Re: [AUDITORY] Gammatone filter bank in MATLABr2019a (Jihad Ibrahim )

Subject: Re: [AUDITORY] Gammatone filter bank in MATLABr2019a From: Jihad Ibrahim <jibrahim@xxxxxxxx> Date: Mon, 20 May 2019 16:25:00 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY> --_000_BL0PR05MB52828C7D66438377AE363151C9060BL0PR05MB5282namp_ Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Hi all, I am a developer in Audio Toolbox at MathWorks, and just wanted to let ever= yone know that we are capturing your comments regarding new R2019a releases= and really appreciate your feedback. It will take us some time to digest this feedback and convert it into user-= visible changes, but I thought I'd share a few notes in the meantime: * Regarding Bastian Epp's initial post, he is right to point out that t= he image might be misleading and interpreted to indicate an equivalence bet= ween the cochlea and the gammatone filter bank. We will aim to remove the i= mage of the basilar membrane in the next release to help avoid that incorre= ct interpretation. * Regarding Richard F. Lyon's post: The confusion here is due to an amb= iguously worded sentence. The gammatone filter bank implemented in Audio To= olbox followed the algorithm described in [1] (Slaney). [1] says the algori= thm is an implementation of an idea proposed by [2] (Patterson et al). [2] = is in general a good primer for understanding [1], which is why we thought = it was good to reference. We think we should reword this more carefully. * The formula stating that the bandwidth is 1.019*erb2hz(fc) does indee= d have a typo. We will fix this ASAP starting from the online documentation= . * Regarding the limited parametrizations of the function(s): So far, Au= dio Toolbox has focused on providing simple and fast implementations of fea= ture extractors. The idea is to find a balance between an expert in auditor= y science and someone looking to build a machine learning or deep learning = application. That being said, if exposing more parameters would enable more= workflows, then we would definitely consider adding more options on the fu= nctions. We plan to investigate alternative options and we may try to reach= out to some of those who commented on this for additional feedback. * We agree that the cubic root is a very common implementation of GTCC= . We will investigate offering the option of using a cubic root in the nonl= inear rectification stage )along with the log option, which is used as well= ). Rabiner and Schafer are referenced because the computation of the deltas= is implemented based on Theory and Applications of Digital Speech Processi= ng. * Regarding Volker Hohmanns' note on the re-synthesis method being non-= optimal: The intention of the example was to showcase a straightforward and= simple usage of the object rather than demonstrate how to best achieve rec= onstruction. We agree that the showcased method is not optimal, and we will= reword the example to clarify this. We will also consider adding an optima= l reconstruction example based on Dr. Hohmanns' paper Regards, Jihad Ibrahim Developer, Audio Toolbox, MathWorks --_000_BL0PR05MB52828C7D66438377AE363151C9060BL0PR05MB5282namp_ Content-Type: text/html; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr= osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:= //www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > <meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"> <div class=3D"WordSection1"> Hi all,<o:p></o:p> <o:p> </o:p> I am a developer in Audio Toolbox at MathWorks, and = just wanted to let everyone know that we are capturing your comments regard= ing new R2019a releases and really appreciate your feedback. <o:p></o:p> <o:p> </o:p> It will take us some time to digest this feedback an= d convert it into user-visible changes, but I thought I’d share a few= notes in the meantime:<o:p></o:p> <ul style=3D"margin-top:0in" type=3D"disc"> <li class=3D"MsoNormal" style=3D"color:black;mso-list:l0 level1 lfo1"><span= style=3D"color:windowtext">Regarding Bastian Epp’s initial post, he = is right to point out that the image might be misleading and interpreted to indicate an equivalence betwe= en the cochlea and the gammatone filter bank. We will aim to remove the ima= ge of the basilar membrane in the next release to help avoid that incorrect= interpretation.<o:p></o:p></li><li class=3D"MsoNormal" style=3D"color:blac= k;mso-list:l0 level1 lfo1">Regarding Richard F. Lyon’s post: The conf= usion here is due to an ambiguously worded sentence. The gammatone filter b= ank implemented in Audio Toolbox followed the algorithm described in [1] (S= laney). [1] says the algorithm is an implementation of an idea proposed by [2] (Pa= tterson et al). [2] is in general a good primer for understanding [1], whic= h is why we thought it was good to reference. We think we should reword thi= s more carefully.<o:p></o:p></li><li class=3D"MsoNormal" style=3D"mso-list:= l0 level1 lfo1">The formula stating that the bandwidth is 1.019*erb2hz(fc) does indeed have a typo. We wi= ll fix this ASAP starting from the online documentation. <o:p></o:p></li><li class=3D"MsoNormal" style=3D"mso-list:l0 level1 = lfo1">Regarding the limited parametrizations of= the function(s): So far, Audio Toolbox has focused on providing simple and= fast implementations of feature extractors. The idea is to find a balance between an expert in auditory science and someone looking to bui= ld a machine learning or deep learning application. That being said, if exp= osing more parameters would enable more workflows, then we would definitely= consider adding more options on the functions. We plan to investigate alternative options and we may try t= o reach out to some of those who commented on this for additional feedback<= /span>. <o:p></o:p></li><li class=3D"MsoNormal" style=3D"color:black;mso-lis= t:l0 level1 lfo1"> We agree that the cubic root is a very common imple= mentation of GTCC. We will investigate offering the option of using a cubic= root in the nonlinear rectification stage )along with the log option, which is used as well). Rabiner and Schafer are referenced because the com= putation of the deltas is implemented based on Theory and Applications of D= igital Speech Processing.<o:p></o:p></li><li class=3D"MsoNormal" sty= le=3D"color:black;mso-list:l0 level1 lfo1">Regarding Volker Hohmanns’ note on the re-synthesis method being non-opt= imal: The intention of the example was to showcase a straightforward and si= mple usage of the object rather than demonstrate how to best achieve recons= truction. We agree that the showcased method is not optimal, and we will reword the example to clarify this. We = will also consider adding an optimal reconstruction example based on Dr. Ho= hmanns’ paper<o:p></o:p></li></ul> <o:p> </o:p> <o:p> </o:p> Regards,<o:p></o:p> Jihad Ibrahim<o:p></o:p> Developer, Audio Toolbox, MathWorks<o:p></o:p> </div> </body> </html> --_000_BL0PR05MB52828C7D66438377AE363151C9060BL0PR05MB5282namp_--

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