Method and apparatus for detecting signaling tones in wide-band

Details Method and apparatus for detecting signaling tones in wide-band Method and apparatus for detecting signaling tones in wide-band

1996-02-01

1999-07-27

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

370326, 375229, H03L 2706, H03D 324

Patent

active

059303085

ABSTRACT:
A cellular-telephone-system base station (10) employs a digital band-exclusion filter (30) to detect a supervisory tone, but the filter's record length is shorter than that dictated by the necessary resolution and produces output values at a frequency much lower than the frequency of the supervisory tone. A second filter (32) receives the output, operating on a record whose time duration is long enough to achieve the necessary frequency resolution. The second filter's coefficients are chosen to match the frequency of the signal to which the previous filter's subsampling translates the frequency of the supervisory tone. In this way, the supervisory tone can be detected with the necessary resolution but at storage computational costs less than the input sample rate and required frequency resolution would seem to require.

REFERENCES:
patent: 4510601 (1985-04-01), Delpit et al.
patent: 5241688 (1993-08-01), Arora
patent: 5392348 (1995-02-01), Park et al.
patent: 5572588 (1996-11-01), Weng et al.

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