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</div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Appearance</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p><b>Dereverberation</b> is the process by which the effects of <a href="/wiki/Reverberation" title="Reverberation">reverberation</a> are removed from sound, after such reverberant sound has been picked up by <a href="/wiki/Microphone" title="Microphone">microphones</a>. Dereverberation is a subtopic of acoustic <a href="/wiki/Digital_signal_processing" title="Digital signal processing">digital signal processing</a> and is most commonly applied to speech but also has relevance in some aspects of music processing. Dereverberation of audio (speech or music) is a corresponding function to <a href="/wiki/Blind_deconvolution" title="Blind deconvolution">blind deconvolution</a> of images, although the techniques used are usually very different. Reverberation itself is caused by sound reflections in a room (or other enclosed space) and is quantified by the room <a href="/wiki/Reverberation_time" class="mw-redirect" title="Reverberation time">reverberation time</a> and the direct-to-reverberant ratio. The effect of dereverberation is to increase the direct-to-reverberant ratio so that the sound is perceived as closer and clearer. </p><p>A main application of dereverberation is in <a href="/wiki/Hands-free" class="mw-redirect" title="Hands-free">hands-free</a> phones and desktop <a href="/wiki/Teleconference" title="Teleconference">conferencing</a> terminals because, in these cases, the microphones are not close to the source of sound – the talker’s mouth – but at arm’s length or further distance. As well as telecommunications, dereverberation is importantly applied in <a href="/wiki/Automatic_speech_recognition" class="mw-redirect" title="Automatic speech recognition">automatic speech recognition</a> because speech recognizers are usually error-prone in reverberant scenarios. </p><p>Dereverberation became established as a topic of scientific research in the years 2000 to 2005.,<sup id="cite_ref-IWAENC_1-0" class="reference"><a href="#cite_note-IWAENC-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> although a few notable early articles exist.<sup id="cite_ref-RYALL_2-0" class="reference"><a href="#cite_note-RYALL-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The first scientific text book on the topic was published in 2010.<sup id="cite_ref-Springer2010_3-0" class="reference"><a href="#cite_note-Springer2010-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> A global scientific study sponsored by the <a href="/wiki/IEEE" class="mw-redirect" title="IEEE">IEEE</a> Technical Committee for Audio and Acoustic Signal Processing took place in 2014.<sup id="cite_ref-REVERB_4-0" class="reference"><a href="#cite_note-REVERB-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>Three different approaches can be followed<sup id="cite_ref-HABETS_5-0" class="reference"><a href="#cite_note-HABETS-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> to perform dereverberation. In the first approach, reverberation is cancelled by exploiting a mathematical model of the acoustic system (or room) and, after estimation of the room acoustic model parameters, forming an estimate for the original signal. In the second approach, reverberation is suppressed by treating it as a type of (convolutional) noise and performing a de-noising process specifically adapted to reverberation. In the third approach, the original dereverberated signal is directly estimated from the microphone signals using, for example, a deep neural network machine learning approach or alternatively a multichannel linear filter. Examples of the most effective methods in the state-of-the art include approaches based on <a href="/wiki/Linear_prediction" title="Linear prediction">linear prediction</a><sup id="cite_ref-JUKIC_6-0" class="reference"><a href="#cite_note-JUKIC-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-DELCROIX_7-0" class="reference"><a href="#cite_note-DELCROIX-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dereverberation&action=edit&section=1" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-IWAENC-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-IWAENC_1-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20180501004622/https://pdfs.semanticscholar.org/a048/3242be7e2cc2fa3ba1b54cc708193a100d23.pdf">P. A. Naylor and N. D. Gaubitch, “Speech dereverberation,” in Proc. Intl. Workshop Acoust. Echo Noise Control (IWAENC), 2005.</a></span> </li> <li id="cite_note-RYALL-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-RYALL_2-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://patents.google.com/patent/GB509613A/en">L. E. Ryall, "Improvements in electric signal amplifiers incorporating voice-operated devices", Patent GB509613A, 1938.</a></span> </li> <li id="cite_note-Springer2010-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-Springer2010_3-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://books.google.com/books?id=SYuTUqiB-q4C&dq=speech+dereverberation+naylor&pg=PA16">P. A. Naylor and N. D. Gaubitch, Eds., Speech Dereverberation. Springer, 2010.</a></span> </li> <li id="cite_note-REVERB-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-REVERB_4-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://reverb2014.dereverberation.com">The REVERB Challenge</a></span> </li> <li id="cite_note-HABETS-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-HABETS_5-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://www.audiolabs-erlangen.de/content/05-fau/professor/00-habets/06-activities/Keynote_Habets_2016_AES_60.pdf">E. Habets, Fifty Years of Reverberation Reduction, Audio Engineering Society 60th Conference on Dereverberation and Reverberation of Audio Music and Speech</a></span> </li> <li id="cite_note-JUKIC-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-JUKIC_6-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.dreams-itn.eu/uploads/SP2014_38.pdf">A. Jukic et al., "Multi-Channel Linear Prediction-Based Speech Dereverberation With Sparse Priors"</a></span> </li> <li id="cite_note-DELCROIX-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-DELCROIX_7-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://reverb2014.dereverberation.com/workshop/reverb2014-papers/1569897299.pdf">M. Delcroix et al, Linear Prediction-based Dereverberation with Advanced Speech Enhancement and Recognition Technologies, REVERB Challenge Workshop, 2014</a></span> </li> </ol></div></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Dereverberation&oldid=1237406765">https://en.wikipedia.org/w/index.php?title=Dereverberation&oldid=1237406765</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Digital_signal_processing" title="Category:Digital signal processing">Digital signal processing</a></li><li><a href="/wiki/Category:Audio_effects" title="Category:Audio effects">Audio effects</a></li><li><a href="/wiki/Category:Acoustics" title="Category:Acoustics">Acoustics</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 29 July 2024, at 16:59<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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