SOUND CODING DEVICE AND SOUND CODING METHOD

摘要

A sound coding device having a monaural/stereo scalable structure and capable of efficiently coding stereo sound even when the correlation between the channel signals of a stereo signal is small. In a core layer coding block (110) of this device, a monaural signal generating section (111) generates a monaural signal from first and second-channel sound signal, a monaural signal coding section (112) codes the monaural signal, and a monaural signal decoding section (113) greatest a monaural decoded signal from monaural signal coded data and outputs it to an expansion layer coding block (120). In the expansion layer coding block (120), a first-channel prediction signal synthesizing section (122) synthesizes a first-channel prediction signal from the monaural decoded signal and a first-channel prediction filter digitizing parameter and a second-channel prediction signal synthesizing section (126) synthesizes a second-channel prediction signal from the monaural decoded signal and second-channel prediction filter digitizing parameter.