LOW LATENCY AND MEMORY EFFICIENT KEYWORK SPOTTING
First Claim
1. A system comprising:
- a computer-readable memory storing executable instructions; and
one or more processors in communication with the computer-readable memory, wherein the one or more processors are programmed by the executable instructions to at least;
obtain a sequence of feature vectors, wherein the sequence of feature vectors represents at least a portion of a stream of audio data;
generate a keyword score based at least partly on a likelihood that a particular feature vector of the sequence of feature vectors represents audio data corresponding to a keyword;
generate a background score based at least partly on a likelihood that the particular feature vector represents audio data corresponding to background audio;
determine that a difference between the keyword score and the background score is greater than differences associated with feature vectors preceding the particular feature vector in a subset of the sequence of feature vectors, wherein the particular feature vector is in a center of the subset;
determine that the difference is greater than differences associated with feature vectors subsequent to the particular feature vector in the subset; and
generate data indicating the particular feature vector corresponds to an end of the keyword.
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Abstract
Features are disclosed for spotting keywords in utterance audio data without requiring the entire utterance to first be processed. Likelihoods that a portion of the utterance audio data corresponds to the keyword may be compared to likelihoods that the portion corresponds to background audio (e.g., general speech and/or non-speech sounds). The difference in the likelihoods may be determined, and keyword may be triggered when the difference exceeds a threshold, or shortly thereafter. Traceback information and other data may be stored during the process so that a second speech processing pass may be performed. For efficient management of system memory, traceback information may only be stored for those frames that may encompass a keyword; the traceback information for older frames may be overwritten by traceback information for newer frames.
71 Citations
20 Claims
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1. A system comprising:
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a computer-readable memory storing executable instructions; and one or more processors in communication with the computer-readable memory, wherein the one or more processors are programmed by the executable instructions to at least; obtain a sequence of feature vectors, wherein the sequence of feature vectors represents at least a portion of a stream of audio data; generate a keyword score based at least partly on a likelihood that a particular feature vector of the sequence of feature vectors represents audio data corresponding to a keyword; generate a background score based at least partly on a likelihood that the particular feature vector represents audio data corresponding to background audio; determine that a difference between the keyword score and the background score is greater than differences associated with feature vectors preceding the particular feature vector in a subset of the sequence of feature vectors, wherein the particular feature vector is in a center of the subset; determine that the difference is greater than differences associated with feature vectors subsequent to the particular feature vector in the subset; and generate data indicating the particular feature vector corresponds to an end of the keyword. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer-implemented method comprising:
under control of one or more computing devices configured with specific computer-executable instructions, generating a first score based at least partly on a likelihood that a frame, of a window of sequential frames of audio data, comprises audio data corresponding to a keyword, wherein the window comprises the frame and an equal quantity of (1) frames before the frame and (2) frames after the frame; generating a second score based at least partly on a likelihood that the frame comprises audio data corresponding to background audio; determining a difference between the first score and the second score; and determining that the frame corresponds to an end of the keyword based at least partly on the difference being greater than differences determined for the frames before the frame, and differences determined for the frames after the frame. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. Non-transitory computer readable storage comprising executable instructions that, when executed, cause one or more computing devices to perform a process comprising:
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generating a first score based at least partly on a likelihood that a frame, of a window of sequential frames of audio data, comprises audio data corresponding to a keyword, wherein the window comprises the frame and an equal quantity of (1) frames before the frame and (2) frames after the frame; generating a second score based at least partly on a likelihood that the frame comprises audio data corresponding to background audio; determining a difference between the first score and the second score; and determining that the frame corresponds to an end of the keyword based at least partly on the difference being greater than differences determined for the frames before the frame, and differences determined for the frames after the frame. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification