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Abstract

Voice detector for detecting whether a telephone signal has been produced by a voice. The voice detector obtains, on a per frame basis, measures of the following quantities relating to the telephone signal: total energy; energy and frequency of two largest energy peaks in a frequency spectrum; and signal-to-noise ratio (SNR). If the measure of total energy exceeds a predetermined threshold, the voice detector increments running sums of the following measures: total energy; frequency of the largest peak in the frequency spectrum; and SNR. Until a predetermined number of frames, referred to as a window, has been reached, for each frame, the voice detector determines whether the telephone signal was produced by ringing (incrementing a ring count if it was) and whether there is a local energy maximum (incrementing a local energy maximum count if there was). When the window is reached, the voice detector determines whether, during the window, the telephone signal was produced by ringback (updating adaptive, signal-to-noise and energy parameters if it was). If the telephone signal was not produced by ringback, the voice detector determines whether the telephone signal was produced by a voice by analyzing the running sums, the ring count, the local energy maximum count, and the adaptive, signal-to-noise and energy parameters.

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First Claim