Voice activity detector
First Claim
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1. A voice activity detection method, comprising:
- calculating, by a processor, a variance of a signal-to-noise ratio across a plurality of portions of a signal;
calculating, by the processor, a value based on the variance of the signal-to-noise ratio;
performing, by the processor, a comparison between the value and a threshold; and
identifying, by the processor, whether the signal contains speech based on the comparison between the value and the threshold.
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Abstract
A voice activity detector indicates the presence of speech within a signal. The detector may determine whether the signal includes speech by calculating a variance of a signal-to-noise ratio across a plurality of portions of a signal, calculating a value based on the variance of the signal-to-noise ratio, performing a comparison between the value and a threshold, and identifying whether the signal contains speech based on the comparison between the value and the threshold.
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Citations
20 Claims
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1. A voice activity detection method, comprising:
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calculating, by a processor, a variance of a signal-to-noise ratio across a plurality of portions of a signal; calculating, by the processor, a value based on the variance of the signal-to-noise ratio; performing, by the processor, a comparison between the value and a threshold; and identifying, by the processor, whether the signal contains speech based on the comparison between the value and the threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A voice activity detection method, comprising:
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dividing, by a processor, a signal into a plurality of wide bands; dividing, by the processor, each of the wide bands into a plurality of bins; determining, by the processor, a noise estimate for each of the wide bands; calculating, by the processor for each of the wide bands, a variance of a signal-to-noise ratio across the bins of each of the wide bands based on the signal and the noise estimate for each of the wide bands; combining, by the processor, the variances calculated for each of the wide bands to derive a value; performing, by the processor, a comparison between the value and a threshold; and identifying, by the processor, whether the signal contains speech based on the comparison between the value and the threshold. - View Dependent Claims (11, 12)
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13. A noise detection system, comprising:
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a computer memory that stores a measurement of a variance of a signal-to-noise ratio across a plurality of portions of a signal; and a processor coupled with the computer memory; where the processor is configured to access the measurement of the variance of a signal-to-noise ratio from the computer memory; where the processor is configured to calculate a value based on the variance of the signal-to-noise ratio; where the processor is configured to perform a comparison between the value and a threshold; and where the processor is configured to identify whether the signal contains speech based on the comparison between the value and the threshold. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification