Patent ID: 7260231

Claim:
A method for listening to simultaneous audio signals, the method comprising: receiving a first audio signal from a first source; adding only a first differentiation cue to the first audio signal to produce a first stereo signal having a right first audio signal and a left first audio signal; receiving a second audio signal from a second source; producing a second stereo signal having a right second audio signal and a left second audio signal from said second audio signal; providing the right first audio signal and right second audio signal to a right audio transducer; and providing the left first audio signal and the left second audio signal to a left audio transducer; wherein said first differentiation cue consists of an amplitude difference of at least 3 dB between the right first audio signal and the left first audio signal and provides differentiation to allow a listener to simultaneously hear and understand said first and second audio signals without degradation to the intelligibility of said signals; and wherein at least one of said sources does not have any capability to receive any of said stereo signals.