US Patent No: 4,477,698

Number of patents in Portfolio can not be more than 2000

Apparatus for detecting pick-up at a remote telephone set

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Abstract

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An improved combination of a hardware and digital signal processing filter for detecting pick-up of a telephone call, solely through audio information on the telephone line, is disclosed. The apparatus employs a high gain band pass filter (28) with no automatic gain control, the output of which goes to a window comparator (30). The output from the window comparator (31) goes to a digital high pass filter (32) and from there to an integrator 37 for providing a digital output signal (40) indicative of the presence or absence on the telephone line of a signal exceeding a predetermined magnitude within the filter pass band. The digital signal is then processed by an intelligent digital filter having a set of predetermined threshold values of durations for states of the digital output signal, by which determinations of pick-up are made. The digital filter is adaptive and learns the durations high and low states of the digital output signal as they occur, subsequently checking for deviations from previously learned valid values. The digital filter includes a digital phase lock loop which will lock onto a periodic but asymmetric pattern in the digital output signal and declare pick-up when lock is lost.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
INVENTIONS INC.WILMINGTON, DE5

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Quinn, Chester P Chamblee, GA 4 199
Szlam, Aleksander Alpharetta, GA 38 2262

Cited Art Landscape

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Patent Citation Ranking

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