Importance

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Abstract

An automatic telephone answering system including a recorder having an input and an output connected to a telephone line for the recording and playing of messages and which is remotely controllable through the use of a dual-tone signal. A recorder control apparatus controls the recorder and is connected to receive input signals sent over the telephone line to the recorder and output signals sent from the recorder. The recorder control apparatus generates an inhibit signal to the recorder when the recorder control apparatus detects the fact that at the input or output a signal having dual-tone frequencies continues for a predetermined maximum allowable time which is shorter than the minimum time for dual-tone signal detection, thereby preventing said signal having the dual-tone frequencies from being input to or output from the recorder over a time period longer than said minimum time for dual-tone signal detection.

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First Claim