Method and apparatus for encoding/decoding stereo audio

摘要

Provided are a method and apparatus for encoding/decoding stereo audio. In the method for encoding stereo audio, stereo audio is encoded based on at least one of the phase difference between first and second channel audios and information on an angle made by a vector on the intensity of mono-audio and a vector on the intensity of the first channel audio or a vector on the intensity of the second channel audio. Thus, the number of encoded parameters is minimized so that a compression ratio in the encoding of the stereo audio is improved.

主权项

1. A method of decoding stereo audio, the method comprising:
restoring mono-audio by decoding audio data on the stereo audio; extracting information for determining intensities of first and second channel audios and information on a phase difference between the first and second channel audios in a predetermined frequency band by decoding the audio data; and restoring the stereo audio in the frequency band based on the restored mono-audio and the extracted information, wherein the mono-audio is generated by adding the first channel audio and a phase-adjusted second channel audio whose phase is adjusted to be the same as a phase of the first channel audio, and a phase of the mono-audio is same as the phase of the first channel audio and a phase of the phase-adjusted second channel audio, and wherein the information for determining the intensities of the first and second channel audios is information on an angle between a first vector on the intensity of the first channel audio in the frequency band and a third vector on an intensity of the mono-audio or an angle between a second vector on the intensity of the second channel audio in the frequency band and the third vector in a vector space in which the first vector and the second vector make a predetermined angle.