Method for reconstructing an acoustic field
First Claim
1. A method of reconstructing a sound field at at least one target location, the sound field being generated by at least one sound source, the method comprising:
- receiving, at an interface circuit, one or more measured values of a first acoustic quantity measured at a set of measurement locations;
defining, by a computer, a set of virtual source locations and a set of wave functions each representative of a respective sound field originating from a respective one of the defined set of virtual source locations;
wherein the defining comprises (a) defining a respective scaling surface for each of the defined virtual source locations, the scaling surface being located outside a first source-free region, and (b) scaling each of the set of wave functions to each have a predetermined amplitude on the scaling surface associated with the virtual source location;
computing, by the computer, a second acoustic quantity for at least one target location from a superposition of the set of scaled wave functions multiplied by respective expansion coefficients, the measurement locations and the at least one target location being located in the first source-free region, and the virtual source locations being located outside the first source-free region; and
storing the second acoustic quantity in a memory.
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Accused Products
Abstract
Disclosed herein is a method of reconstructing a sound field. The method comprises receiving measured values indicative of a first acoustic quantity measured at a set of measurement locations; defining a set of virtual source locations; and computing a second acoustic quantity for at least one target location from one or more wave functions each representative of a respective sound field originating from a respective one of the defined set of virtual source locations; wherein the one or more wave functions are weighted by respective one or more weighting factors, and wherein computing comprises determining the one or more weighting factors from a least-norm fit of the one or more wave functions to the received measured values.
9 Citations
18 Claims
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1. A method of reconstructing a sound field at at least one target location, the sound field being generated by at least one sound source, the method comprising:
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receiving, at an interface circuit, one or more measured values of a first acoustic quantity measured at a set of measurement locations; defining, by a computer, a set of virtual source locations and a set of wave functions each representative of a respective sound field originating from a respective one of the defined set of virtual source locations; wherein the defining comprises (a) defining a respective scaling surface for each of the defined virtual source locations, the scaling surface being located outside a first source-free region, and (b) scaling each of the set of wave functions to each have a predetermined amplitude on the scaling surface associated with the virtual source location; computing, by the computer, a second acoustic quantity for at least one target location from a superposition of the set of scaled wave functions multiplied by respective expansion coefficients, the measurement locations and the at least one target location being located in the first source-free region, and the virtual source locations being located outside the first source-free region; and storing the second acoustic quantity in a memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16, 17, 18)
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13. A processing apparatus for reconstructing a sound field at at least one target location, the sound field being generated by at least one sound source, the processing apparatus comprising:
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an interface for receiving measured values of a first acoustic quantity measured at a set of measurement locations; and a processing unit configured to; define a set of virtual source locations and a set of wave functions each representative of a respective sound field originating from a respective one of the defined set of virtual source locations; for each of the defined virtual source locations, define a respective scaling surface located outside a first source-free region; scale each of the set of wave functions to each have a predetermined amplitude on the scaling surface associated with the virtual source location; and compute a second acoustic quantity for at least one target location from a superposition of the set of scaled wave functions multiplied by respective expansion coefficients, the measurement locations and the at least one target location being located in the first source-free region, and the virtual source locations being located outside the first source-free region. - View Dependent Claims (14, 15)
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Specification