Image processing apparatus

Details Image processing apparatus Image processing apparatus

1988-08-24

1989-09-26

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 358456, H04N 100

Patent

active

048704997

ABSTRACT:
In an image processing apparatus, an image signal generator includes a ROM and a D/A converter. The ROM consists of gain conversion tables. A PWM signal generator includes a frequency divider, a flip-flop, an integrator, a voltage divider, and a comparator. The frequency divider is synchronized with the ROM in response to a sync selection signal. An output from the frequency divider is further frequency-divided by the flip-flop and then converted into a triangular wave signal by the integrator. The bias component of the triangular wave signal is adjusted by the voltage divider. The resultant signal supplied to one input terminal of the comparator is compared thereby with an output from the D/A converter, thereby obtaining a PWM signal. The peak and bottom values of the triangular wave signal are always matched with the maximum and minimum values of the output from the D/A converter.

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