Patent ID: 9602944
Date: 2017-03-21
CPC Classifications: H04R,H04S

Claim:
1. An apparatus for driving loudspeakers of a sound system, the sound system comprising at least four loudspeakers of a surround system, and at least three loudspeakers of a focus system, wherein each of the loudspeakers of the surround system and of the focus system has a position in an environment, and wherein the apparatus comprises: a surround channel provider for providing surround system audio channels to drive the loudspeakers of the surround system, a focused source renderer for providing focus system audio channels to drive the loudspeakers of the focus system, wherein the focused source renderer is configured to calculate a plurality of delay 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 for at least some of the loudspeakers of the focus system based on the plurality of delay values and based on a focus audio base signal to provide the focus system audio channels, so that an audio output produced by the loudspeakers of the focus system, when being driven by the focus system audio channels, allows localizing the position of the focus point by a listener in the environment, wherein the focus audio base signal only comprises first frequency portions of an audio effect signal, 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 based on the focus audio base signal such that the focus group audio channels only have frequencies which are higher than a predetermined frequency value, and wherein the surround channel provider is configured to generate the surround system audio channels based on a secondary effect signal, wherein the secondary effect signal only comprises second frequency portions of the audio effect signal, wherein the second frequency portions only have frequencies which are lower than or equal to the second predetermined frequency value, and wherein at least some of the second frequency portions have frequencies which are lower than or equal to the first predetermined frequency value.