Speech decoding method and apparatus to control the reproduction

Details Speech decoding method and apparatus to control the reproduction Speech decoding method and apparatus to control the reproduction

1996-10-25

1999-05-04

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704203, 704268, G10L 302

Patent

active

058999663

ABSTRACT:
A signal decoding method and apparatus in which the speech signal reproducing speed is controlled without changing the phoneme or the pitch, in which the apparatus has a data number convertor for converting the number of orthogonal transform coefficients entering a transmission signal input terminal from N to M, an inverse orthogonal transform unit for inverse orthogonal-transforming the M number of the orthogonal transform coefficients obtained by the data number convertor, and a linear predictive coding synthesis filter for performing predictive synthesis based on the short-term prediction residuals obtained by the inverse orthogonal transform unit. For an input signal, short-term prediction residuals are found and are orthogonally transformed to form the orthogonal transform coefficients at a rate of N coefficients per transform unit. The frequency positions of the N transform coefficients may be rearranged to M values by M/N or by oversampling to change N to M. A portable radio terminal embodying the invention is described.

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R. Ansari, Pitch Modification of Speech Using a Low Sensitivity Inverse Filter Approach, vol. 5, No. 3, pp. 60-62 (Mar. 1998).
Eric Moulines and Francis Charpentier, "Pitch-Synchronous Waveform Processing Techniques for Text-to Speech Synthesis Using Diphones," Speech Communications, vol. 9, 1990, pp. 453-467, 1990.

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