Patent ID: 8724734

Claim:
A coding method, implemented by a coding apparatus, comprising: a normalization step of normalizing, by a normalizer of the coding apparatus, an input signal in each frame containing a plurality of samples, with a normalization value corresponding to the input signal and calculated from the input signal in the frame to generate a normalized input signal sequence; a signal quantization step of quantizing, by a signal quantizer of the coding apparatus, the normalized input signal sequence to generate and output a signal quantization index; a correction coefficient generation step of generating, by a correction coefficient generator of the coding apparatus, a correction coefficient that minimizes a distance measure between an input signal sequence and a signal sequence obtained by inverse normalizing a signal sequence corresponding to the signal quantization index with the normalization value corrected with the correction coefficient; and a normalization information quantization step of generating and outputting, by a normalization information quantizer of the coding apparatus, a normalization information quantization index by quantizing the correction coefficient and the normalization value or the normalization value corrected with the correction coefficient.