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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
INVENTIONS INC.WILMINGTON, DE0

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Quinn, Chester P Chamblee, GA 4 221
Szlam, Aleksander Marietta, GA 33 2608

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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TELTONE CORPORATION (1)
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SFA/DATACOMM, INC. A CORP. OF MARYLAND (1)
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* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
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7,315,811 System and method for accented modification of a language model 25 2004
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8,782,088 Categorization of information using natural language processing and predefined templates 2 2012
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8,694,335 Methods and apparatus for applying user corrections to medical fact extraction 0 2012
9,396,166 System and method for structuring speech recognized text into a pre-selected document format 0 2012
9,251,129 Method, system, and computer-readable medium for creating a new electronic document from an existing electronic document 0 2012
9,128,906 Text segmentation and label assignment with user interaction by means of topic specific language models, and topic-specific label statistics 0 2014
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* Cited By Examiner