Ringing detection circuit

Details Ringing detection circuit Ringing detection circuit

1986-04-04

1987-07-07

Rubinson, Gene Z.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

328136, 328138, 307351, H04M 100

Patent

active

046792295

ABSTRACT:
A ringing detection circuit for accurately detecting a ringing having opposite polarities which arrive over a telephone subscriber's line. After the detection of the fact that the AC waveform of the ringing has reached a predetermined level in one of the polarities, variations in the waveform in that polarity are neglected until the waveform reaches a predetermined level in the other polarity. This allows a ringing to be detected with accuracy without responding to distortions of the ringing.

REFERENCES:
patent: 4066848 (1978-01-01), Darwood
patent: 4390843 (1983-06-01), Betts et al.
patent: 4496797 (1985-01-01), Price
Harr, Peak Detector Comparator, Nov. 1974, vol. 17, No. 6.

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