Interpolation in a speech decoder of a transmission system on th

Details Interpolation in a speech decoder of a transmission system on th Interpolation in a speech decoder of a transmission system on th

1998-02-05

2000-12-05

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704265, G10L 1906

Patent

active

061579076

ABSTRACT:
A transmission system wherein a speech signal is represented by a plurality of prediction parameters updated once per frame. Each frame comprises a plurality of sub-frames in which an excitation signal generated by a fixed codebook and an adaptive codebook is updated. In order to enhance the reconstructed speech quality the prediction coefficients are interpolated at the decoder by an LPC coefficient interpolator to obtain interpolated prediction coefficients for each sub-frame. According to the present invention the interpolation of the prediction coefficients is not based on the prediction coefficients used for transmission, such as reflection coefficients or Log Area Ratios, but on Line Spectral Frequencies. This reduces degradation of speech quality due to interpolation.

REFERENCES:
patent: 4975956 (1990-12-01), Liu et al.
patent: 5557705 (1996-09-01), Taguchi
patent: 5664055 (1997-09-01), Kroon
patent: 5675701 (1997-10-01), Kleijn et al.
patent: 5737484 (1998-04-01), Ozawa
patent: 5826221 (1998-10-01), Aoyagi
patent: 5864796 (1999-01-01), Inoue et al.
By K.K. Paliwal et al, "Efficient Vector Quantization of LPC Parameters at 24 Bits/Frame" IEE Transactions on Speech and Audio Processing, vol. 1, No. 1, Jan. 1993, pp. 3-14.
GSM Recommendation 06.10, GSM Full Rate Speech Transcoding Published by European Telecommunication Standardisation Institute (ETSI) Jan. 1992.

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