ENCODING METHOD, DECODING METHOD, DEVICE, PROGRAM, AND RECORDING MEDIUM

摘要

An encoding method obtains a quantized normalized value by quantizing a normalized value, said normalized value being a value representing samples, and a normalized value quantization index corresponding to the quantized normalized value. If a subtraction value calculated by subtracting a value corresponding to the quantised normalised value from a value corresponding to the size of the value of each sample is positive, and the value of each sample is positive, the subtraction value is selected as a quantisation target value. If the subtraction value is positive and the value of each sample is negative, the sign of the subtraction value is inverted before being selected as the quantisation target value. A plurality of quantisation target values respectively corresponding to a plurality of samples are gathered and vector quantized, and a vector quantization index is output. Sign information is output showing the sign of each sample from the abovementioned samples in which the subtraction value is not to be made positive. Thus provided is an encoding and decoding technique for reducing musical noise and the like.