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Open Access item In situ absorption measurement of antinoise devices using pre-determined pulse waveforms

Authors:Cobo, Pedro
Fernández, Alejandro
Palacios, R.
Colina, Carlos de la
Siguero, Manuel
Keywords:Antinoise devices, Noise barriers, Absorption coefficient, Adrienne method, Maximum Length Sequence (MLS) method, Signal subtraction technique, Inverse filtering techniques, Waveform determination, Loudspeaker-microphone setup
Issue Date:Sep-2004
Publisher:Sociedade Portuguesa de Acústica
Citation:XXXV Congreso Español de Acústica – TecniAcústica 2004. Metrological and experimental acoustics; ID22
Abstract:Noise barriers can be characterized by using the Adrienne method which combines MLS signals with the subtraction technique. This paper deals with a method to shape the loudspeaker-microphone impulse response which utilizes inverse filtering techniques to design the waveform radiated by the loudspeaker according to some prescribed criterion. For instance, zero-phase cosine-magnitude waveforms provide minimum length within a given frequency band. Therefore, this technique allows approaching the microphone to the loudspeaker, and as a consequence, reduces the lowest reliable frequency of the absorption measurement.
Description:8 pages, 6 figures.-- Comunicación presentada en: XXXV Congreso Español de Acústica – TecniAcústica 2004, IV Congreso Iberoamericano de Acústica, IV Congreso Ibérico de Acústica y EAA Symposium "Environmental and Architectural Acoustics" (Guimaraes, 14-17 Sep 2004).
Appears in Collections:(IA) Comunicaciones congresos

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