The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 1999
Filed:
Mar. 10, 1997
Yair Shoham, Watchung, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
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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