Acoustic feedback suppression device particulary for auxiliary r

Details Acoustic feedback suppression device particulary for auxiliary r Acoustic feedback suppression device particulary for auxiliary r

1993-02-16

1995-10-17

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379372, 379375, 379387, 361119, H02H 900

Patent

active

054597838

ABSTRACT:
An acoustic feedback suppression device, particularly for auxiliary ringers in plug-in telephone systems, includes diodes in addition to a rectifier bridge of the ringer. The circuit provides direct-current decoupling and limits the AC voltage present across the auxiliary ringer.

REFERENCES:
patent: 4107476 (1978-08-01), Henderson
patent: 4152549 (1979-05-01), Ceruti et al.
patent: 4213012 (1980-07-01), Caroll et al.
patent: 4941063 (1990-07-01), McCartney et al.
patent: 4991051 (1991-02-01), Hung

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