Patent ID: 9349386
Filing Date: 2016-05-24
CPC Classification: G06F,G10L

Claim Text:
1. A method executed by a voice activity detector (VAD) comprising a processor, wherein the method comprises: generating a first data from a sensor according to a first sampling rate; deriving a second data from a normalized envelope of a subset of the first data according to a second sampling rate that is less than the first sampling rate; comparing the second data with a first negative peak value; detecting an activity if a difference between the second data and the first peak value exceeds a predetermined threshold; comparing the second data with a second negative peak value; incrementing the second negative peak value by a fixed amount to obtain the first negative peak value if the second data is not less than the second negative peak value during a predetermined number of clock cycles; and setting the first negative peak value to the second negative peak value if the second data is less than the second negative peak value.