Re: Rationale for Critical Bands ("reinifrosch@xxxxxxxx" )


Subject: Re: Rationale for Critical Bands
From:    "reinifrosch@xxxxxxxx"  <reinifrosch@xxxxxxxx>
Date:    Tue, 15 Jun 2010 10:11:17 +0000
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

------=_Part_1852_22216126.1276596677629 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hello Dick, =20 According to Chapter 10 of "Signals, Sound, and Sensation" by W. M. Hartman= n (Springer, 1998), the widths of "Cambridge critical bands" are equal to "= equivalent rectangular bandwidths", and these are (mainly?) measured by not= ched-noise experiments. I believe that the widths presented, e.g., in Hartm= ann's Fig. 10.9 are valid for soft tones. During a soft sine-tone of given = frequency (above ~1 kHz), there is a high "active peak" in the curve of bas= ilar-membrane oscillation velocity amplitude versus distance from stapes. S= ee, e.g., my recent paper "Old and New Cochlear Maps", Canadian Acoustics V= ol. 37, No. 3 (2009) 174-175. If one considers a fixed place on the basal h= alf of the basilar membrane (i.e., a given distance from stapes), then ther= e is a corresponding active peak in the curve of basilar-membrane oscillati= on velocity amplitude versus sine-tone frequency. The critical bands coinci= de, on the frequency scale, with the widths of those active peaks. So, the = just described critical bands appear to be defined (mainly?) by basilar-mem= brane oscillation patterns.=20 =20 With best wishes, =20 Reinhart. ----Urspr=C3=BCngliche Nachricht------------------------------- Von: DickLyon@xxxxxxxx Datum: 15.06.2010 03:45 An: <AUDITORY@xxxxxxxx> Betreff: Re: Rationale for Critical Bands Dan, the situation is indeed complicated, but I don't think there's=20 much actual disagreement. [...] ------------------------------------------------ Reinhart Frosch, Dr. phil. nat., r. PSI and ETH Zurich, Sommerhaldenstr. 5B, CH-5200 Brugg. Phone: 0041 56 441 77 72. Mobile: 0041 79 754 30 32. E-mail: reinifrosch@xxxxxxxx . ------=_Part_1852_22216126.1276596677629 Content-Type: text/html;charset="UTF-8" Content-Transfer-Encoding: quoted-printable <html><head><style type=3D'text/css'> <!-- div.bwmail { background-color:#ffffff; font-family: Trebuchet MS,Arial,Helv= etica; font-size: 12px; margin:0; padding:0;} div.bwmail p { margin:0; padding:0; } div.bwmail table { font-family: Trebuchet MS,Arial,Helvetica; font-size: 12= px; } div.bwmail li { margin:0; padding:0; } --> </style> </head><body><div class=3D'bwmail'><P>Hello Dick,</P> <P>&nbsp;</P> <P>According to Chapter 10 of "Signals, Sound, and Sensation" by W. M. Hart= mann (Springer, 1998), the widths of "Cambridge critical bands" are equal t= o "equivalent rectangular bandwidths", and these are (mainly?) measured by = notched-noise experiments. I believe that the widths presented, e.g., in Ha= rtmann's Fig. 10.9 are valid for soft tones. During a soft&nbsp;sine-tone o= f given frequency (above ~1 kHz),&nbsp;there is a high "active peak" in the= curve of basilar-membrane oscillation velocity amplitude versus distance f= rom stapes. See, e.g., my recent paper "Old and New Cochlear Maps", Canadia= n Acoustics Vol. 37, No. 3 (2009) 174-175. If one considers a fixed place o= n the basal half of the basilar membrane (i.e., a given distance from stape= s), then there is a corresponding active peak in the curve of basilar-membr= ane oscillation velocity amplitude versus sine-tone frequency. The critical= bands coincide, on the frequency scale, with the widths of those active pe= aks.&nbsp;So, the just described critical bands appear to be defined (mainl= y?) by basilar-membrane oscillation patterns.&nbsp;</P> <P>&nbsp;</P> <P>With best wishes,</P> <P>&nbsp;</P> <P>Reinhart.</P> <P><BR>----Urspr=C3=BCngliche Nachricht-------------------------------<BR>V= on: DickLyon@xxxxxxxx<BR>Datum: 15.06.2010 03:45<BR>An: &lt;AUDITORY@xxxxxxxx= CGILL.CA&gt;<BR>Betreff: Re: Rationale for Critical Bands<BR><BR>Dan, the s= ituation is indeed complicated, but I don't think there's <BR>much actual d= isagreement. [...]<BR>------------------------------------------------</P> <P>Reinhart Frosch,<BR>Dr. phil. nat.,<BR>r. PSI and ETH Zurich,<BR>Sommerh= aldenstr. 5B,<BR>CH-5200 Brugg.<BR>Phone: 0041 56 441 77 72.<BR>Mobile: 004= 1 79 754 30 32.<BR>E-mail: reinifrosch@xxxxxxxx .<BR><BR></P></div></body= ></html> ------=_Part_1852_22216126.1276596677629--


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