Circuit arrangement for generating an acoustic ringing signal in

Details Circuit arrangement for generating an acoustic ringing signal in Circuit arrangement for generating an acoustic ringing signal in

1986-02-05

1988-02-02

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379375, H04M 126

Patent

active

047232757

ABSTRACT:
A subscriber telephone set which comprises a multifrequency dialing tone oscillator, a microprocessor connected thereto for controlling selection of the tones produced thereby, and an acoustic signal element for producing a ringing sound corresponding to ringing tones applied thereto. The microprocessor prevents incorrect triggering of the acoustic signal element by noise voltages on the subscriber line by verifying that the amplitude of the ringing current received on the line exceeds a predetermined level, and also that the ringing current frequency corresponds to the frequency of a resetting signal internally generated within the microprocessor. Upon such verification, the microprocessor controls the dialing tone oscillator to generate a ringing tone which is applied to the acoustic signal element to cause it to generate a ringing sound, the dialing tone oscillator thereby also serving as a ringing tone generator for activating the acoustic signal element.

REFERENCES:
patent: 4491691 (1985-01-01), Embree et al.
patent: 4571462 (1986-02-01), Janssen
All Telephone Functions in One Chip PBL3780, Bengt Berg, #No. 3, 1985, Ericsson Review.
LSI for Telecommunications, David W. Pace, Apr. 1984, Telecommunications North American Edition.

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