Patent ID: 9088854
Filing Date: 2015-07-21
Classification: H04S

Abstract:
1. An acoustic control apparatus, comprising: a control filter configured to multiply a first acoustic signal by a control filter coefficient to obtain a second acoustic signal; a first loudspeaker configured to emit the second acoustic signal; and a second loudspeaker configured to emit the first acoustic signal, wherein the control filter coefficient is calculated based on first head-related transfer function sets from the first loudspeaker and the second loudspeaker to target binaural positions and second head-related transfer function sets from a target virtual acoustic source to the target binaural positions in such a manner that a second spatial average of complex sound pressure ratios at the target binaural positions when the first loudspeaker and the second loudspeaker emit the second acoustic signal and the first acoustic signal is approximated to a first spatial average of complex sound pressure ratios at the target binaural positions if the target virtual acoustic source emitted the first acoustic signal, the target virtual acoustic source being different from the first loudspeaker and the second loudspeaker.