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System and method for determining a representation of an acoustic field

A technology of sound field and coordinate system, applied in stereo systems, electrical components, etc., can solve the problems of complex processing of meta-sensors

Active Publication Date: 2006-10-18
TRINNOV AUDIO
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0014] It thus appears that in order to obtain a high-quality representation of the sound field in a multi-channel format, existing capture and processing devices require a large number of regularly distributed meta-sensors and complex processing

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  • System and method for determining a representation of an acoustic field
  • System and method for determining a representation of an acoustic field

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Embodiment Construction

[0061] To understand the coordinate system referenced in this paper, figure 1 A conventional spherical coordinate system is shown.

[0062]The coordinate system is an orthogonal coordinate system having an origin O and including three axes (OX), (OY) and (OZ). use The indicated position is described by its spherical coordinates (r, θ, φ), where r represents the distance to the origin O, θ represents the orientation in the vertical plane and φ represents the orientation in the horizontal plane.

[0063] In this coordinate system, if the sound pressure expressed by p(r, θ, φ, t) is defined for all points at each time t, the sound field is known, and the Fourier transform of the sound pressure is represented by P(r, θ, φ, f), where f represents the frequency.

[0064] The method of the invention is based on the use of spatiotemporal functions that describe the sound field in time and in three spatial dimensions.

[0065] In the illustrated embodiments, these functions are s...

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Abstract

A system for determining a representation of an acoustic field (P) comprising: an acoustic capture device (1) comprising a plurality of metasensors (21 to 2Q) distributed in space and each delivering a measurement signal (c1 to cQ); Said measurement signals (c1 to cQ) apply a filter combination representative of the structural properties of said acquisition means (1) in order to deliver a plurality of acoustic signals (sc1 to scN) to processing means (8), each of which is associated with a relative A predetermined generalized rendering direction association defined by a given point (14) in space. This set of acoustic signals (sc1 to scN) forms a representation of said sound field (P). The invention is characterized in that said metasensors (21 to 2Q) are distributed in a substantially irregular manner in space and said filter combination is representative of said distribution.

Description

technical field [0001] The invention relates to a method, device and system for determining a representation of a sound field in the form of a plurality of acoustic or speech signals each associated with a predetermined generalized reproduction direction defined relative to a given point in space . Background technique [0002] The determination of this representation is based on the use of an acoustic wave capture device comprising a plurality of metasensors arranged in space and each emitting a measurement signal. [0003] These measurement signals are processed in combination by applying filters which are notably representative of structural features of the capture device and predetermined generalized reproduction directions, to obtain a plurality of acoustic signals. [0004] Such a plurality of signals is generally referred to as a "multi-lane signal" and corresponds to a plurality of signals, referred to as "lanes", transmitted in parallel or multiplexed with each oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04S3/00H04S3/02
CPCH04S3/00H04S3/02H04S2400/15
Inventor 雷米·布鲁诺阿诺·拉博里塞巴斯蒂安·蒙图雅
Owner TRINNOV AUDIO
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