Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1998-07-13
2000-07-25
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704206, 704229, G10L 1906
Patent
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.
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Brooksby Glen William
Grabb Mark Lewis
Koch Steven Robert
Zinser, Jr. Richard Louis
Hudspeth David R.
Johnson C.
Lockheed Martin Corp.
Meise W.
Smits Talivaldis Ivars
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