You read in creation manner of the significance codebook and configuration manner of initial value of MA prediction coefficient when studying in codebook facilities timing and coded manner and its decoding manner of the sound signaling and the computer where the encoding program is stored you read in possible storage and the computer where the decoding program is stored, possible storage

摘要

To make suppressible deterioration in the sound quality of a relatively-low-sound- pressure part of a decoded sound signal by setting respective elements of a weight code book by using a distance scale determined by taking human sound pressure sense characteristics into account and encoding a sound signal by using the weight code book which is thus generated. SOLUTION: In order to calculate the distortion (d) of a reproduced sound candidate (y) while taking auditory weighting into consideration and a distortion calculation part 1-6 inputs the reproduced sound candidate (d) outputted from a composing filter after passing it through an auditory weighting filter 2-2 and also inputs an input sound (x) to the distance calculation part 2-4 after passing it through an auditory weighting filter 2-3. The auditory weighting filter 2-2 has a linear prediction parameter (a) as a coefficient and converts the reproduced sound candidate (y) into a reproduced sound candidate yw with auditory weight and outputs it to the distance calculation part 2-4. The auditory weighting filter 2-3 is a filter which uses a fixed coefficient and converts an input sound (x) into an input sound xw with auditory weight and outputs it to the distance calculation part 2-4.