US 9,813,808 B1
Adaptive directional audio enhancement and selection
Jun Yang, San Jose, CA (US)
Assigned to Amazon Technologies, Inc., Seattle, WA (US)
Filed by Amazon Technologies, Inc., Seattle, WA (US)
Filed on Mar. 14, 2013, as Appl. No. 13/826,740.
Int. Cl. H04R 3/00 (2006.01)
CPC H04R 3/005 (2013.01) 20 Claims
OG exemplary drawing
 
1. A hands-free audio system, comprising:
a speaker configured to generate audio based at least in part on a received output audio signal;
a microphone array comprising a plurality of spatially separated microphones, wherein an individual microphone of the plurality of spatially separated microphones produces a respective individual audio signal, wherein the respective individual audio signal potentially contains a near-end voice component and interference with respect to the near-end voice component, and wherein the interference comprises one or more of (a) an ambient noise component or (b) an acoustic echo component resulting from the audio;
one or more interference suppressors configured to produce processed audio signals by suppressing the interference in the individual audio signals based, at least in part on, a reference audio signal;
one or more audio beamformers, an individual beamformer of the one or more audio beamformers being configured to produce a directional audio signal based at least in part on the processed audio signals, wherein the directional audio signal emphasizes sound from a particular direction relative to the microphone array;
one or more voice activity detectors, wherein a voice activity detector of the one or more voice activity detectors is configured to detect at least one of a presence of the near-end voice component in the directional audio signal or a presence of a far-end voice component in the directional audio signal;
one or more signal energy measurers, wherein a signal energy measurer of the one or more signal energy measurers is configured to measure a signal energy of the directional audio signal; and
a signal selector configured to select the directional audio signal based at least in part on (a) the presence of the near-end voice component detected by the voice activity detector in the directional audio signal, (b) the presence of the far-end voice component detected by the voice activity detector in the directional audio signal, and (c) the signal energy measured by the signal energy measurer.