CCD Comb filter employing floating gate subtractor techniques

Details CCD Comb filter employing floating gate subtractor techniques CCD Comb filter employing floating gate subtractor techniques

1982-05-28

1985-04-09

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 37, 358 23, 333165, H04N 9535

Patent

active

045105227

ABSTRACT:
A charge transfer device (CTD) delay line comb filter for separating the frequency interleaved luminance and chrominance 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 causes imperfect separation due to having a non-zero time delay and not having exactly unity gain.

REFERENCES:
patent: 4096516 (1978-06-01), Pritchard
patent: 4104543 (1978-08-01), Maeding
patent: 4158209 (1979-06-01), Levine
patent: 4195273 (1980-03-01), Prince
patent: 4205335 (1980-05-01), Nakagawa
patent: 4217605 (1980-08-01), Carnes
patent: 4353093 (1982-10-01), Durbin, Jr.
patent: 4377794 (1983-03-01), Sakaue
Design and Performance of a CCD Comb Filter IC, by D. J. Sauer, RCA Review, vol. 41, No. 1, Mar. 1980, pp. 29-56.

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