Signal translating apparatus for composite signal subject to jitter

In a color image signal translating system comprising a source of an input composite signal including a luminance signal occupying a wide band of frequencies, and a chrominance signal occupying only an intermediate portion of said wide band, the combination comprising:

• a voltage controlled oscillator having an output of a frequency determined by a control voltage input;
• means for modulating the output of said oscillator with said input composite signal to develop a modulated carrier output having a sideband in which said chrominance signal occupies an intermediate portion;
• a comb filter having a single 1H delay line, and means for subtractively combining the input and output of said delay line, the passband of said delay line encompassing only a portion of said sideband inclusive of said intermediate portion;
• means for applying said modulated carrier output to the input of said comb filter, said applying means having a passband encompassing said intermediate portion of said sideband to the exclusion of the remainder of said sideband;
• chrominance signal utilization means responsive to the output of said comb filter;
• and
• means for rendering the control voltage input to said oscillator responsive to spurious variations of input composite signal frequencies.

In combination with playback apparatus for deriving from a video disc record a composite video signal including a luminance signal occupying a wide band of frequencies, and a chrominance signal occupying only an intermediate portion of side wide band, a signal translating system comprising:

• a voltage controlled oscillator having an output of a frequency determined by a control voltage input;
• means for rendering the control voltage input to said oscillator responsive to spurious frequency variations of said chrominance signal;
• means for modulating the output of said oscillator with said composite signal to develop a modulated carrier output having a sideband in which a frequency shifted version of said chrominance signal, substantially free of said spurious frequency variations, occupies an intermediate portion;
• said intermediate portion of said sideband lying above said wideband;
• a 1H delay line responsive to the output of said modulating means, the passband of said delay line encompassing only a portion of said sideband inclusive of said intermediate portion;
• first comb filter means, including a signal combiner responsive to the input and the output of said delay line, for passing said frequency shifted version of said chrominance signal to the substantial exclusion of luminance signal components;
• means for developing from said composite signal a wideband output signal occupying said wide band of frequencies, and comprising luminance signal components to the substantial exclusion of chrominance signal components;
• and
• means for combining the wideband output signal of said developing means with the frequency shifted version of said chrominance signal passed by said first comb filter means to form an output composite signal having luminance and chrominance signals in respective non-overlapping frequency bands.

A video processing system comprising:

• a. a source of a color television signal of the form obtained by colorplexing a frequency shifted chrominance signal shifted to a lower frequency band with a luminance signal by using frequency interlacement;
• b. an extracting means for extracting a signal in the lower frequency shifted chrominance signal band from said color television signal and providing the extracted signal at its output;
• c. a first frequency conversion means having an output terminal for frequency converting the extracted signal in the lower frequency shifted chrominance signal band into a first signal in the chrominance signal band of a standard color television signal;
• d. a first separating means connected to the output terminal of said first frequency conversion means for separating the chrominance signal from said first signal, said first separating means including a first comb filter including a oneline delay element and providing the separated chrominance signal at its output;
• e. a second frequency conversion means for frequency converting the chrominance signal separated by said first separating means to the frequency band of said lower frequency shifted chrominance signal band;
• f. an adding means for adding the output of said second frequency conversion means to said color television signal in opposite phase to each other so that only the lower frequency shifted chrominance signal in said color television signal is cancelled;
• and
• g. means for mixing the output of said first separating means with the output of said adding means wherein a standard color television signal is obtained as the output of said mixing means.