METHOD FOR RECONSTRUCTING AN ACOUSTIC FIELD
First Claim
1. A method of reconstructing a sound field at least one target location, the method comprising:
- receiving one or more measured values of a first acoustic quantity measured at a set of measurement locations;
defining 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;
computing a second acoustic quantity for at least one target location from a superposition of the set of wave functions multiplied by respective expansion coefficients;
wherein the computing comprises determining the expansion coefficients from a least-norm fit of the superposition of the set of wave functions to the received measured values.
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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.
14 Citations
21 Claims
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1. A method of reconstructing a sound field at least one target location, the method comprising:
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receiving one or more measured values of a first acoustic quantity measured at a set of measurement locations; defining 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; computing a second acoustic quantity for at least one target location from a superposition of the set of wave functions multiplied by respective expansion coefficients;
wherein the computing comprises determining the expansion coefficients from a least-norm fit of the superposition of the set of wave functions to the received measured values. - View Dependent Claims (2, 3, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 21)
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4. A method of reconstructing a sound field at least one target location, the sound field being generated by at least one sound source, the method comprising:
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receiving one or more measured values of a first acoustic quantity measured at a set of measurement locations; defining 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; computing a second acoustic quantity for at least one target location from a superposition of the set of wave functions multiplied by respective expansion coefficients, the measurement locations and the at least one target location being located in a first source-free region, and the virtual source locations being located outside the first source-free region; wherein the defining comprises (a) defining a respective scaling surface for each of the defined virtual source locations, the scaling surface being located outside the first source-free region;
region, and (b) scaling each of the set of wave functions to each have a predetermined amplitude on the scaling surface of the corresponding virtual source location. - View Dependent Claims (5)
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17. A processing apparatus for reconstructing a sound field, the processing device comprising 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; and compute a second acoustic quantity for at least one target location from a superposition of the set of wave functions multiplied by respective expansion coefficients;
wherein the computing comprises determining the expansion coefficients from a least-norm fit of the superposition of the set of wave functions to the received measured values. - View Dependent Claims (19, 20)
- and a processing unit configured to;
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18. 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; and compute a second acoustic quantity for at least one target location from a superposition of the set of wave functions multiplied by respective expansion coefficients, the measurement locations and the at least one target location being located in a first source-free region, and the virtual source locations being located outside the first source-free region; wherein the processing unit is adapted (a) to define a respective scaling surface for each of the defined virtual source locations, the scaling surface being located outside the first source-free region; and
(b) to scale each of the set of wave functions to each have a predetermined amplitude on the scaling surface of the corresponding virtual source location.
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Specification