Patent ID: 8077815

Claim:
A system to process a multi-channel digital audio signal, the system including: a graphical user interface to receive input from a user identifying a frequency band; a controller that receives the user input identifying the frequency band and to control processing of the multi-channel digital audio signal with regard to the frequency band by a plurality of functional units; and the plurality of functional units coupled to the controller, the plurality of functional units including: a digital phase detector to determine, for the frequency band, a phase difference between first and second channel signals of the multi-channel digital audio signal; an amplitude detector to determine, for the frequency band, an amplitude difference between the first and second channel signals of the multi-channel digital audio signal; and a digital attenuator (i) to calculate an attenuation factor based on a magnitude of at least one of the phase and amplitude differences, and (ii) to attenuate an amplitude of the frequency band of the multi-channel digital audio signal in accordance with the attenuation factor if the phase difference exceeds a first predetermined threshold or the amplitude difference exceeds a second predetermined threshold.