Re: [AUDITORY] Number of critical bands in human hearing? ("Richard F. Lyon" )

Subject: Re: [AUDITORY] Number of critical bands in human hearing? From: "Richard F. Lyon" <dicklyon@xxxxxxxx> Date: Wed, 13 Sep 2023 22:21:17 -0700 --0000000000002402c506054ad9e9 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I think critical bands are not discrete countable things. But if you want to divide up the range of 20 Hz to 20 kHz into CB-size bands, then there should be an answer, though it will be more at low sound levels than at high sound levels. 24 sounds plausible for moderate sound level. If you count ERBs at low level, you'll get more than that, maybe about 40. Dick On Wed, Sep 13, 2023 at 9:14=E2=80=AFPM David Jackson Morris <dmorris@xxxxxxxx= u.dk> wrote: > Dear all, > > > > In teaching an undergrad course on hearing science the students have > asked, how many critical bands are there in normal healthy hearing? The > text that we use says that there are 24. If I ask ChatGPT it also cites > Fletcher and Munson=E2=80=99s estimation of 24, but what would it know. .= . > > > > Am I right in suspecting that this may have been revised upwards at some > stage (?). Is the collective wisdom of the list able to help with this o= r > point to an authoritative source? > > > > Cheers > > David > > > > > > *David Jackson Morris, PhD, LTCL* > > Associate Professor/Lektor > > > > *University of Copenhagen/K=C3=B8benhavns Universitet* > > Speech Pathology and Audiology/Audiologop=C3=A6di > > Department of Nordic Studies and Linguistics/Institut for Nordiske Studie= r > og Sprogvidenskab > > Emil Holms Kanal 2 > > 2300 Copenhagen S/K=C3=B8benhavn S > > > > Department Homepage > <https://nors.ku.dk/english/staff/?pure=3Den/persons/398661> > > > > > > [image: Title: SD_Logo] - > > > > S=C3=A5dan beskytter vi persondata > <https://informationssikkerhed.ku.dk/persondatabeskyttelse/privatlivspoli= tik/> > > > > > --0000000000002402c506054ad9e9 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">I t= hink critical bands are not discrete countable things.</div><div class=3D"g= mail_default" style=3D"font-size:small">But if you want to divide up the ra= nge of 20 Hz to 20 kHz into CB-size bands, then there should be an answer, = though it will be more at low sound levels than at high sound levels.=C2=A0= 24 sounds plausible for moderate sound level.=C2=A0 If you count ERBs at l= ow level, you'll get more than that, maybe about 40. </div><div clas= s=3D"gmail_default" style=3D"font-size:small">Dick</div><div class=3D"gmail= _default" style=3D"font-size:small"> </div></div> <div class=3D"gmail= _quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Sep 13, 2023 at 9:14= =E2=80=AFPM David Jackson Morris <<a href=3D"mailto:dmorris@xxxxxxxx">d= morris@xxxxxxxx</a>> wrote: </div><blockquote class=3D"gmail_quote" = style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pa= dding-left:1ex"><div class=3D"msg-5301221719702691337"> <div lang=3D"DA" style=3D"overflow-wrap: break-word;"> <div class=3D"m_-5301221719702691337WordSection1"> Dear all,<= /p> =C2=A0 In teaching an undergrad course= on hearing science the students have asked, how many critical bands are th= ere in normal healthy hearing? The text that we use says that there are 24.= =C2=A0 =C2=A0If I ask ChatGPT it also cites Fletcher and Munson=E2=80=99s estimation of 24, but what would it know. . . =C2=A0<= u> =C2=A0 Am I right in suspecting that t= his may have been revised upwards at some stage (?).=C2=A0 Is the collectiv= e wisdom of the list able to help with this or point to an authoritative so= urce?=C2=A0 =C2=A0 Cheers David =C2=A0 =C2=A0 <div> <div> David Jackson Morris, PhD, LTCL<= u> = Associate Professor/Lektor</u= > = =C2=A0 University of Copenhagen/K=C3=B8benhavns Universitet = Speech Pathology and Audiology/Audiologop=C3=A6di Department of N= ordic Studies and Linguistics/Institut for Nordiske Studier og Sprogvidensk= ab Emi= l Holms Kanal 2 2300 Copenhagen= S/K=C3=B8benhavn S =C2=A0<u= > <a href=3D"http= s://nors.ku.dk/english/staff/?pure=3Den/persons/398661" target=3D"_blank"><= span style=3D"color:rgb(5,99,193)">Department Homepage</a> =C2=A0<s= pan style=3D"font-size:12pt;font-family:"Times New Roman",serif;c= olor:black"> =C2=A0<s= pan style=3D"font-size:12pt;font-family:"Times New Roman",serif;c= olor:black"> <img border=3D= "0" width=3D"252" height=3D"87" style=3D"width: 2.625in; height: 0.9062in;"= id=3D"m_-5301221719702691337Billede_x0020_1" alt=3D"Title: SD_Logo">=C2=A0 - =C2=A0<s= pan style=3D"font-size:12pt;font-family:"Times New Roman",serif;c= olor:black"> <a href=3D"https://informationssikkerh= ed.ku.dk/persondatabeskyttelse/privatlivspolitik/" target=3D"_blank">S=C3=A5dan beskytter vi persondata</a> </div> </div> =C2=A0 =C2=A0 </div> </div> </div></blockquote></div> --0000000000002402c506054ad9e9--

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