Active speech network circuit for a telephone set

Details Active speech network circuit for a telephone set Active speech network circuit for a telephone set

1979-12-13

1982-06-01

Tupper, Robert S.

179 81A, H04M 100

Patent

active

043329845

ABSTRACT:
In a subscriber telephone set, an active speech network provides a sidetone signal and for equalization of the transmit and receive signals at the tip and ring line port and also maintains the dc voltage at a substantially constant level at this port. The network is compatible with conventional telephone sets and operation on long loops in parallel with such sets is provided for. Internal circuitry (320) within the network check both loop current and tip-to-ring voltage to ensure that both are of a magnitude sufficient for a tone signaling dial (301) to properly generate tone signals before enabling the dial.

REFERENCES:
patent: 3546395 (1970-12-01), Schuh
patent: 3973082 (1976-08-01), van der Plaats
patent: 3989902 (1976-11-01), Cowpland
patent: 4071713 (1978-01-01), Senzer
patent: 4143247 (1979-03-01), Yoshitoshi et al.

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