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

AuthorsCobo, Pedro; Fernández, Alejandro ; Palacios, R.; Colina, Carlos de la; Siguero, Manuel
KeywordsAntinoise devices
Noise barriers
Absorption coefficient
Adrienne method
Maximum Length Sequence (MLS) method
Signal subtraction technique
Inverse filtering techniques
Waveform determination
Loudspeaker-microphone setup
Issue DateSep-2004
PublisherSociedade Portuguesa de Acústica
CitationXXXV Congreso Español de Acústica – TecniAcústica 2004. Metrological and experimental acoustics; ID22
AbstractNoise 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.
Description8 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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