Telephone answering device having balanced input

Details Telephone answering device having balanced input Telephone answering device having balanced input

1979-02-21

1980-10-07

Konick, Bernard

179 84R, 179 1C, 179 2C, H04M 164

Patent

active

042270537

ABSTRACT:
In this telephone answering device, the outgoing and incoming audio amplifiers are interconnected to function as a mode switching flip-flop. Remote playout is enabled upon detection of a first beep tone. This sets a control flip-flop which consists of a single operational amplifier interconnected with a steering capacitor to function as a toggleable bistable circuit. A cylindrical cam mechanism and associated control circuit are actuated by setting of the remote playout control flip-flop. These cooperate with a reel drive motor first to rewind the message tape and then to drive it forward as the recorded messages are played out via the telephone line to the user. Detection of a second beep tone resets the control flip-flop, terminating remote playout. The device employs a single sided solid state ring detector having a transformer input circuit that presents a balanced load to the telephone line, thereby permitting ac powered operation of the device.

REFERENCES:
patent: 3226478 (1968-12-01), Martin
patent: 3436483 (1969-04-01), Blane
patent: 3614324 (1971-10-01), Buzzard
patent: 3909537 (1975-09-01), Jacobson
patent: 3909538 (1975-09-01), Jacobson
patent: 4025727 (1977-05-01), Verbaas

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