Photosensitive self scan array with noise reduction

Details Photosensitive self scan array with noise reduction Photosensitive self scan array with noise reduction

1977-01-31

1979-03-20

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358167, 357 30, 328162, 328165, 307221D, 307311, 250578, H04N 314, H01L 2714, H03B 100

Patent

active

041457218

ABSTRACT:
A noise reduction scheme for a photosensitive self scan system includes an array of photosensitive elements producing video signals and first and second pluralities of switching elements, one element of each of the pluralities of switching elements being connected to one photosensitive element of the array. A first video line connects each element of the first plurality of switching elements to a first input terminal of a summing device such as a differential amplifier and a second video line connects each element of the second plurality of switching elements to a second input terminal of the differential amplifier. Shift register means operated by clock pulses is provided to control the operation of each of the elements of the first plurality of switching elements to sequentially couple the photosensitive elements to the first input terminal and to apply periodically only clock pulse noise signals through the gate drain capacitance of the second plurality of switching elements to the second input terminal of the differential amplifier, so as to produce at the output of the amplifier a video signal substantially free of noise signals created by the clock pulses.

REFERENCES:
patent: 3814846 (1974-06-01), Snow
patent: 3946151 (1976-03-01), Kamiyama et al.
patent: 4011402 (1977-03-01), Koike et al.
patent: 4045817 (1977-08-01), Nakatani et al.
patent: 4067046 (1978-01-01), Nakatani et al.

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