Adaptive filter pitch extraction
First Claim
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1. A system for estimating pitch, comprising:
- a discrete input configured to receive a speech signal;
a delay unit coupled with the discrete input and configured to delay the speech signal;
an adaptive filter coupled with the delay unit and configured to process the speech signal output from the delay unit; and
a pitch estimator comprising a processor configured to analyze adaptive filter coefficients that define a transfer function of the adaptive filter and estimate a pitch of the speech signal based on the adaptive filter coefficients.
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Abstract
An enhancement system extracts pitch from a processed speech signal. The system estimates the pitch of voiced speech by deriving filter coefficients of an adaptive filter and using the obtained filter coefficients to derive pitch. The pitch estimation may be enhanced by using various techniques to condition the input speech signal, such as spectral modification of the background noise and the speech signal, and/or reduction of the tonal noise from the speech signal.
152 Citations
20 Claims
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1. A system for estimating pitch, comprising:
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a discrete input configured to receive a speech signal; a delay unit coupled with the discrete input and configured to delay the speech signal; an adaptive filter coupled with the delay unit and configured to process the speech signal output from the delay unit; and a pitch estimator comprising a processor configured to analyze adaptive filter coefficients that define a transfer function of the adaptive filter and estimate a pitch of the speech signal based on the adaptive filter coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for estimating pitch, comprising:
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an adaptive filter that comprises adaptive filter coefficients and an input configured to receive a speech signal, where the adaptive filter coefficients define a transfer function of the adaptive filter; and a pitch estimator comprising a processor configured to analyze the adaptive filter coefficients and estimate a pitch of the speech signal based on the adaptive filter coefficients. - View Dependent Claims (12, 13, 14)
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15. A method for estimating pitch, the method comprising:
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receiving a speech signal; delaying the speech signal; passing the delayed speech signal through an adaptive filter; obtaining adaptive filter coefficients that define a transfer function of the adaptive filter; and analyzing the adaptive filter coefficients by a processor to estimate a pitch of the speech signal based on the adaptive filter coefficients. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification