Image signal processor with noise elimination circuit

Details Image signal processor with noise elimination circuit Image signal processor with noise elimination circuit

1989-02-15

1990-07-10

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358167, H04N 314, H04N 514

Patent

active

049410520

ABSTRACT:
For improvement in high frequency response characteristics, a noise eliminating circuit incorporated in an image signal processor has a delay line coupled between an output node of a charge coupled device and a ground node, and an emitter follower circuit coupled at the base node thereof to the output node the the charge coupled device, and each electric image signal supplied from the charge coupled device is reflected from the ground node to introduce a delay therein and merged into the subsequent electric image signal to produce a noise eliminated electric image signal which is supplied to the emitter follower circuit, so that the noise eliminated electric image signal is amplified by the emitter follower circuit with a constant gain, because of a small time constant coupled to the base node of the emitter follower circuit.

REFERENCES:
patent: 4065788 (1977-12-01), Meier et al.
patent: 4413284 (1983-11-01), Izumita et al.
patent: 4473845 (1984-09-01), Davy

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