Speech coding system and method including spectral quantizer

Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission

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704206, 704229, G10L 1906

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active

060946296

ABSTRACT:
A speech coding system and associated method relies on a speech encoder and a speech decoder. The encoder includes a spectral quantizer for computing line spectral frequencies (LSFs) for respective frames of speech and for quantizing the LSFs to obtain a minimum bit representation of a spectral envelope of each respective frame of speech. For even numbered frames of speech the LSFs are quantized using a vector quantization technique. For odd numbered frames of speech samples the LSFs are quantized using a dynamic bit allocation (DBA) method. The dynamic bit allocation method determines an interpolation factor for interpolating between the LSFs of the previous and next frames. According to the dynamic bit allocation method the most perceptually important LSFs are represented by relatively more bits, while the least perceptually important LSFs are represented by relatively fewer bits. The system and associated method thereby reduces an overall bit rate required to represent, transmit or store the speech samples.

REFERENCES:
patent: 5255339 (1993-10-01), Fette et al.
patent: 5271089 (1993-12-01), Ozawa
patent: 5642465 (1997-06-01), Scott et al.
patent: 5826221 (1998-10-01), Aoyagi
"Digital Processing of Speech Signals," LR Rabiner, RW Schafer, 1978, pp. 411-412.
"A Fixed-Point Computation of Partial Correlation Coefficients," J. LeRoux, C. Guegen, IEEE Transactions on ASSP, 1977, vol. 25, pp. 257-259.
"Improving Performance of Multi-Pulse LPC Coders at Low Bit Rates," S. Isinghas, B. Atal, IEEE ICASSP, May 1984, pp. 1.3.1-1.3.4.
"Line Spectrum Representation of Linear Predictive Coefficients of Speech Signals," J. Acoustic Society of America, 1975, vol. 57, p. 353.
"Efficient Vector Quantization of LPC Parameters at 24 Bits/frame," KK Paliwal, S Atal, IEEE Transactions on Speech and Audio Processing, Jan. 1993, vol. TSAP-1, pp. 661-664.
"Inmarsat-M System Definition Manual: Appendix I: Voice Coding System," Digital Voice Systems, Inc. Aug. 1991.
"The Sinusoidal Trasform Coder at 2400b/s," RJ McAulay, TF Quaieri, IEEE ICASSP, 15.6.1-15.6.3.
"High-Quality Harmonic Coding at Very Low Bit Rates," G. Yang, H. Leich, IEEE ICASSP, 1994, pp. I-181-I-184.

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