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

摘要

A normalized-value calculator (12) calculates a normalized value which is a representative value of a specific number of samples that have been input. A normalized-value quantizer (13) obtains a quantized normalized value, which is produced by quantizing the normalized value, and a normalized-value quantization index which corresponds to the quantized normalized value. A quantization target calculator (14) calculates a subtraction value which is produced by subtracting the value corresponding to the quantized normalized value from a value corresponding to the magnitude of each sample value. If the subtraction value is positive and each sample value is positive, the quantization target calculator (14) sets the subtraction value as the quantization target value corresponding to each sample. If the subtraction value is positive and each sample value is negative, the quantization target calculator (14) sets a value produced by inverting the sign of the subtraction value as the quantization target value corresponding to each sample. If the subtraction value is not positive, the quantization target calculator (14) sets the quantization target value corresponding to each sample to zero. A vector quantizer (15) collects and vector quantizes the plurality of quantization target values corresponding to the plurality of samples.