Speech networks for telephone sets

Details Speech networks for telephone sets Speech networks for telephone sets

1979-10-17

1981-08-04

Popek, Joseph A.

H04M 100

Patent

active

042824095

ABSTRACT:
A speech network (11) for a telephone set including a receiver (12) circuit and a transmitter (13) circuit connected in parallel between a tip lead (16) and a ring lead (17). An amplifying transistor (Q4) can be connected in either of two modes, including a normal receive mode for amplifying received signals from the line and applying the amplified receive signal to the receiver circuit. A voice-operated switching unit (Q6,20) is provided for sensing a voice-signal output from the transmitter and connecting the transistor (Q4) in a transmit mode, in which the transistor amplifies the transmitter output for transmission to the line. A sidetone generating circuit (R31, Q5) is connected in parallel with the receiver circuit in the transmit node, for applying a reduced portion of the amplified transmit signal to the receiver.

REFERENCES:
patent: 2842623 (1958-07-01), Lehr
patent: 3283074 (1966-11-01), Csicsatka
patent: 3588359 (1971-06-01), Cribb
patent: 3849603 (1974-11-01), Proios
patent: 3860756 (1975-01-01), Shinoi et al.
patent: 3876835 (1975-04-01), Barnaby et al.
W. F. Chow et al., "MAC-4: A Single-Chip Microcomputer", Bell System Technical Journal, vol. 58, No. 4, pp. 959-962, Apr. 1979.

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