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Ein Meßsystem für rechnergestützte Impulsmessungen in der Akustik

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Abstract:

In this work are described direct measurements of the impulse response of acoustic transmission systems which are well-known as equivalent to the complex transmission function. The processing of the experimental data is carried out by a digital computer.

In the interest of adequate signal to noise ratio it is advantageous to replace the short rectangular impulses which are frequently applied as stimulat ion signals by more sophisticated signals (Barker-codes, maximum length sequences). The properties of such signals are fully discussed with regard to acoustic measurements and compared with each other.

As examples to show the practicability of the measurement technique measurements on loudspeakers are described as well as on a particular electro-acoustic transmission system.

Zusammenfassung

In dieser Arbeit werden direkte Messungen der Stoßantwort akustischer Übertragungssysteme beschrieben, die bekanntlich der komplexen Übertragungsfunktion äquivalent ist. Die Verarbeitung der Meßdaten wird dabei von einem Digitalrechner übernommen.

Im Interesse einer ausreichenden Meßdynamik ist es vorteilhaft, die häufig als Anregungssignale verwendeten, kurzen Rechteckimpulse durch kompliziertere Signalarten zu ersetzen (Barker-Codes, Maximalfolgen). Die Eigenschaften solcher Signale werden ausführlich im Hinblick auf akustische Messungen diskutiert und miteinander verglichen.

Als Beispiele für die Anwendung dieser Meßtechnik werden Messungen an Lautsprechern sowie an einer besonderen elektroakustischen Übertragungsanlage beschrieben.

Sommaire

On décrit une technique de mesure directe de la réponse impulsionnelle d'un système de transmission acoustique, laquelle, comme on le sait, est équivalente à la fonction de transfert complexe. Le traitement numérique des données mesurées est effectué par un calculateur numéral.

Dans l'intérêt d'une extension de la dynamique des mesures, il est avantageux de remplacer les impulsions rectangulaires brèves par des signaux plus compliqués mais plus élaborés, comme les codes de Barker ou les suites maximales. On discute des propriétés de tels signaux en relation avec les mesures acoustiques et on les compare entre elles.

Comme exemples d'application, on décrit des mesures sur des haut-parleurs et sur certaines installations électro-acoustiques.

Document Type: Research Article

Publication date: 1980-07-01

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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