Speech playback speed change using wavelet coding, preferably su

Details Speech playback speed change using wavelet coding, preferably su Speech playback speed change using wavelet coding, preferably su

1997-11-28

1999-12-28

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704211, 704500, G10L 302, G10L 704

Patent

active

060093862

ABSTRACT:
A method of speeding up playback of a digitized audio signal without raising the pitch and without introducing discontinuities in the speech signal, comprises sub-band coding (SBC) consecutive blocks of the audio signal with standard SBC or wavelet compression to derive frames of data. Next periodic adjacent pairs of the frames are dropped to leave a stream of remaining frames. A sped up approximation of the digitized audio signal is then reconstructed by sub-band decoding consecutive remaining frames. The method can also be used to slow speech playback by replicating, rather than dropping, adjacent pairs of frames.

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"Sub-Band Coding" by R.E. Crochiere, published in the Bell System Technical Journal, vol. 60, No. 7, Sep. 1981, pp. 1633 to 1651.

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