Video luminance chrominance separation

An apparatus, for use in a receiver configured to receive an electronic video signal, wherein the video signal includes a first component that is encoded with amplitude modulation and a second component that is encoded with frequency modulation on a carrier frequency, the apparatus comprising:

• a first filter device configured to receive the video signal and output a substantial portion of the first component as a received first component;
• a second filter device configured to receive the video signal and output a substantial portion of the second component as a received second component;
• a leakage detector device configured to receive the carrier frequency of the second component and output a leakage detection signal;
• and
• a variable signal adder configured to receive the leakage detection signal and to make a determination as to whether to add a portion of the received second component to the received first component.

An apparatus, for use in a receiver configured to receive an electronic video signal, wherein the video signal includes a first component that is encoded with amplitude modulation and a second component that is encoded with frequency modulation on a carrier frequency, the apparatus comprising:

• a first filter device configured to receive the video signal and output a substantial portion of the first component as a received first component;
• a second filter device configured to receive the video signal and output a substantial portion of the second component as a received second component;
• a leakage detector device configured to receive the carrier frequency of the second component and output a leakage detection signal;
• a demodulation device configured to demodulate the received second component and output a second component signal;
• and
• a variable signal reducer configured to receive the leakage detection signal and to make a determination as to whether to reduce a portion of the second component signal.

A method of decoding at least one of digital and analog composite SECAM video signals, wherein the composite SECAM video signal includes an amplitude modulated luminance signal, a frequency modulated chrominance signal, and a chrominance carrier signal, the method comprising:

• filtering the composite SECAM video signal into a received luminance signal and a received chrominance signal;
• monitoring the amplitude of the chrominance carrier signal;
• and
• adding a portion of the received chrominance signal into the received luminance signal if the amplitude of the chrominance carrier signal exceeds a first threshold.

An integrated circuit chip for use for decoding a composite SECAM video signal, wherein the composite SECAM video signal includes an amplitude modulated luminance signal, a frequency modulated chrominance signal, and a chrominance carrier signal, the chip comprising:

• a memory including stored instructions;
• and
• a processor coupled to the memory and configured to read the instructions from the memory to perform digital signal processing to decode the composite SECAM video signal;
• wherein, to decode the composite SECAM video signal the processor will:
• transform the composite SECAM video signal into a received luminance signal, a received chrominance signal, and a received chrominance carrier signal;
• monitor the amplitude of the received chrominance carrier signal;
• determine that the received chrominance signal includes a portion of the received luminance signal if the amplitude of the received chrominance carrier signal exceeds a first threshold value;
• and
• add a portion the received chrominance signal into the received luminance signal if the amplitude of the received chrominance carrier signal exceeds the first threshold value.