Interface circuit for utilizing a facsimile coupled to a PC as a

Details Interface circuit for utilizing a facsimile coupled to a PC as a Interface circuit for utilizing a facsimile coupled to a PC as a

1994-04-11

1996-06-25

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Facsimile system interface

358468, H04N 132

Patent

active

055305580

ABSTRACT:
Apparatus for interfacing a conventional facsimile machine with a PC enabling the use of the facsimile machine as a scanner or printer. A first switch assembly selectively couples the PC modem and facsimile machine either to independent telephone lines in a normal mode or to one another in a scan/print mode. A manually operated switch assembly is depressed for a brief interval sufficient to activate a ringing circuit which converts DC power from a small battery source to a 20 Hz sine wave of 90 volt amplitude and applies the sine wave signal to the PC to cause the PC or facsimile to enter into a scan or print mode, respectively. The manually operable switch is then released to apply a constant current to the facsimile machine to simulate an off-hook condition. A facsimile machine start button is then operated to start the facsimile machine which scans documents provided therein and transmits the scanned data in a conventional facsimile transmission format or activate the PC to transmit a fax in conventional facsimile transmission format to utilize the facsimile machine as a printer. The PC may be equipped with a suitable software program for converting non-graphic, i.e. such as word-type information into a binary format suitable for use in word processing applications and may store the data in a memory for subsequent use. An automatic circuit (25) may be provided to initiate a scanning or printing mode responsive to receipt of a unique number received from either the facsimile machine or the PC, thus eliminating the need for switches.

REFERENCES:
patent: 4652933 (1987-03-01), Koshiishi
patent: 4825465 (1989-04-01), Ryan
patent: 4924494 (1990-05-01), Shung
patent: 4964154 (1990-10-01), Shimotono
patent: 4991200 (1991-02-01), Lin
patent: 5157519 (1992-02-01), Jacobs

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