Abstract: We describe an apparatus and method for decoding a SECAM chrominance signal. The apparatus may include a band-pass filter to separate the chrominance signal from the composite video baseband signal. A down-mixer down mixes the chrominance signal from a high to a low frequency band to generate two signals having a substantially 90° phase difference. A cloche filter filters the two signals. A differentiator differentiates the cloche filtered signals. A multiplier squares each differentiated signal. An adder sums the squared result while a square root takes the square root of the sum.

Abstract: Provided are an automatic signal gain control method and apparatus that adaptively controls signal gain according to sync tip depths in a video receiving system. The method includes: detecting a sync signal from a video signal; detecting a blank level and a sync tip level from a sync section of the sync signal; extracting a difference between the blank level and the sync tip level, as a sync tip depth; and controlling the gain of the video signal differently according to a variation of the sync tip depth.

Abstract: We describe an apparatus and method for decoding a SECAM chrominance signal. The apparatus may include a band-pass filter to separate the chrominance signal from the composite video baseband signal. A down-mixer down mixes the chrominance signal from a high to a low frequency band to generate two signals having a substantially 90° phase difference. A cloche filter filters the two signals. A differentiator differentiates the cloche filtered signals. A multiplier squares each differentiated signal. An adder sums the squared result while a square root takes the square root of the sum.