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Identifying directions of acoustically reflective surfaces

  • US 9,294,860 B1
  • Filed: 03/10/2014
  • Issued: 03/22/2016
  • Est. Priority Date: 03/10/2014
  • Status: Expired due to Fees
First Claim
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1. An audio device, comprising:

  • a housing;

    a speaker to generate output audio;

    multiple microphones to produce input audio signals;

    one or more audio beamformers configured to produce multiple directional audio signals from the input audio signals, wherein each of the directional audio signals potentially contains one or more acoustic echoes of the output audio, and wherein each of the directional audio signals emphasizes sound received from a corresponding direction relative to the audio device;

    one or more visual indicators, the one or more visual indicators being controllable to visually indicate different directions relative to the audio device;

    one or more acoustic echo cancellers configured to cancel the one or more acoustic echoes from the directional audio signals based at least in part on sequences of dynamically updated filter coefficients;

    a proximity detector configured to perform acts comprising;

    analyzing the sequences of dynamically updated filter coefficients to identify one of the directional audio signals that contains an acoustic echo originating from a nearest of one or more acoustically reflective surfaces; and

    controlling the one or more visual indicators to indicate the direction of the nearest of the one or more acoustically reflective surfaces.

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