Method and apparatus for signal detection

Details Method and apparatus for signal detection Method and apparatus for signal detection

2006-04-04

2006-04-04

Swerdlow, Daniel (Department: 2646)

Telephonic communications

Supervisory or control line signaling

Signal receiver

C708S312000

Reexamination Certificate

active

07023981

ABSTRACT:
A signal detector for detecting a signal having a first nominal frequency, F1and a second nominal frequency F2, the signal intermixed with an interfering signal to form a composite signal, the signal detector including a first and a second band pass filter centered at F1and F2for filtering the composite signal to provide an F1and F2signal; a parameter estimator for determining an F1and F2period for the F1and F2signal for a sequence of frames and an average period shift (APS) for a current frame and a plurality of earlier frames; a metric calculator for calculating a metric that corresponds to the F1and F2period and the APS; and a decision processor for deciding whether the signal has been detected based in part on a comparison of the metric and a threshold.

REFERENCES:
patent: 4782523 (1988-11-01), Galand et al.
patent: 5353346 (1994-10-01), Cox et al.
patent: 5862212 (1999-01-01), Mathews

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