Auto focus frequency conversion filter for CCD imagers having di

Details Auto focus frequency conversion filter for CCD imagers having di Auto focus frequency conversion filter for CCD imagers having di

1991-02-25

1992-09-01

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 43, 328 15, H09N 5232

Patent

active

051444500

ABSTRACT:
A sampling frequency conversion filter circuit permits the same auto focus circuit to be used with CCD imagers having different numbers of pixels per line. The conversion filter converts a digital signal of a first sampling frequency into a second sampling frequency and for providing a digital signal of the first sampling frequency with a predetermined frequency characteristic includes a delay circuit for delaying an input digital signal of the first sampling frequency by a predetermined amount; a first flip-flop for taking in the input digital signal of the first sampling frequency in synchronism with a clock of the second sampling frequency; a second flip-flop for taking in the digital signal of the first sampling frequency delayed by the predetermined amount through the delay circuit with a clock of the second sampling frequency; an adder for adding outputs of the first and flip-flops; and control circuits for controlling inputs of the first and second flip-flops to obtain from the adder circuit an output equivalent to a result obtained by over-sampling the digital signal of the first sampling frequency at a frequency that is a common multiple of the first sampling frequency and the second sampling frequency, and then re-sampling it at the second sampling frequency via a filter having the predetermined frequency characteristic.

REFERENCES:
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patent: 4672456 (1987-06-01), Murai et al.
patent: 4740076 (1988-04-01), Ueda et al.
patent: 4845437 (1989-07-01), Mansur et al.
patent: 4943850 (1990-07-01), Asaida
patent: 4985777 (1991-01-01), Kawada

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