| 摘要 |
PROBLEM TO BE SOLVED: To suppress a delay or an increased computing amount when decoding when an audio signal, if a multi-channel audio signal is down-mixed and encoded.SOLUTION: An inverse multiplexing unit 101 obtains encoded data multiplexed by a BC parameter. A non-correlated frequency and time conversion unit 102 IMDCT-transforms and IMDST-transforms a frequency spectral coefficient of a monaural signal Xobtained from the encoded data to generate a monaural signal Xthat is a time-region signal, and a signal X' that is substantially non-correlated to that monaural signal X. A stereo-synthesizing unit 103 generates a stereo signal by synthesizing the monaural signal Xand signal X' using the BC parameter. This can be applied, for example, to an audio-processing device that decodes down-mixed and encoded stereo signals. |
