Parametric mixing of audio signals

Abstract

In an encoding section (), a downmix section () forms first and second channels (L, L) of a downmix signal as linear combinations of first and second groups () of channels, respectively, of an M-channel audio signal; and an analysis section () determines upmix parameters (α) for parametric reconstruction of the audio signal, and mixing parameters (α). In a decoding section (), a decorrelating section () outputs a decorrelated signal (D) based on the downmix signal; and a mixing section () determines mixing coefficients based on the mixing parameters or the upmix parameters, and forms a K-channel output signal ({tilde over (L)}, . . . , {tilde over (L)}) as a linear combination of the downmix signal and the decorrelated signal in accordance with the mixing coefficients. The channels of the output signal approximate linear combinations of K groups (--) of channels, respectively, of the audio signal. The K groups constitute a different partition of the audio signal than the first and second groups, and 2≤K<M.