CCD comb filters

Details CCD comb filters CCD comb filters

1978-06-29

1979-06-12

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

357 24, H04N 9535, H01L 2978

Patent

active

041582098

ABSTRACT:
Comb filter which includes a first CCD delay line for imparting a delay equal to one horizontal line time plus the delay inserted by N additional stages and second and third CCD delay lines, each having N stages. Video signal is applied to the first and second delay lines and its complement to the third delay line. The gains of the second and third CCD delay lines are controlled to make them equal to that of the first CCD delay line to control the depth of the rejection notches of the filter to desired levels. In one embodiment, feedback from the output of the first and second lines is employed to control the gain of the second line and feedback from the output of the first and third lines is employed to control the gain of the third line. In another embodiment, the respective gains are controlled in open loop fashion by controlling the residual charge in the input storage well of CCD's operated in the skimming mode.

REFERENCES:
patent: 3660697 (1972-05-01), Berglund et al.
patent: 3858232 (1974-12-01), Boyle et al.
patent: 4041298 (1977-08-01), Lampe et al.
patent: 4096516 (1978-06-01), Pritchard
Kosonockey et al., "Basic Concepts of Charge-Coupled Devices," RCA Review, vol. 36, Sep. 1975, pp. 566-593.
Sequin et al., "Linearity of Electrical Charge Injection Into Charge-Coupled Devices," IEEE Journal of Solid-State Circuits, vol. SC-10, No. 2, Apr. 1975, pp. 81-92.

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