Method and system of representing an acoustic field
First Claim
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1. Method for representing an acoustic field comprising the steps of:
- using acquisition means comprising one or more elementary sensors that are exposed to said acoustic field to obtain measurement signals that are measurements of the acoustic field by the acquisition means and that are dependant on characteristics of the acquisition means;
determining encoding filters that are representative of at least the structural characteristics of said acquisition means;
processing said measurement signals by applying said encoding filters to these signals in order to determine a finite number of coefficients representative over time and in the three-dimensional space of said acoustic field, said coefficients being representative of said acoustic field and substantially independent of the characteristics of said acquisition means; and
issuing a representation of said acoustic field based on said coefficients.
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Abstract
A method of representing a sound field includes the steps of acquiring measurement signals (cn) which are delivered by simple sensors (2n) that are exposed to sound field (P) determining encoding filters which are representative of at least the structural characteristics of the sensors and processing the measurement signals (cn) by applying the encoding filters to the signals (cn), in order to determine a finite number of representative coefficients over time and in the three-dimensional space of the sound field (P).
22 Citations
22 Claims
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1. Method for representing an acoustic field comprising the steps of:
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using acquisition means comprising one or more elementary sensors that are exposed to said acoustic field to obtain measurement signals that are measurements of the acoustic field by the acquisition means and that are dependant on characteristics of the acquisition means; determining encoding filters that are representative of at least the structural characteristics of said acquisition means; processing said measurement signals by applying said encoding filters to these signals in order to determine a finite number of coefficients representative over time and in the three-dimensional space of said acoustic field, said coefficients being representative of said acoustic field and substantially independent of the characteristics of said acquisition means; and issuing a representation of said acoustic field based on said coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16)
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11. Method for representing an acoustic field comprising the steps of:
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using acquisition means comprising one or more elementary sensors that are exposed to the acoustic field to obtain measurement signals that are measurements of the acoustic field by said acquisition means and that are dependant on characteristics of said acquisition means; determining encoding filters that are representative of structural characteristics of said acquisition means; processing the measurement signals by applying the encoding filters to the measurement signals to determine a finite number of coefficients representative over time and in a three-dimensional space of the acoustic field, the coefficients being representative of the acoustic field and substantially independent of characteristics of the acquisition means; and issuing a representation of the acoustic field based on the coefficients, wherein said determining step comprises; a sub-step involving the determination of a sampling matrix that is representative of the acquisition capacities of said acquisition means; a sub-step involving the determination of an intercorrelation matrix that is representative of the similarity between said measurement signals issued by the elementary sensors forming said acquisition means; and a substep involving the determination of an encoding matrix from said sampling matrix, said intercorrelation matrix and a parameter that is representative of a desired compromise between faithfulness of representation of the acoustic field and minimization of the background noise caused by the acquisition means, which matrix is representative of said encoding filters. - View Dependent Claims (12, 13, 14)
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17. Device for representing an acoustic field, comprising:
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acquisition means that have one or more elementary sensors that issue measurement signals when they are exposed to said acoustic field, the measurement signals being dependent on characteristics of said acquisition means; and a module for processing the measurement signals by applying encoding filters that are representative of at least the structural characteristics of said acquisition means to these measurement signals, in order to issue a signal that comprises a finite number of coefficients representative over time and in the three-dimensional space of said acoustic field, said coefficients being representative of said acoustic field and substantially independent of the characteristics of said acquisition means. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification