Method and apparatus for interrupting a facsimile transmission

Details Method and apparatus for interrupting a facsimile transmission Method and apparatus for interrupting a facsimile transmission

1980-02-11

1986-05-13

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358256, H04N 132

Patent

active

045890331

ABSTRACT:
Disclosed herein is a facsimile transmitting apparatus including a sensor for detecting the dark/light variations in a document and a transmitter for generating and transmitting transmission signals including signals representing those dark/light variations. The transmitting apparatus further includes a receiver for detecting received signals including an interrupt signal of predetermined frequency. Control means are coupled to the transmitter and to the transceiver for interrupting transmission upon detection of the interrupt signal. The receiver includes a means for subtracting the transmitted signal from the received signal so as to generate a difference signal. Transmission is interrupted if the difference signal comprises the predetermined frequency.

REFERENCES:
patent: 3914538 (1975-10-01), Perreault

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