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

H - Electricity

04

M

379/80

H04M 1/58 (2006.01) H04M 1/50 (2006.01)

Patent

CA 1152242

ACTIVE SPEECH NETWORK CIRCUIT FOR A TELEPHONE SET Abstract of the Disclosure An active speech network for a telephone set provides a sidetone signal, equalizes the transmit and receive signals at the tip and ring line port, and maintains the dc voltage at a substantially constant level at this port. The active speech network is compatible with conventional telephone sets and operation on long loops in parallel with such sets is provided for. The network includes circuitry which checks both loop current and tip- to-ring voltage to ensure that both are of a magnitude sufficient for a tone signaling dial to properly generate tone signals.

365316

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