Apparatus and method of encoding and decoding signals

摘要

A method of encoding an audio signal, where signals including two or more channel signals are downmixed to a mono signal, the mono signal is divided into a low-frequency signal and a high-frequency signal, the low-frequency signal is encoded through algebraic code excited linear prediction (ACELP) or transform coded excitation (TCX), and the high-frequency signal is encoded using the low-frequency signal. A method of decoding of an audio signal, a low-frequency signal encoded through ACELP or TCX is decoded, a high-frequency signal is decoded using the low-frequency signal, the low-frequency signal and the high-frequency signal are combined to generate a mono signal, and the mono signal is upmixed by decoding spatial parameters regarding signals including two or more channel signals.

主权项

1. A method of decoding a signal, the method comprising:
decoding an encoded signal, by using either a first mode or a second mode; generating a high band signal by using the decoded signal; and upmixing a down-mixed mono signal including the decoded signal and the generated high band signal to a stereo signal, by using one or more spatial parameters, wherein the upmixing is performed by using the one or more spatial parameters generated based on a bitrate mode.