Detecting self-generated wake expressions
First Claim
1. An audio device configured to respond to a trigger expression uttered by a user, comprising:
- a speaker configured to generate output audio;
a microphone array configured to produce a plurality of input audio signals;
an audio beamformer configured to produce a plurality of directional audio signals based at least in part on the input audio signals, wherein the directional audio signals represent audio from respectively corresponding directions relative to the audio device;
one or more speech recognition components configured to detect that the trigger expression occurs in the audio represented by each of the respective directional audio signals; and
an expression detector configured to;
identify two or more directional audio signals, of the plurality of directional audio signals, that each include the trigger expression,determine that a total number of the two or more directional audio signals is less than a threshold number,in response to determining that the total number of the two or more directional audio signals is less than the threshold number, determine that the occurrence of the trigger expression in the audio is a result of an utterance of the trigger expression by a user, andbased at least in part on determining that the occurrence of the trigger expression in the audio is a result of an utterance of the trigger expression by the user, provide a wake notification corresponding to the trigger expression to at least one processor of the audio device to change a state of the audio device.
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Accused Products
Abstract
A speech-based audio device may be configured to detect a user-uttered wake expression and to respond by interpreting subsequent words or phrases as commands. In order to distinguish between utterance of the wake expression by the user and generation of the wake expression by the device itself, directional audio signals may by analyzed to detect whether the wake expression has been received from multiple directions. If the wake expression has been received from many directions, it is declared as being generated by the audio device and ignored. Otherwise, if the wake expression is received from a single direction or a limited number of directions, the wake expression is declared as being uttered by the user and subsequent words or phrase are interpreted and acted upon by the audio device.
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Citations
17 Claims
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1. An audio device configured to respond to a trigger expression uttered by a user, comprising:
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a speaker configured to generate output audio; a microphone array configured to produce a plurality of input audio signals; an audio beamformer configured to produce a plurality of directional audio signals based at least in part on the input audio signals, wherein the directional audio signals represent audio from respectively corresponding directions relative to the audio device; one or more speech recognition components configured to detect that the trigger expression occurs in the audio represented by each of the respective directional audio signals; and an expression detector configured to; identify two or more directional audio signals, of the plurality of directional audio signals, that each include the trigger expression, determine that a total number of the two or more directional audio signals is less than a threshold number, in response to determining that the total number of the two or more directional audio signals is less than the threshold number, determine that the occurrence of the trigger expression in the audio is a result of an utterance of the trigger expression by a user, and based at least in part on determining that the occurrence of the trigger expression in the audio is a result of an utterance of the trigger expression by the user, provide a wake notification corresponding to the trigger expression to at least one processor of the audio device to change a state of the audio device. - View Dependent Claims (2, 3, 4)
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5. A method comprising:
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producing, by a speaker included in an audio device, output audio in a user environment; receiving, from a microphone array of the audio device, a plurality of audio signals representing input audio; generating, for each of the plurality of audio signals, a recognition parameter indicating whether a corresponding audio signal includes a predefined expression; identifying, based at least in part on the recognition parameters, two or more audio signals, of the plurality of audio signals, that include the predefined expression; determining that a total number of the two or more audio signals is more than a threshold number; and based at least in part on the determining that the total number of the two or more audio signals is more than the threshold number, determining that an occurrence of the predefined expression in the input audio is a result of the predefined expression occurring in the output audio from the speaker. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. An audio device comprising:
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one or more processors; a plurality of microphones; an audio speaker configured to produce output audio; memory storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform acts comprising; receiving, from the plurality of microphones, a plurality of audio signals representing input audio; generating, by the one or more processors for each of the plurality of audio signals, an indication indicating whether a corresponding audio signal contains a predefined expression; generating a parameter that indicates at least one of whether or not the output audio is currently being produced, whether or not the output audio contains speech, loudness of the output audio, or an echo characteristic of one or more of the plurality of audio signals; identifying, based at least in part on the indications, two or more audio signals, of the plurality of audio signals, that include the predefined expression; determining, based at least in part on the two or more audio signals and the parameter, that an occurrence of the predefined expression in the input audio is a result of an utterance of the predefined expression by a user; and in response to the determining, providing a wake notification corresponding to the predefined expression to the one or more processors to change a state of the audio device. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification