Audio signal enhancement
AssigneeKoninklijke Philips Electronics N.V.
InventorsMachiel Willem Van Loon, Dirk Jeroen Breebaart
Life of this patent
Estimating the term…
Abstract
A device (10) for enhancing a multi-channel (e.g. stereo) audio signal has a parameter adjustment unit (13) for adjusting an original parameter (α, ILD, ICC) which represents an original inter-channel property of the audio signal. The device further comprises a processing unit (11) for processing the audio signal so as to produce an enhanced audio signal having the adjusted parameter (α′, ILD′, ICC′). The device allows stereo widening or other multi-channel signal enhancements without introducing artifacts.
Claims28
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.
A method of 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 method comprising the steps of:
- 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 the audio signal, responsive to (a) both (a)(i) the original parameter and (a)(ii) the adjusted parameter together, to produce an enhanced audio signal having the adjusted inter-channel property, wherein (b) processing comprises (b)(i) using the audio signal and the original parameter to determine a dominant signal Y[k] and a residual signal Q[k] and (b)(ii) inversely rotating 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.
Dependencies are inferred from the claim text.