Patent ID: 7490044

Claim:
A method for processing two input audio channel signals to provide n output audio channel signals where n>2, comprising: dividing the first input channel signal and the second input channel signal into a plurality of corresponding non-bass frequency bands; measuring the amplitude of the audio signal in the two input channels in one of the frequency bands to provide a first channel first frequency band audio signal and a second channel first frequency band audio signal to provide a first channel first frequency band audio signal amplitude and a second channel first frequency band audio signal amplitude; determining the correlation between the first channel first frequency band audio signal and the second channel first frequency band audio signal to provide a first frequency band correlation; scaling the first channel first frequency band audio signal by a first factor (a(first)) related to the first frequency band correlation and further related to the first channel first frequency band audio signal amplitude and the second channel first frequency band audio signal amplitude, the scaling to provide a first scaled first output channel first frequency band audio signal first portion; scaling the second channel first frequency band audio signal by a second factor (a(second)) related to the first frequency band correlation and further related to the first channel first frequency band audio signal amplitude and the second channel first frequency band audio signal amplitude, the scaling to provide a first scaled first output channel first frequency band audio signal second portion; and combining the first scaled first channel first frequency band audio signal first portion and the first scaled first channel first frequency band audio signal second portion to provide a first frequency band portion of a center channel output audio signal.