METHOD AND DEVICE FOR CONTROLLING DIRECTIONALITY

摘要

Directivity control method and device which can emphasize or suppress sound deriving from an arbitrary direction with a little computation using two microphones closely disposed are provided. An interchange circuit 2 alternately interchanges a pair of input signals InL, InR for each one sample to generate a pair of interchanged signals InA, InB. A coefficient updating circuit 3 multiplies the one InB of the interchanged signals by a coefficient m to generate an error signal between the interchanged signals InA, InB. A recurrence formula of the coefficient m containing the error signal is calculated to update the coefficient m for each one sample. Subsequently, the pair of input signals InL, InR are multiplied by the sequentially updated coefficient m, and output.