Decomposition in noise and periodic signal waveforms in waveform interpolation
First Claim
1. A method of coding a speech signal, the method comprising the steps of:
- 1. generating a time-ordered sequence of sets of parameters based on samples of the speech signal, each set of parameters corresponding to a waveform characterizing the speech signal;
2. grouping parameters of the plurality of sets based on index values for said parameters to form a first set of signals which set represents an evolution of characterizing waveform shape across the time-ordered sequence of sets;
3. filtering signals of the first set to remove low-frequency components of said signals evolving over time at low frequencies, wherein said filtering produces a second set of signals which second set represents relatively high rates of evolution of characterizing waveform shape; and
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Abstract
A method of coding a speech signal is described. In accordance with the method, a plurality of sets of indexed parameters are generated based on samples of the speech signal. Each set of indexed parameters corresponds to a waveform characterizing the speech signal at a discrete point in time. Parameters of the plurality of sets are grouped based on index value to form a first set of signals which represents the evolution of characterizing waveform shape; the signals of the first set are filtered to remove low frequency components and thereby produce a second set of signals which represents relatively high rates of evolution of characterizing waveform shape. The speech signal is then coded based on the second set of signals representing high rates of characterizing waveform shape evolution. Coding of the speech signal may further be based on a set of smoothed first signals.
124 Citations
22 Claims
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1. A method of coding a speech signal, the method comprising the steps of:
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1. generating a time-ordered sequence of sets of parameters based on samples of the speech signal, each set of parameters corresponding to a waveform characterizing the speech signal; 2. grouping parameters of the plurality of sets based on index values for said parameters to form a first set of signals which set represents an evolution of characterizing waveform shape across the time-ordered sequence of sets; 3. filtering signals of the first set to remove low-frequency components of said signals evolving over time at low frequencies, wherein said filtering produces a second set of signals which second set represents relatively high rates of evolution of characterizing waveform shape; and - View Dependent Claims (3, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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- 2. coding said speech signal based on the second set of signals.
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20. A method of coding a speech signal, the method comprising the steps of:
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1. generating a time-ordered sequence of sets of parameters based on samples of a speech signal, each set of parameters corresponding to a waveform characterizing the speech signal; 2. grouping parameters of the plurality of sets based on index values for said parameters to form a first set of signals which set represents an evolution of characterizing waveform shape across the time-ordered sequence of sets;
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21. filtering signals of the first set to remove components of said signals evolving over time at high frequencies, wherein said filtering produces a second set of signals which second set represents relatively low rates of evolution of characterizing waveform shape;
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4. coding said speech signal based on the second set of signals.
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22. A method of coding a speech signal using a set of fixed codebooks, the speech signal comprising sequential sets of samples of said speech signal, each set of samples specifying the value of said signals at a specific point in time, the method comprising the steps of:
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coding a first set of samples of the speech signal with a first codebook; and coding a different time-successive set of samples of the speech signal with a codebook other than said first codebook.
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Specification