Sensitivity weighted vector quantization of line spectral pair frequencies
AssigneeQUALCOMM Incorporated
InventorWilliam R. Gardner
Life of this patent
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Abstract
A novel and improved method and apparatus for quantizing the line spectral pair (LSP) frequencies in a speech compression system is disclosed. A novel and computationally efficient procedure for determining the set of quantization sensitivities for the LSP frequencies is disclosed, which results in a computationally efficient error measure for use in vector quantization of the LSP frequencies. A novel method of weighting the quantization error is disclosed, which accumulates the quantization error in each LSP frequency and weights that error by the sensitivity of that LSP frequency.
Claims33
An apparatus for efficient determination of LSP quantization sensitivities using closed form analysis, comprising:
- polynomial division means for receiving a set of line spectral pair (LSP) frequencies and a set of linear prediction coding (LPC) coefficients and for generating a set of quotient coefficients in accordance with a predetermined polynomial division format;
- and
- sensitivity cross correlation means for receiving said set of quotient coefficients and a set of speech auto correlation coefficients and for computing a set of LSP sensitivity coefficients in accordance with a weighted cross-correlation computation format.
An apparatus for quantizing line spectral pair (LSP) frequencies comprising:
- line spectral pair (LSP) sensitivity generation means for receiving a set of line spectral pair (LSP) frequencies, a set of linear prediction coding (LPC) coefficients, and for efficiently computing a set of LSP sensitivity coefficients in accordance with a weighted cross-correlation closed form computation format;
- and
- quantization means for receiving said set of LSP frequencies and said set of LSP sensitivity coefficients and for selecting a set of quantized LSP frequencies in accordance with a sensitivity weighted error computation format.
An apparatus for quantizing line spectral pair (LSP) frequencies comprising:
- LSP sensitivity generator that receives a set of line spectral pair (LSP) frequencies, a set of linear prediction coding (LPC) coefficients, and for computing a set of LSP sensitivity coefficients in accordance with a weighted cross-correlation computation format;
- and
- LSP quantizer for receiving said set of LSP frequencies and said set of LSP sensitivity coefficients and for selecting a set of quantized LSP frequencies in accordance with a sensitivity weighted error computation format.
A method for efficient determination of LSP quantization sensitivities using closed form analysis, comprising the steps of:
- receiving a set of line spectral pair (LSP) frequencies and a set of linear prediction coding (LPC) coefficients;
- generating a set of quotient coefficients in accordance with a predetermined polynomial division format;
- and
- computing a set of LSP sensitivity coefficients in accordance with a weighted cross-correlation computation format.
A method for quantizing line spectral pair (LSP) frequencies, comprising the steps of:
- receiving a set of line spectral pair (LSP) frequencies and a set of linear prediction coding (LPC) coefficients;
- generating a set of quotient coefficients in accordance with a predetermined polynomial division format;
- computing a set of LSP sensitivity coefficients in accordance with a weighted cross-correlation closed form computation format;
- and
- selecting a set of quantized LSP frequencies in accordance with a sensitivity weighted error computation format.
Dependencies are inferred from the claim text.