Patent ID: 6606592
Filing Date: 2003-08-12
Classification: G10L

Abstract:
A variable dimension spectral magnitude quantization apparatus according to linear prediction spectral envelope and residual spectral envelope quantization using low order linear prediction modeling and residual spectrum modeling, the apparatus comprising:a predictive quantizer for obtaining a predictive-quantized first residual spectral envelope from a quantized previous residual spectral envelope; a mel-scale binary vector quantizer for obtaining a second residual spectral envelope represented with a linear scale code vector using a mel-scale binary vector codebook; a synthesized spectral envelope generator for adding the output of the predictive quantizer and the output of the mel-scale binary vector quantizer to generate a quantized residual spectral envelope and multiplying the quantized residual spectral envelope by a corresponding quantized linear prediction spectral envelope to generate a synthesized spectral envelope; a comparator for comparing the synthesized spectral envelope with an original spectral envelope; and a minimum value detector for detecting a minimum value from the values sequentially obtained by the comparator.