METHOD AND APPARATUS FOR INTERRUPTING A FACSIMILE TRANSMISSION

摘要

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.