H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
354/50, 379/57
H04Q 1/46 (2006.01) G10L 3/00 (1990.01)
Patent
CA 1293060
AT9-85-015 METHOD AND APPARATUS FOR VOICE DETECTION HAVING ADAPTIVE SENSITIVITY Abstract This invention enables voice energy to be distin- guished from energy due to other sources such as telephone call progress signals. A portion of the audio spectrum is divided into a high and into a low frequency band and the energy content of these bands is examined. The audio energy of a signal is passed through a set of filters and compared. A frequency boundary crossing of an input signal subsequent to filtering is used to signify the receipt of a voice signal. By operating in this manner, voice, whose predominant frequency switches in a random fashion from being greater than to less than a cutoff frequen- cy, can be distinguished from other signals either below or above the cutoff frequencies of the filters. The detection of voice energy is not begun until a predetermined threshold of energy has been received for a specified period of time. This specified period of time need not be continuous after a ringback signal is received. Subsequent to the receipt of a ringback signal the voice detection mechanism will proceed as long as the total time above the threshold exceeds the specified time.
520181
Einkauf Mark A.
West Lynn P.
International Business Machines Corporation
Saunders Raymond H.
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