Estimation of excitation parameters
First Claim
1. A method of analyzing a digitized speech signal to determine excitation parameters for the digitized speech signal, comprising the steps of:
- dividing the digitized speech signal into at least two frequency band signals;
performing a nonlinear operation on at least one of the frequency band signals to produce at least one modified frequency band signal, wherein the nonlinear operation is an operation that emphasizes a fundamental frequency of the digitized speech signal so that the modified frequency band signal includes a component corresponding to the fundamental frequency even when the at least one frequency band signal does not include such a component; and
for at least one modified frequency band signal, determining whether the modified frequency band signal is voiced or unvoiced.
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Abstract
A method of encoding speech analyzes a digitized speech signal to determine excitation parameters for the digitized speech signal. The method includes dividing the digitized speech signal into at least two frequency bands, performing a nonlinear operation on at least one of the frequency bands to produce a modified frequency band, and determining whether the modified frequency band is voiced or unvoiced. The nonlinear operation is an operation that emphasizes a fundamental frequency of the digitized speech signal so that the modified frequency band signal includes a component corresponding to the fundamental frequency even when the at least one frequency band signal does not include such a component.
65 Citations
35 Claims
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1. A method of analyzing a digitized speech signal to determine excitation parameters for the digitized speech signal, comprising the steps of:
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dividing the digitized speech signal into at least two frequency band signals; performing a nonlinear operation on at least one of the frequency band signals to produce at least one modified frequency band signal, wherein the nonlinear operation is an operation that emphasizes a fundamental frequency of the digitized speech signal so that the modified frequency band signal includes a component corresponding to the fundamental frequency even when the at least one frequency band signal does not include such a component; and for at least one modified frequency band signal, determining whether the modified frequency band signal is voiced or unvoiced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of analyzing a digitized speech signal to determine excitation parameters for the digitized speech signal, comprising the steps of:
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dividing the digitized speech signal into at least two frequency band signals; performing a nonlinear operation on a first one of the frequency band signals to produce a first modified frequency band signal, wherein the nonlinear operation is an operation that emphasizes a fundamental frequency of the digitized speech signal so that the first modified frequency band signal includes a component corresponding to the fundamental frequency even when the first one of the frequency band signals does not include such a component; combining the first modified frequency band signal and at least one other frequency band signal to produce a combined frequency band signal; and estimating the fundamental frequency of the combined frequency band signal.
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30. A method of analyzing a digitized speech signal to determine excitation parameters for the digitized speech signal, comprising the steps of:
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dividing the digitized speech signal into at least two frequency band signals; performing a nonlinear operation on at least one of the frequency band signals to produce at least one modified band signal, wherein the nonlinear operation is an operation that emphasizes a fundamental frequency of the digitized speech signal so that the modified frequency band signal includes a component corresponding to the fundamental frequency even when the at least one of the frequency band signals does not include such a component; and estimating the fundamental frequency from at least one modified band signal.
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31. A method of analyzing a digitized speech signal to determine the fundamental frequency for the digitized speech signal, comprising the steps of:
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dividing the digitized speech signal into at least two frequency band signals; performing a nonlinear operation on at least two of the frequency band signals to produce at least two modified frequency band signals, wherein the nonlinear operation is an operation that emphasizes a fundamental frequency of the digitized speech signal so that the modified frequency band signals include a component corresponding to the fundamental frequency even when the corresponding frequency band signal does not include such a component; combining the at least two modified frequency band signals to produce a combined signal; and estimating the fundamental frequency of the combined signal.
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32. A system for encoding speech by analyzing a digitized speech signal to determine excitation parameters for the digitized speech signal, comprising:
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means for dividing the digitized speech signal into at least two frequency band signals; means for performing a nonlinear operation on at least one of the frequency band signals to produce at least one modified frequency band signal, wherein the nonlinear operation is an operation that emphasizes a fundamental frequency of the digitized speech signal so that the modified frequency band signal includes a component corresponding to the fundamental frequency even when the at least one frequency band signal does not include such a component; and means for determining, for at least one modified frequency band signal, whether the modified frequency band signal is voiced or unvoiced. - View Dependent Claims (33, 34, 35)
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Specification