Control circuitry for a tape cassette telephone answering device

Details Control circuitry for a tape cassette telephone answering device Control circuitry for a tape cassette telephone answering device

1982-09-13

1984-09-18

Faber, Alan

H04M 164

Patent

active

044725990

ABSTRACT:
Control circuitry for a telephone answering device is disclosed. This includes a tone burst oscillator the output of which is used both to provide audio signals to the caller and to control device operation. At the end of announcement transmission, the oscillator output is used to condition the mid-cycle shift. At the end of message recording, the output is used to return the answering device to the standby condition. A steering circuit connected to the oscillator output insures that each tone burst output provides the correct function control. Modified function control also is provided when an "announce only" mode is selected or when a new announcement is recorded.

REFERENCES:
patent: 3751042 (1973-08-01), Platt
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patent: 3904826 (1975-09-01), Murata
patent: 4104487 (1978-08-01), Jacobson
patent: 4126763 (1978-11-01), Jacobson
patent: 4149202 (1979-04-01), Terada
patent: 4197426 (1980-04-01), Jacobson
patent: 4201888 (1980-05-01), Jacobson
patent: 4213010 (1980-07-01), Jacobson
patent: 4236044 (1980-11-01), Jacobson

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