Patent ID: 8135136

Claim:
A device for enhancing an audio signal comprising a first channel (L) and a second channel (R), the audio signal having inter-channel properties which may be represented by parameters of source angle (α), inter-channel level difference (ILD), and inter-channel coherence (ICC), the device comprising: parameter adjustment means for adjusting an original parameter (α, ILD, ICC) so as to produce an adjusted parameter (α′, ILD′, ICC′) representing an adjusted inter-channel property, and processing means, responsive to (a) both (a)(i) the original parameter and (a)(ii) the adjusted parameter together, for processing the audio signal to produce an enhanced audio signal having the adjusted inter-channel property, wherein (b) the processing means (b)(i) uses the audio signal and the original parameter to determine a dominant signal Y[k] and a residual signal Q[k] and (b)(ii) inversely rotates the dominant signal Y[k] and the residual signal Q[k] over the adjusted parameter to produce an adjusted output signal corresponding to the enhanced audio signal.