Bell signal generating circuit

Details Bell signal generating circuit Bell signal generating circuit

1993-08-19

1994-08-02

Dwyer, James L.

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379251, 379252, H04M 302

Patent

active

053352700

ABSTRACT:
A bell signal generating circuit for a key telephone set. A dc component of a pulse signal is removed by a photo-coupler to generate a first signal. A high frequency component of the first signal is removed by a filter to generate a second signal. A differential amplifier amplifies the second signal to generate a bell signal. To the differential amplifier, a dc supply voltage based on the dc signal in synchronism when the pulse signal is applied.

REFERENCES:
patent: 4340785 (1982-07-01), Awadalla
patent: 4656659 (1987-04-01), Chea, Jr.

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