Apparatuses and methods for enhanced speech recognition in variable environments
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United States of America Patent
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Apr 18, 2023
Grant Date -
Apr 20, 2017
app pub date -
Oct 18, 2015
filing date -
Oct 18, 2015
priority date (Note) -
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Abstract
Systems, apparatuses, and methods are described to increase a signal-to-noise ratio difference between a main channel and reference channel. The increased signal-to-noise ratio difference is accomplished with an adaptive threshold for a desired voice activity detector (DVAD) and shaping filters. The DVAD includes averaging an output signal of a reference microphone channel to provide an estimated average background noise level. A threshold value is selected from a plurality of threshold values based on the estimated average background noise level. The threshold value is used to detect desired voice activity on a main microphone channel.
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