Patent ID: 9401160
Filing Date: 2016-07-26
CPC Classification: G10L

Claim Text:
1. A method, in a voice activity detector, for determining whether frames of an input signal comprise voice, wherein the voice activity detector comprises the steps, which are implemented by a processor, of: receiving a frame of the input signal; determining a first signal-to-noise-ratio (SNR) of the received frame by: comparing the determined first SNR with an adaptive threshold, wherein the adaptive threshold is at least based on total noise energy of a noise level, an estimate of a second SNR, wherein the second SNR being a long term SNR, and energy variation between different frames being an estimate of envelope tracking of frame to frame energy variation for noise frames with limitations on how quickly the estimate increases such that the estimate may not increase beyond a fixed constant for each frame; and detecting whether the received frame comprises voice based on the comparison.