Method and apparatus for improved voicing determination in speech signals containing high levels of jitter
First Claim
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1. A method of encoding speech comprising the steps of:
- formulating a speech signal from utterances spoken by a speaker;
determining an estimate of periodicity from the formulated signal;
modifying the formulated signal using the periodicity estimate such that the periodicity is improved; and
encoding the modified signal in a speech encoder.
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Abstract
In an embodiment of the invention, a method is presented to minimize the effect of pitch jitter in voicing determination of sinusoidal speech coders during voiced speech. In the method, the pitch of the input signal is normalized to a fixed value prior voicing determination in the analysis frame. After that, conventional voicing determination approaches can be used for the normalized signal. Based on experiments done, the method has been shown to improve the performance of sinusoidal speech coders during jittery voiced speech by increasing the accuracy of voicing classification decisions of speech signals.
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Citations
18 Claims
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1. A method of encoding speech comprising the steps of:
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formulating a speech signal from utterances spoken by a speaker;
determining an estimate of periodicity from the formulated signal;
modifying the formulated signal using the periodicity estimate such that the periodicity is improved; and
encoding the modified signal in a speech encoder. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for generating a modified signal suitable for use with an speech encoder/decoder comprising:
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means for formulating a speech signal from utterances spoken by a speaker;
means for determining an estimate of periodicity from the formulated signal;
means for modifying the formulated signal using the periodicity estimate such that the periodicity is improved; and
means for encoding the modified signal in the speech encoder/decoder. - View Dependent Claims (9, 10, 11, 13, 14, 16, 17, 18)
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12. A mobile device comprising:
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a speech coder;
means for formulating a speech signal from utterances spoken by a speaker;
means for determining an estimate of periodicity from the formulated signal;
means for modifying the formulated signal using the periodicity estimate such that the periodicity is improved; and
means for encoding the modified signal in the speech coder.
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15. A network element comprising:
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means for formulating a speech signal from utterances spoken by a speaker;
means for determining an estimate of periodicity from the formulated signal;
means for modifying the formulated signal using the periodicity estimate such that the periodicity is improved; and
means for encoding and decoding speech signals using the modified signal.
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Specification