Patent ID: 9578438
Date: 2017-02-21
CPC Classifications: H04R,H04S

Claim:
1. An apparatus for driving loudspeakers of a sound system in a vehicle, the sound system comprising at least two loudspeakers of a basic system, and a plurality of loudspeakers of a focus system, wherein each of the loudspeakers of the basic system and of the focus system has a position in an environment, and wherein the apparatus comprises: a basic channel provider for providing basic system audio channels (BSAC) for driving the loudspeakers of the basic system, a focused source renderer for providing focus system audio channels (FSAC) to drive the loudspeakers of the focus system, wherein the focused source renderer is configured to calculate a plurality of filter values for the loudspeakers of the focus system based on the positions of the loudspeakers of the focus system and based on a position of a focus point, wherein the focused source renderer is configured to generate at least three focus group audio channels (FGAC, FGAC- wherein the focus audio base signal (FABS) only comprises first frequency portions of an audio effect signal (AES), wherein the first frequency portions only have frequencies which are higher than a first predetermined frequency value, and wherein at least some of the first frequency portions have frequencies which are higher than a second predetermined frequency value, wherein the second predetermined frequency value is higher than or equal to the first predetermined frequency value, wherein the focused source renderer is configured to generate the at least three focus group audio channels (FGAC, FGAC-