Motion detector for chrominance signal in TV receiver

A motion detector for a chrominance signal for use with a TV receiver for detecting a motion of a chrominance signal contained in a video signal and generating a chrominance signal motion detection signal, comprising:

• a first input terminal adapted to be supplied with a digitalized video signal containing a luminance signal and a chrominance signal;
• a frame memory connected to said first input terminal and supplied with said digitalized video signal from said first input terminal, for delaying said video signal by one frame period and generating a delayed video signal;
• a first comb-type filter including a first 1 horizontal period delay element and a first adder, connected to said first input terminal, and supplied with said digitalized video signal from said first input terminal, for removing a luminance signal contained in said digitalized video signal and selecting a first chrominance signal;
• a second comb-type filter including a second 1 horizontal period delay element and a second adder, connected to said frame memory, and supplied with said delayed video signal from said frame memory, for removing a luminance signal contained in said delayed video signal therefrom and generating a second chrominance signal;
• a subtracter connected to said first comb-type filter and said second comb-type filter, supplied with said first chrominance signal from said first comb-type filter and said second chrominance signal from said second comb-type filter, for generating a difference signal between said first and second chrominance signals;
• a first absolute value conversion circuit connected to said subtracter and supplied with said difference signal from said subtracter, for generating an absolute value difference signal;
• and
• a smoother circuit connected to said first absolute value conversion circuit and supplied with said absolute value difference signal from said first absolute value conversion circuit, for smoothing a digital difference signal and generating said smoothed difference signal as a chrominance signal motion detection signal.