Data processing: speech signal processing – linguistics – language – Speech signal processing – Synthesis
Patent
1997-03-10
1999-05-11
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
Synthesis
G10L5/02;9/00
Patent
active
059038667
ABSTRACT:
A low-complexity method and apparatus for performing waveform interpolation in a low bit-rate WI speech decoder, wherein interpolation between received waveforms is performed with use of spline coefficients generated based thereupon. Specifically, two signals are received from a WI encoder, each comprising a set of frequency domain parameters representing a speech signal segment of a corresponding pitch period. Then, spline coefficients are generated from each of the received signals, wherein each set of spline coefficients comprises a spline representation of a time domain transformation of the corresponding set of frequency domain parameters. Finally, the decoder interpolates between the spline representations to generate interpolated time domain data which is used to synthesize a reconstructed speech signal. In certain embodiments of the present invention, the time scale of at least one of the spline representations is modified to enable the interpolation therebetween. Also, in accordance with one illustrative embodiment of the present invention, a cubic spline representation is used, while in accordance with another illustrative embodiment, a novel variant of a cardinal spline representation is advantageously employed.
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Brown Kenneth M.
Hudspeth David R.
Lucent Technologies - Inc.
Sax Robert Louis
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