Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2957
Título: A hybrid MLS technique for room impulse response estimation
Autor: Paulo, Joel Preto
Martins, Carlos Rodrigues
Bento Coelho, J. L.
Palavras-chave: Acoustical measurement techniques
Room impulse response
Low SNR
Room acoustics
Decay
Length
Data: Abr-2009
Editora: Elsevier SCI LTD
Citação: PAULO, Joel Preto; MARTINS, Carlos Rodrigues; BENTO COELHO, J. L. - A hybrid MLS technique for room impulse response estimation. Applied Acoustics. ISSN 003-682X. Vol. 70, nr. 4 (2009), p. 556-562.
Resumo: The measurement of room impulse response (RIR) when there are high background noise levels frequently means one must deal with very low signal-to-noise ratios (SNR). if such is the case, the measurement might yield unreliable results, even when synchronous averaging techniques are used. Furthermore, if there are non-linearities in the apparatus or system time variances, the final SNR can be severely degraded. The test signals used in RIR measurement are often disturbed by non-stationary ambient noise components. A novel approach based on the energy analysis of ambient noise - both in the time and in frequency - was considered. A modified maximum length sequence (MLS) measurement technique. referred to herein as the hybrid MLS technique, was developed for use in room acoustics. The technique consists of reducing the noise energy of the captured sequences before applying the averaging technique in order to improve the overall SNRs and frequency response accuracy. Experiments were conducted under real conditions with different types of underlying ambient noises. Results are shown and discussed. Advantages and disadvantages of the hybrid MLS technique over standard MLS technique are evaluated and discussed. Our findings show that the new technique leads to a significant increase in the overall SNR. (C) 2008 Elsevier Ltd. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2957
ISSN: 0003-682X
Versão do Editor: http://ac.els-cdn.com/S0003682X08001539/1-s2.0-S0003682X08001539-main.pdf?_tid=cd2bd29a-5758-11e3-922d-00000aab0f02&acdnat=1385552646_c57f81111d8671bea0f723b1c65a178b
Aparece nas colecções:ISEL - Eng. Elect. Tel. Comp. - Artigos

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