Method for deriving at least three audio signals from two input audio signals

Abstract From the Canadian patent

Various equivalent adaptive audio matrix arrangements are disclosed each of , which includes a feedback-derived control system that automatically causes the cancellation of undesired matrix crosstalk components in the matrix output. Each adaptive audio matrix arrangement includes a passive matrix that produces a pair of passive matrix signals in response to two input signals. A feedbackderived control system operates on each pair of passive matrix signals urging , the magnitudes of pairs of intermediate signals toward equality. Each control system includes variable gain elements and a feedback and comparison arrangement generating a pair of control signals for controlling the variable …