| 摘要 |
A method and system for quantizing LSF vectors in a speech coder, wherein predicted LSF values based on previously decoded output values are used to estimate spectral distortion, along with the residual codebook vectors and t he LSF coefficients. The method comprises the steps of obtaining a plurality of quantized LSF coefficients from the respective predicted LSF values (28), an d the residual codebook vectors; rearranging the quantized LSF coefficients in the frequency domain in an orderly fashion (40); obtaining the spectral distortion from the rearranged quantized LSF coefficients and the respective LSF coefficients (42); and an optimal code vector is selected based on the spectral distortion (44).
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