance signal and color difference signals, a plurality of low-pass filters for providing filtered color difference signals, comprising:

• detector means for detecting said luminance signal to provide detected pattern and motion value signals;
• first filter means for filtering said luminance signal according to said detected pattern and motion value signals to provide a first intermediate signal;
• second plural filter means for filtering the filtered color difference signals according to said detected pattern and motion value signals to provide a plurality of second intermediate signals;
• quadrature phase modulator means for modulating said plurality of second intermediate signals according to a chrominance sub-carrier signal and a burst flag signal to provide a third intermediate signal;
• and
• mixer means for mixing said first intermediate signal and said third intermediate signal according to a control signal to produce an encoded video signal.

A circuit for encoding a video signal in a color television having a gamma correction matrix for separating color signals into a luminance signal and color difference signals, a plurality of low-pass filters for providing filtered color difference signal, comprising:

• detector means for detecting the luminance signal to provide detected pattern and motion value signals;
• first filter means for filtering said luminance signal according to said detected pattern and motion value signals to provide a first intermediate signal;
• quadrature phase modulator means for modulating the filtered color difference signals according to a chrominance sub-carrier signal and a burst flag signal to provide a second intermediate signal;
• second filter means for filtering said second intermediate signal according to said detected pattern and motion value signals to provide a third intermediate signal;
• and
• mixer means for mixing said first intermediate signal and said third intermediate signal according to a control signal to produce an encoded video signal.

A circuit for encoding a video signal, comprising:

• means for receiving a luminance signal and color difference signals;
• detecting means for detecting patterns of a frequency spectrum and motion pixels of said luminance signal to provide detected pattern and motion value signals;
• first filter means for filtering said luminance signal according to said detected pattern and motion value signals to provide a first intermediate signal;
• second plural filter means for filtering said color difference signals according to said detected pattern and motion value signals to provide a plurality of second intermediate signals;
• means for modulating said plurality of second intermediate signals according to first control signals to provide a third intermediate signal;
• and
• means for mixing said first intermediate signal and said third intermediate signal according to second control signals to produce an encoded video signal.

A circuit for encoding a video signal, comprising:

• means for receiving a luminance signal and color difference signals;
• detecting means for detecting the luminance signal to provide detected pattern and motion value signals;
• first filter means for filtering said luminance signal according to said detected pattern and motion value signals to provide a first intermediate signal;
• means for modulating the filtered color difference signals according to first control signals to provide a second intermediate signal;
• second filter means for filtering said second intermediate signal according to said detected pattern and motion value signals to provide a third intermediate signal;
• and
• means for mixing said first intermediate signal and said third intermediate signal according to second control signals to produce an encoded video signal.