METHOD AND APPARATUS FOR ENCODING AND DECODING SIGNAL

摘要

A method and an apparatus for encoding and decoding a signal are provided to encode or decode signals comprised of at least two channels by a parametric stereo method and a parametric multi-channel method, thereby efficiently decoding a stereo signal or a multi channel signal. A mono signal is generated by down-mixing signals of two input channels(1310). The mono signal is processed by a pre-processing/analysis filter bank. The generated mono signal is divided to a low-frequency signal and a high-frequency signal. The generated low-frequency signal is encoded by one of ACELP(Algebraic Code Excited Linear Prediction) encoding or TCX(Transform coded excitation) encoding about each frame(1330). The generated high-frequency signal is encoded(1340).