Apparatus for limiting the output signal frequency band of an op

Details Apparatus for limiting the output signal frequency band of an op Apparatus for limiting the output signal frequency band of an op

1988-10-12

1990-07-24

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 50, 358 38, H04N 9097

Patent

active

049438506

ABSTRACT:
A digital video color camera having three solid-state image sensing devices and an analog-to-digital converter that converts the signal from the image sensing devices to a digital signal and a digital signal processing circuit that processes the output of the analog-to-digital converter further includes a clock generator that generates a first sampling clock signal used to drive the solid-state image sensing devices and a second clock signal having a frequency (f2) that is higher than the first frequency (f1) used to drive the digital signal processing circuit. An optical low-pass filter and an electrical low-pass filter are provided between the image sensing devices and the analog-to-digital converter in one embodiment, and in another embodiment the electrical low-pass filter is after the analog-to-digital converter. The optical low-pass filter has a frequency characteristic chosen to depress the frequency band component between the frequencies f1-1/2f2 and f1. The electrical low-pass filter, on the other hand, is chosen to have a frequency characteristic to depress a frequency band component higher than the frequency 1/2f2.

REFERENCES:
patent: 4599640 (1986-07-01), Dischert
patent: 4663661 (1987-05-01), Weldy et al.

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