METHOD AND APPARATUS FOR GENERATING AND RESTORING DOWNMIXED SIGNAL

摘要

An embodiment of the present invention provides a method for generating a downmixed signal, including: performing a time-frequency transform on a received left sound channel signal and a received right sound channel signal to obtain a frequency domain signal, and dividing the frequency domain signal into several frequency bands; calculating a sound channel energy ratio and a sound channel phase difference of each frequency band; calculating a phase difference between the downmixed signal and a first sound channel signal in each frequency band according to the sound channel energy ratio and the sound channel phase difference; and calculating a frequency domain downmixed signal according to the left sound channel signal, the right sound channel signal, and the phase difference between the downmixed signal and the first sound channel signal in each frequency band. This method effectively improves quality of stereo encoding and decoding.

主权项

1. A method for generating a downmixed signal, the method comprising:
performing a time-frequency transform on a left sound channel signal and a right sound channel signal to obtain a frequency domain signal, and dividing the frequency domain signal into several frequency bands; calculating a sound channel energy ratio and a sound channel phase difference of each frequency band, wherein the sound channel energy ratio reflects energy ratio information of the left sound channel signal and the right sound channel signal in each frequency band, and the sound channel phase difference reflects phase difference information of the left sound channel signal and the right sound channel signal in each frequency band; calculating a phase difference between the downmixed signal and a first sound channel signal in each frequency band according to the sound channel energy ratio and the sound channel phase difference, wherein the first sound channel signal is the left sound channel signal or the right sound channel signal; and calculating a frequency domain downmixed signal according to the left sound channel signal, the right sound channel signal, and the phase difference between the downmixed signal and the first sound channel signal in each frequency band.