Electronic signal processing apparatus

Details Electronic signal processing apparatus Electronic signal processing apparatus

H - Electricity

04

N

350/72

H04N 9/78 (2006.01)

Patent

CA 1106057

Abstract of the Invention A charge coupled device (CCD) comb filter arrange- ment is provided which is particularly suited for separating luminance and chrominance signal components in a color television signal. Parallel paths of long and short CCD delay lines using a common clock drive are provided in which the difference in delay between the long and short lines determines the frequency intervals between the teeth of the comb substantially independently of factors other than the clock frequency and the number of delay stages. In an embodiment suitable for processing standard NTSC broadcast signals, a clock frequency of three times the color sub- carrier frequency is employed in combination with a long, two phase delay line of 683 1/2 stages and two short delay lines of one stage each to provide the desired 1-H combs for luminance and chrominance. Vertical detail information is recovered from the chrominance comb and is re-inserted as desired into the luminance signal.

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