Image signal binary circuit with a variable-frequency clock sign

Details Image signal binary circuit with a variable-frequency clock sign Image signal binary circuit with a variable-frequency clock sign

1987-03-09

1989-06-13

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 29, 358 75, 358 80, 35821331, 358280, 358294, H04N 140, H04N 146, H04N 315, H04N 973

Patent

active

048397393

ABSTRACT:
A one-dimensional image sensor comprising a solid image pick-up element takes images in sequence, and generates an image signal. Clock pulses from a frequency variable type clock pulse generator having a frequency which varies in correspondence to a control signal are supplied to a one-dimensional image sensor, thereby image signals are outputted in sequence. The image signal is amplified by an amplifier and inputted to a comparator and compared with a reference signal. A frequency variable range of the frequency variable type clock pulse generator is set higher than the cut-off frequency of the amplifier, and the binary level output by the comparator is substantially the same as the image inputted to the one-dimensional image sensor and control is effected by the variable frequency of the clock pulses.

REFERENCES:
patent: 4159488 (1979-06-01), Tanaka et al.
patent: 4521804 (1985-06-01), Bendell
patent: 4598322 (1986-07-01), Atherton
patent: 4673972 (1987-06-01), Yukomizo

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