SPEECH COMPRESSION AND DECOMPRESSION APPARATUSES AND METHODS HAVING SCALABLE BANDWIDTH STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide speech compression and decompression apparatuses and methods having scalable bandwidth structure. SOLUTION: A band-transform unit 102 transforms a wideband speech signal to a narrowband low-band speech signal. A narrowband speech compressor 106 compresses the narrowband low-band speech signal and outputs a result of the compressing as a low-band speech packet. A decompression unit 108, 110 decompresses the low-band speech packet and obtains a decompressed wideband low-band speech signal. An error detection unit 114 detects an error signal that corresponds to a difference between the wideband speech signal and the decompressed wideband low-band speech signal. A high-band speech compression unit 116 compresses the error signal and a high-band speech signal of the wideband speech signal and outputs the result of the compressing as a high-band speech packet. COPYRIGHT: (C)2011,JPO&INPIT