High efficiency encoding method

摘要

A high efficiency encoding method comprising the steps of: finding (712c) data on frequency axis as an M-dimensional vector on the basis of data obtained by dividing (712a) an input audio signal on block-by-block basis and converting (712b) the signal onto the frequency axis; and performing quantization (715), by using a vector quantizer having plural codebooks according to a state of the audio signal for processing the data on the frequency axis of the M-dimensional vector with vector quantization, and by changing over the plural codebooks in accordance with a parameter indicating characteristics of each block of the input audio signal.