Wide-band acoustic holography

A sound field and parameter technology, applied in the field of acoustic holography, can solve problems such as ambiguity and underdetermination of estimation problems

Active Publication Date: 2016-05-04
BRUEL & KJAER SOUND & VIBRATION MEASUREMENT
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Problems solved by technology

In this case, the estimation problem will be at le

Method used

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  • Wide-band acoustic holography
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  • Wide-band acoustic holography

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Embodiment approach

[0125] Step S31: In the initialization step, set one or more processing parameters to their initial values ​​(e.g., source intensity Q 0 and dynamic range D 0 ).

[0126] Step S32: Perform the iterative step of the minimization process, i.e., calculate the direction and length of the minimization step, and calculate the update vector of the source intensity

[0127] Step S33: Make the magnitude greater than D k decibels and in all sources below the strongest source the amplitude is set to zero, resulting in a source intensity of Q k+1 The updated and adjusted vector of .

[0128] Step S34: Updating the dynamic range D k .

[0129] Step S35: If the interruption criterion is met, the method stops and outputs the obtained model and / or the quantities calculated by the model; otherwise the method returns to step S32.

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Abstract

A method of determining a property of a sound field from a plurality of measured sound field parameters, the method comprising: receiving a plurality of measured sound field parameters each indicative of a sound field parameter measured by a sensor of an array of sensors, the sensor being positioned at a measurement position; providing a model of a sound field, the model comprising a set of elementary waves and having associated with it a set of model parameters; computing, from the model, computed values of the sound field parameter at each of the measurement positions and as a function of said model parameters; determining a set of parameter values of the model parameters so as to reduce an error measure by performing an iterative minimization process including a plurality of iterations, the error measure comprising an error term operable to compare the computed and the measured sound field parameters; computing the property of the sound field from the determined set of model parameters.

Description

technical field [0001] The present invention relates to array signal processing of acoustic signals, eg acoustic holography. Background technique [0002] Acoustic holography is a widely used technique for estimating a source or sound field, in particular a sound field close to the source. Acoustic holography typically involves measuring sound parameters away from a source via a sensor array, eg, an array of pressure and / or particle velocity transducers. Measurement techniques involving acoustic holography are becoming increasingly popular in various fields, most notably those of transportation, vehicle and aircraft design, white goods design, NVH (noise, vibration, and harshness), or the like application. [0003] Known acoustic holography methods include Statistical Optimal Near Field Acoustic Holography (SONAH) and Equivalent Source Method (ESM). For example, J. Hald, "Basic theory and properties of statistically optimized near-field acoustical holography", J. Acoust. ...

Claims

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Application Information

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IPC IPC(8): G01H9/00G03H3/00G01V1/00
CPCG01H9/002G01V1/001G03H3/00
Inventor 约尔延·哈尔
Owner BRUEL & KJAER SOUND & VIBRATION MEASUREMENT
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