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Primary Examiner: Cooper, William C.
Assistant Examiner: Popek, Joseph
Attorney: Albrecht; J. C.

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Title: Tone detector using spectrum parameter estimation

Abstract: A tone detector circuit for detecting the presence of a certain tone or tones in an input signal. An estimate is calculated for each of the following three parameters of the band limited spectrum of the input signal: total power, power mean frequency, and mean square power bandwidth. Each of the three input spectrum parameters is compared to the same parameter of the tone or tones desired to be detected. If a match within certain bounds occurs on all three parameters, the desired signal has been detected.

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Inventors: Denenberg, Jeffrey Neil (Naperville, IL, US)

Application Number: 545410
Filing Date: 1975-01-30
Publication_date: 1976-02-10
Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ)
Primary Class(es): 702/74 327/47, 379/282
Other Classes:
US Patent Ref:

3652805	Mar, 1972	Wisner	179/84.
3882283	May, 1975	Proudfoot	179/84.

Other Refs: Other References: J. N. Denenberg and L. G. Peach, "Estimation of Spectral Moments", Proceedings Ninth Annual Allerton Conference on Circuit & System Theory, Oct. 6-8, 1971, p. 1085.