Sound field control in multiple listening regions
First Claim
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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Abstract
A scheme to design an audio precompensation controller for a multichannel audio system, with a prescribed number N of loudspeakers in prescribed positions so that listeners positioned in any of P>1 spatially extended listening regions should be given the illusion of being in another acoustic environment that has L sound sources located at prescribed positions in a prescribed room acoustics. The method provides a unified joint solution to the problems of equalizer design, crossover design, delay and level calibration, sum-response optimization and up-mixing. A multi-input multi-output audio precompensation controller is designed for an associated sound generating system including a limited number of loudspeaker inputs for emulating a number of virtual sound sources. Method includes: estimating, for each loudspeaker input signals, an impulse response at each of a set of measurement positions that cover the P listening regions; specifying a target impulse response (target stages) for each virtual sound source at each measurement position; and determining adjustable filter parameters of the audio precompensation controller so that a criterion function is optimized.
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Citations
20 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16, 17, 18, 19, 20)
- 2 of loudspeaker inputs for emulating a number L≧
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13. A system 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 system comprising;means for 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 regions, each 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; means for 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; means for 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. - View Dependent Claims (14)
- 2 of loudspeaker inputs for emulating a number L≧
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15. A computer program product for determining, when running on a computer system, 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 computer program product comprising;program means for 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 regions, each 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; program means for 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; program means for 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.
- 2 of loudspeaker inputs for emulating a number L≧
Specification