Adaptive directional audio enhancement and selection
First Claim
Patent Images
1. An electronic device comprising:
- a first microphone;
a second microphone;
one or more processors; and
one or more computer-readable media storing instructions that, when executed by the one or more processors, cause the one or more processor to perform operations comprising;
generating a first audio signal using the first microphone;
generating a second audio signal using the second microphone;
producing a first directional audio signal based at least in part on the first audio signal and the second audio signal;
producing a second directional audio signal based at least in part on the first audio signal and the second audio signal;
detecting presence of near-end audio in the first directional audio signal;
detecting presence of far-end audio in the second directional audio signal;
determining a first signal energy associated with the first directional audio signal;
determining a second signal energy associated with the second directional audio signal;
determining that the first signal energy is greater than the second signal energy;
selecting the first directional audio signal based at least in part on the presence of the near-end audio in the first directional audio signal and based at least in part on the first signal energy being greater than the second signal energy; and
sending the first directional audio signal.
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Abstract
A hands-free audio device has a receive path and a transmit path, which may operate at different audio sampling rates. The transmit path has an interference suppressor that receives a reference signal from the receive path and that suppresses interference in microphone signals received from a microphone array. The interference suppressor is followed in the transmit path by a multi-channel adaptive beamformer that produce a plurality of directional audio signals. A beam selector is configured to select one of the directional audio signals based on voice activity, echo detection, and signal energy.
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Citations
20 Claims
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1. An electronic device comprising:
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a first microphone; a second microphone; one or more processors; and one or more computer-readable media storing instructions that, when executed by the one or more processors, cause the one or more processor to perform operations comprising; generating a first audio signal using the first microphone; generating a second audio signal using the second microphone; producing a first directional audio signal based at least in part on the first audio signal and the second audio signal; producing a second directional audio signal based at least in part on the first audio signal and the second audio signal; detecting presence of near-end audio in the first directional audio signal; detecting presence of far-end audio in the second directional audio signal; determining a first signal energy associated with the first directional audio signal; determining a second signal energy associated with the second directional audio signal; determining that the first signal energy is greater than the second signal energy; selecting the first directional audio signal based at least in part on the presence of the near-end audio in the first directional audio signal and based at least in part on the first signal energy being greater than the second signal energy; and sending the first directional audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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receiving a first audio signal from a first microphone; receiving a second audio signal from a second microphone; producing directional audio signals based at least in part on the first audio signal and the second audio signal; detecting presence of near-end audio in at least one of the directional audio signals; detecting presence of far-end audio in at least one of the directional audio signals; determining a signal energy associated with a first directional audio signal of the directional audio signals; selecting the first directional audio signal based at least in part on the presence of the near-end audio and the signal energy; and sending the first directional audio signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A system comprising:
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one or more processors; and one or more computer-readable media storing instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising; receiving a first audio signal; receiving a second audio signal; producing directional audio signals based at least in part on the first audio signal and the second audio signal; detecting presence of far-end audio in at least one of the directional audio signals; determining a signal energy associated with a first directional audio signal of the directional audio signals; determining a second signal energy associated with a second directional audio signal of the directional audio signals; determining that the second signal energy is greater than the first signal energy; selecting the first directional audio signal based at least in part on the presence of the far-end audio and the second signal energy being greater than the first signal energy; and sending the first directional audio signal. - View Dependent Claims (18, 19, 20)
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Specification