Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1994-11-30
1998-11-17
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704212, 704265, 704501, G10L 918
Patent
active
058391029
ABSTRACT:
A method and apparatus which allows the transmission of the perceptually important features of a speech-coding parameter at a low bit rate. The speech coding parameter may, for example, comprise the signal power of the speech. The parameter is processed on a block by block basis. The parameter value at the block boundaries is transmitted by conventional methods such as, for example, by means of differential quantization. The shape of the reconstructed parameter contour within block boundaries is based on a classification. The classification determines perceptually important features of the parameter contour within a block. The classification can be performed either at the transmitting end of the coder (using, for example, the original parameter contour with high time resolution and possibly other speech parameters as well) or at the receiving end of the coder (using, for example, the transmitted parameter values, and possibly other transmitted speech parameters as well). Based on the result of the classification as well as the parameter values at the block boundaries, a parameter contour (within the block) is selected from an inventory of possible parameter contours. The inventory may include a linear interpolation contour and a step function contour. The step function contour may be particularly useful when the features indicate the presence of a plosive. The inventory may adapt to the transmitted parameter values at the block boundaries.
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U. S. Patent application "Method And Apparatus For Prototype Waveform Speech Coding" by W. B. Kleijn, Ser. No. 08/179,831.
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Haagen Jesper
Kleijn Willem Bastiaan
Brown Kenneth M.
Hudspeth David R.
Lucent Technologies - Inc.
Storm Donald L.
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