Patent ID: 8655670
Filing Date: 2014-02-18
Classification: G10L

Abstract:
1. An audio decoder for decoding an encoded multi-channel audio signal, the encoded multi-channel audio signal comprising an encoded first combination signal generated based on a combination rule for combining a first channel audio signal and a second channel audio signal of a multi-channel audio signal, an encoded prediction residual signal and prediction information, comprising: a signal decoder for decoding the encoded first combination signal to acquire a decoded first combination signal, and for decoding the encoded residual signal to acquire a decoded residual signal; and a decoder calculator for calculating a decoded multi-channel signal comprising a decoded first channel signal, and a decoded second channel signal using the decoded residual signal, the prediction information and the decoded first combination signal, so that the decoded first channel signal and the decoded second channel signal are at least approximations of the first channel signal and the second channel signal of the multi-channel signal, wherein the prediction information comprises a real-valued portion different from zero and/or an imaginary portion different from zero, wherein the prediction information comprises an imaginary factor different from zero, wherein the decoder calculator comprises a predictor configured for estimating an imaginary part of the decoded first combination signal using a real part of the decoded first combination signal, wherein the predictor is configured for multiplying the imaginary part of the decoded first combination signal by the imaginary factor of the prediction information when acquiring a prediction signal; wherein the decoder calculator further comprises a combination signal calculator configured for linearly combining the prediction signal and the decoded residual signal to acquire a second combination signal; and wherein the decoder calculator further comprises a combiner for combining the second combination signal and the decoded first combination signal to acquire the decoded first channel signal, and the decoded second channel signal, wherein at least one of the signal decoder, the predictor, the combination signal calculator, the combiner, and the decoder calculator comprises a hardware implementation.