IMPROVED stereo coding on the basis of a combination adaptively selects left / right or middle / secondary STEREO CODING AND OF PARAMETRIC STEREO CODING

摘要

FIELD: physics, acoustics.;SUBSTANCE: invention relates to means of encoding and decoding audio signals. A downmix signal and a residual signal are generated based on a stereo signal. The difference in intensity between channels and cross-correlation between channels are determined. Preferably, parametric stereo coding parameters are time- and frequency-dependent. A transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding can be selected. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-dependent.;EFFECT: high quality of signal encoding.;66 cl, 26 dwg