of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other

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Systems employing more than two channels, e.g. quadraphonic (H04S5/00, H04S7/00 take precedence) > of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other