Wideband speech decoding apparatus for producing excitation signal, synthesis filter, lower-band speech signal, and higher-band speech signal, and for decoding coded narrowband speech

摘要

A wideband speech decoding apparatus has means for producing an excitation signal from coded data, means for producing a synthesis filter, and means for decoding a speech signal from the excitation signal and the synthesis filter. The wideband speech decoding apparatus comprises acquisition means for acquiring identification information which identifies the speech signal to be decoded is narrowband. The wideband speech decoding apparatus further comprises control means for controlling decoding means based on the identification information.