Digital/analog converter and image processing apparatus using th

Details Digital/analog converter and image processing apparatus using th Digital/analog converter and image processing apparatus using th

1991-05-23

1993-12-21

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 341144, H04N 140

Patent

active

052725448

ABSTRACT:
An image processing apparatus having: an unit for receiving a digital multi-value pixel data; a D/A converter for converting the inputted multi-value pixel data into an analog signal; a generator for generating an analog pattern signal synchronously with an input of the digital multi-value pixel data; a sample/hold circuit for sampling and holding the analog signal converted by the D/A converter, synchronously with an input of the digital multi-value pixel data; and a binarizing circuit for generating a binarized pulse signal having a width corresponding to the value of the digital multi-value pixel data by comparing the analog signal held the said sample/hold circuit with the pattern signal generated by the pattern signal generator. A D/A converter having: a digital/analog conversion unit for converting a digital signal into an analog signal at the same speed as the period of generating the digital signal; and a sample/hold circuit for holding and outputting the analog signal converted by the digital/analog conversion unit, synchronously with the period of generating the digital signal.

REFERENCES:
patent: 4800442 (1989-01-01), Riseman et al.
patent: 4811037 (1989-03-01), Arai
patent: 4819066 (1989-04-01), Miyagi
patent: 4864305 (1989-09-01), Toyama
patent: 4868684 (1989-09-01), Suzuki
patent: 4926248 (1990-05-01), Kobayashi et al.
patent: 4926268 (1990-05-01), Kawamura et al.
patent: 5029227 (1991-07-01), Kawamura

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