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Sound field control in multiple listening regions

  • US 20100305725A1
  • Filed: 05/28/2009
  • Published: 12/02/2010
  • Est. Priority Date: 05/28/2009
  • Status: Active Grant
First Claim
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1. A method for determining an audio precompensation controller for an associated sound generating system, said sound generating system comprising a limited number N≧

  • 2 of loudspeaker inputs for emulating a number L≧

    1 of virtual sound sources, each virtual sound source having an input signal, said audio precompensation controller having said L input signals to the virtual sound sources as inputs and producing N signals as outputs, wherein said N outputs of said audio precompensation controller are used as input signals to the sound generating system, said audio precompensation controller having the property of producing output zero for some setting of its adjustable parameters, with said method comprising the steps of;

    estimating, for of each of said N loudspeaker input signals, an impulse response at each of a plurality M of measurement positions in a listening environment based on sound measurements at said M measurement positions, wherein said M measurement positions are distributed in at least two spatially disjoint listening regions, each listening region having at least four measurement positions, where said listening regions correspond to different human listening positions and the distance between regions is larger than the largest distance between adjacent measurement positions within any region;

    specifying a target impulse response for each of said L virtual sound sources at each of said M measurement positions in said spatially disjoint regions;

    determining adjustable filter parameters of said audio precompensation controller so that a criterion function is optimized under the constraint of stability of the dynamics of the audio precompensation controller, with said criterion function including a weighted summation of powers of differences between the compensated estimated impulse responses and the target impulse responses over a discrete grid of said M measurement positions.

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