Combined answer-phone and facsimile machine for telephone line - has logic circuit recording message when ringing tones first occur, and switching to facsimile if tones occur later

摘要

The logic circuit inputs the ringing tone. The input telephone line is connected in parallel to a facsimile machine and an answering machine. If a facsimile tone is input to the logic, and if the timer measures a time interval of smaller than 10 seconds, there is considered to be no speech message from the caller, and the recorded message is erased. If the time interval is greater than 10 seconds, then the speech message is recorded and a signal commands the end of recording. Following either event, the relay switch is switched from the recorder to the facsimile machine. ADVANTAGE - Stores recorded information on answer-phone if facsimile machine is switched on after speech message has been recorded.