Facsimile apparatus having A/D converter shared with a plurality

Details Facsimile apparatus having A/D converter shared with a plurality Facsimile apparatus having A/D converter shared with a plurality

1994-06-17

1996-04-09

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358425, 341141, H04N 100, H03M 100

Patent

active

055067000

ABSTRACT:
A facsimile apparatus in which a single A/D converter used for analog image signals is shared efficiently with other analog sensors. The facsimile apparatus has an image scanner for outputting an analog image signal by scanning an original and at least one analog sensor for outputting an analog detection signal. A multiplexer is provided for selecting one of the analog signals including the analog image signal and the analog detection signal. An analog/digital converter converts the analog signal selected by the multiplexer into a digital signal. A primary scanning counter counts the number of pulses of a pixel clock signal indicating a reading timing of each pixel so as to output a count value, the count value being reset each time a line synchronization signal indicating a first position of each scanning line is supplied thereto. A decoder is provided for generating a selection signal in accordance with the count value supplied by the primary scanning counter, and supplies the selection signal to the multiplexer so that the multiplexer selects one of the analog signals corresponding to the selection signal.

REFERENCES:
patent: 4875099 (1989-10-01), Sakai et al.

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