Apparatus and method for noise immunity during signal detection

Details Apparatus and method for noise immunity during signal detection Apparatus and method for noise immunity during signal detection

2007-06-26

2007-06-26

Harold, Jefferey F. (Department: 2614)

Telephonic communications

Supervisory or control line signaling

Signal receiver

C379S372000, C370S526000

Reexamination Certificate

active

10159052

ABSTRACT:
A noise calculation mechanism is incorporated into a cadence tone detector which upon a miss in either a energy or silence interval allows for retention of those periods corresponding to noise and augments the appropriate energy and silence interval.

REFERENCES:
patent: 5479501 (1995-12-01), Lai
patent: 5483593 (1996-01-01), Gupta et al.
patent: 5719932 (1998-02-01), Robybal
patent: 2002/0031205 (2002-03-01), Kicklighter et al.
U.S. Appl. No. 10/161,491, filed Aug. 31, 2002, L.J. Robybal.

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