Ccd comb filter employing floating gate subtractor techniques

H - Electricity – 04 – N

Patent

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Details

CPC

350/72

IPC codes

H04N 9/12 (2006.01) H04N 9/78 (2006.01)

Type

Patent

Patent number

CA 1201800

Description

ABSTRACT A charge transfer device (CTD) delay line comb filter for separating the frequency interleaved luminance and chominance components of a composite video signal is provided wherein signal charges representative of the composite video signal within first and second delay lines are effectively subtracted one from the other by alternately passing them under a common, periodically clamped, normally floating sense electrode. This eliminates the need for a phase inverter which can cause imperfect separation due to having a non-zero time delay and not having exactly unity gain.

Application Number

427881

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