Method for generating a spectral noise weighting filter for use

Details Method for generating a spectral noise weighting filter for use Method for generating a spectral noise weighting filter for use

1993-02-23

1995-07-18

Knepper, David D.

395 236, G10L 914

Patent

active

054349478

ABSTRACT:
An Rth-order filter models the frequency response of multiple filters, to provide a filter which offers the control of multiple filters without the complexity of multiple filters. The Rth-order filter can be used as a spectral noise weighting filter or a combination of a short-term predictor filter and a spectral noise weighting filter, referred to as the spectrally noise weighted synthesis filter, depending on which embodiment is employed. In general, the method models the frequency response of L Pth-order filters by a single Rth-order filter, where the order R<L.times.P. Thus, this method increases the control of a speech coder filter without a corresponding increase in the complexity of the speech coder.

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B. S. Atal, "Predictive Coding of Speech at Low Bit Rtes", IEEE Trans. on Comm., vol. COM-30, No. 4, pp. 600-614, Apr. 1982.
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A Low-Delay CELP Coder for the CCITT 16kb/s Speech Coding Standard, Juin-Hwey Chen, Senior Member, IEEE, Richard V. Cox, Fellow, IEEE, Yen-Chun Lin, Nikil Jayant, Fellow, IEEE, and Melvin J. Melchner, IEEE Journal on Selected Areas in Communications, vol. 10 No. 5, Jun., 1992, pp. 830-849.

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