Patent ID: 6233562
Filing Date: 2001-05-15
Classification: H04B,H04H

Abstract:
An audio decoding device for decoding audio signals for n channels, where n>1, by sub-band synthesis operation using sub-band synthesis filter data and sub-band signal data, the audio decoding device comprising:a first memory section for retaining the sub-band synthesis filter data and the sub-band signal data for m channels used for the sub-band synthesis operation, where m<n;a second memory section for retaining the sub-band signal data and the sub-band synthesis data for n channels;an operation section for receiving coded audio data and decoding the coded audio data into sub-band data, performing the sub-band synthesis filter operation using the data retained in the first memory section and outputting the decoded audio data for m channels, calculating new sub-band synthesis filter data calculated by the sub-band synthesis filter operation, and requesting replacement of the new sub-band synthesis filter data and sub-band synthesis filter data subsequently required; anda data transfer section for, upon request from the operation section, replacing the sub-band synthesis filter data and the sub-band signal data in the first and second memory section by a unit of m channels.