Automatic telephone answering system using a single single-tone

Details Automatic telephone answering system using a single single-tone Automatic telephone answering system using a single single-tone

1986-08-27

1989-07-25

Faber, Alan

Telephonic communications

Audio message storage, retrieval, or synthesis

Dynamic audio signal recording or reproduction

379 70, H04M 165

Patent

active

048521507

ABSTRACT:
In an automatic telephone answering system which records and reproduces an outgoing message to be sent to a calling party and an incoming message from the calling party on a recording medium, such as magnetic tape, a single-tone test signal from a touch tone signal generator is recorded on the tape as a cue signal to indicate a position of one of the incoming and outgoing messages. The single-tone signal is also used for a variety of signals in the operation of the automatic telephone answering system, such as a beep tone, an instruction signal and an alarm signal. The reproduced cue signal which is within an audio band is discriminated from an audio signal representing the outgoing or incoming message by a phase-locked loop having a narrow capture range and a loop filter with a prolonged time constant.

REFERENCES:
patent: 3381276 (1968-04-01), James
patent: 3730997 (1973-05-01), Konno
patent: 3943292 (1976-03-01), Takazawa
patent: 4500753 (1985-02-01), Plunkett, Jr.
Star Telephone Answering and Recording Set, by Edward A. Marheine GTE Technical Journal, vol. 13, No. 3 Jul. 1972 pp. 106-109.
Solid State Radio Engineering, Krauss and Bostian, p. 179 .COPYRGT. 1980.

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