AUDIO SIGNAL ENCODER, AUDIO SIGNAL DECODER, AND METHOD FOR ENCODING AND DECODING AUDIO SIGNAL

摘要

An audio signal encoder and an audio signal decoder which can reproduce audio signals even when the decoder does not make full use of information from the encoder. A quantizing section constituting the encoder (1) is constituted to have a first quantizing subsection (501) composed of low-, intermediate-, and high-band quantizing subsections, a second quantizing subsection (502) which further quantizes the quantizing error of the first quantizing subsection (501), and a third quantizing subsection (503) which furthermore quantizes the quantizing errors after the processing in the first and the second quantizing subsections (501, 502).