Coding device, coding method, decoding device, decoding method, and storage medium

摘要

For respective sampling data of waveform data of sounds to be coded, a prediction residual value is calculated as sampling residual data, and an effective bit length is calculated from this residual waveform data. Then, for the effective bit length data, a maximum effective bit length among processing targets is generated as common effective actual data, and coded data in which this common effective actual data and information indicating the common effective bit length are arranged in a predetermined configuration format are generated. The information included in the coded data is analyzed and each of the plurality of the common effective bit information is extracted. Then, waveform data of the sounds are decoded by performing inverse linear prediction processing from an analysis result on the residual waveform data decompressed by performing bit extension which adds a portion other than the common effective bit length.

主权项

1. A coding device, comprising:
a sampling residual data generator comprising a delay circuit for delaying sampling data inputted among PCM waveform of sound data, and a multiplier for multiplying the delayed sampling data by a linear prediction coefficient, the sampling residual data generator generating sampling residual data by subtracting the data multiplied by the multiplier from the inputted sampling data; an effective bit length data generator for calculating an effective bit length for the sampling residual data, and generating effective bit length data indicating the effective bit length of the sampling residual data; a common effective bit length retrieving unit for retrieving a maximum effective bit length as a common effective bit length, with each effective bit length of a predetermined number of sets of the sampling residual data as a processing target, for the effective bit length data generated by the effective bit length data generator, and generating, as a predetermined number of common effective actual data, data in which a portion other than the common effective bit length is erased from each of the predetermined number of sets of the sampling residual data; and a configuration format arranger for generating, as coded data, data in which the predetermined number of common effective actual data generated by the common effective bit length retrieving unit and information indicating the common effective bit length are at least arranged in a predetermined configuration format.