Extraction of the envelope from impulse responses using pre-processed energy detection for early decay estimation.
Identifieur interne : 000198 ( Main/Exploration ); précédent : 000197; suivant : 000199Extraction of the envelope from impulse responses using pre-processed energy detection for early decay estimation.
Auteurs : Simona De Cesaris [Italie] ; Dario D'Orazio [Italie] ; Federica Morandi [Italie] ; Massimo Garai [Italie]Source :
- The Journal of the Acoustical Society of America ; 2015.
Abstract
The Schroeder's backward integration method and its applications have been widely studied in the literature; some papers analyze the performance of the method, some others suggest various enhancement techniques. In spite of these findings, there exist several cases where the energy decay curve extracted using the classical backward integration method and the parameters computed from it seem not always representative of the phenomenon under study. Among them, the cases where the early decay is dependent on strong, distinct reflections occurring just after the direct wave, as in most Italian opera houses. Other cases are measured impulse responses with a very low signal-to-noise ratio or missing the direct wave. In the literature, alternatives to the Schroeder's method have been proposed, ranging from Hilbert transform to non-linear processing techniques. In this work a method for the extraction of the envelope based on pre-processed energy detection for early decay estimation is proposed. It is shown that it returns an envelope well matching the first part of the decay even in non-linear cases, returning detailed information on the first part of the decay. The performance of the proposed method is presented and discussed for some exemplary impulse responses measured in historical opera houses. A preliminary study on the perceptive relevance of the method is finally presented.
DOI: 10.1121/1.4931904
PubMed: 26520334
Affiliations:
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Bologna</wicri:regionArea><wicri:noRegion>Bologna</wicri:noRegion></affiliation></author></analytic><series><title level="j">The Journal of the Acoustical Society of America</title><idno type="e-ISSN">1520-8524</idno><imprint><date when="2015" type="published">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The Schroeder's backward integration method and its applications have been widely studied in the literature; some papers analyze the performance of the method, some others suggest various enhancement techniques. In spite of these findings, there exist several cases where the energy decay curve extracted using the classical backward integration method and the parameters computed from it seem not always representative of the phenomenon under study. Among them, the cases where the early decay is dependent on strong, distinct reflections occurring just after the direct wave, as in most Italian opera houses. Other cases are measured impulse responses with a very low signal-to-noise ratio or missing the direct wave. In the literature, alternatives to the Schroeder's method have been proposed, ranging from Hilbert transform to non-linear processing techniques. In this work a method for the extraction of the envelope based on pre-processed energy detection for early decay estimation is proposed. It is shown that it returns an envelope well matching the first part of the decay even in non-linear cases, returning detailed information on the first part of the decay. The performance of the proposed method is presented and discussed for some exemplary impulse responses measured in historical opera houses. A preliminary study on the perceptive relevance of the method is finally presented.</div></front></TEI><affiliations><list><country><li>Italie</li></country></list><tree><country name="Italie"><noRegion><name sortKey="De Cesaris, Simona" sort="De Cesaris, Simona" uniqKey="De Cesaris S" first="Simona" last="De Cesaris">Simona De Cesaris</name></noRegion><name sortKey="D Orazio, Dario" sort="D Orazio, Dario" uniqKey="D Orazio D" first="Dario" last="D'Orazio">Dario D'Orazio</name><name sortKey="Garai, Massimo" sort="Garai, Massimo" uniqKey="Garai M" first="Massimo" last="Garai">Massimo Garai</name><name sortKey="Morandi, Federica" sort="Morandi, Federica" uniqKey="Morandi F" first="Federica" last="Morandi">Federica Morandi</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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