Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
1996-08-26
1998-04-07
Zele, Krista
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
379351, 381 56, 395 242, H04M 910, H04M 908, G10L 300, G10L 918
Patent
active
057374074
ABSTRACT:
A method of detecting voice in an audio signal comprises the steps of determining an average peak value representing an envelope of the audio signal, determining a running instance of audio signal standard deviation, which corresponds to one of a number of overlapping time intervals, and updating a power density function (PDF) by adding instances of noise to the PDF if the average peak of the audio signal exceeds the current level of the audio signal by a certain amount and if the current standard deviation value fails below a threshold for a predetermined time interval. A noise floor is located based on the mean value of the PDF, and, if the audio signal sustains a power level exceeding the noise floor, voice activity is determined to be present in the audio signal. The PDF is updated by a low confidence factor if all of the standard deviation values calculated during a certain period of time are below the threshold value and by a high confidence factor if all standard deviation values within a certain longer period of time period are below the threshold value.
REFERENCES:
patent: 4426730 (1984-01-01), Lajotte et al.
patent: 5533118 (1996-07-01), Cesaro et al.
patent: 5548638 (1996-08-01), Yamaguchi et al.
patent: 5579389 (1996-11-01), Wagner et al.
patent: 5617508 (1997-04-01), Reaves
Intel Corporation
Kumar T. Devendra
Zele Krista
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