Low bit-rate coding of unvoiced segments of speech

Details Low bit-rate coding of unvoiced segments of speech Low bit-rate coding of unvoiced segments of speech

2006-12-05

2006-12-05

McFadden, Susan (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

07146310

ABSTRACT:
A low-bit-rate coding technique for unvoiced segments of speech includes the steps of extracting high-time-resolution energy coefficients from a frame of speech, quantizing the energy coefficients, generating a high-time-resolution energy envelope from the quantized energy coefficients, and reconstituting a residue signal by shaping a randomly generated noise vector with quantized values of the energy envelope. The energy envelope may be generated with a linear interpolation technique. A post-processing measure may be obtained and compared with a predefined threshold to determine whether the coding algorithm is performing adequately.

REFERENCES:
patent: 6463407 (2002-10-01), Das et al.
patent: 6820052 (2004-11-01), Das et al.

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