Publication

Sound pressure estimation at an electroacoustic transducer's voicing face by way of all-electrical sensing

Hervé Lissek, Florian Sandoz
2008
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Résumé

When it comes to designing active control disposals, sound pressure sensing is usually required. In the framework of active control of acoustic impedance, this work aims at conceiving a digital estimator that processes voltage and current measurement to compute an estimation of the pressure in the vicinity of the diaphragm of an electro-dynamic speaker. After dealing with modeling concerns of the actuator, the bilinear transform is used to obtain equations of two IIR filters. An adaptive identification using the LMS algorithm and a SVD-based identification are tested to compute filters coefficient, both leading to poor experimental results. Accordingly, the actual transfer functions of the speaker are measured and optimal IIR filters are designed using the simulated annealing algorithm. It is then shown that good results can be achieved experimentally.

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Concepts associés (33)
Filtre numérique
En électronique, un filtre numérique est un élément qui effectue un filtrage à l'aide d'une succession d'opérations mathématiques sur un signal discret. C'est-à-dire qu'il modifie le contenu spectral du signal d'entrée en atténuant ou éliminant certaines composantes spectrales indésirées. Contrairement aux filtres analogiques, qui sont réalisés à l'aide d'un agencement de composantes physiques (résistance, condensateur, inductance, transistor, etc.
Filter design
Filter design is the process of designing a signal processing filter that satisfies a set of requirements, some of which may be conflicting. The purpose is to find a realization of the filter that meets each of the requirements to a sufficient degree to make it useful. The filter design process can be described as an optimization problem where each requirement contributes to an error function that should be minimized. Certain parts of the design process can be automated, but normally an experienced electrical engineer is needed to get a good result.
Filtre linéaire
Un filtre linéaire est, en traitement du signal, un système qui applique un opérateur linéaire à un signal d'entrée. Les filtres linéaires sont rencontrés le plus souvent en électronique, mais il est possible d'en trouver en mécanique ou dans d'autres technologies. Une réponse impulsionnelle est la sortie d'un système dont l'entrée est une impulsion de Dirac(). Les filtres linéaires peuvent être divisés en deux groupes : les filtres à réponse impulsionnelle infinie et les filtres à réponse impulsionnelle finie.
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MOOCs associés (6)
Digital Signal Processing I
Basic signal processing concepts, Fourier analysis and filters. This module can be used as a starting point or a basic refresher in elementary DSP
Digital Signal Processing II
Adaptive signal processing, A/D and D/A. This module provides the basic tools for adaptive filtering and a solid mathematical framework for sampling and quantization
Digital Signal Processing III
Advanced topics: this module covers real-time audio processing (with examples on a hardware board), image processing and communication system design.
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