Subject: Re: Frequency response of the low-pass filter(s) applied to the half-wave rectified output of the cochlea From: Roy Patterson <rdp1@xxxxxxxx> Date: Mon, 18 Dec 2006 11:05:07 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Arturo Camacho wrote: > Dear members of the list, > > I am looking for literature about the specifications of the frequency > response of the low-pass filter(s) applied to the half-wave rectified > output of the cochlea. In particular, I would like to know if the same > type of filtering is applied to each channel or if the filter > characteristics may vary on each channel. We discuss this issue in a series of papers on pitch perception in JASA. Probably the most relevant are Yost, W.A., Patterson, R.D. and Sheft, S. (1998). The role of the envelope in processing iterated rippled noise. J. Acoust. Soc. Am. 104 2349-2361. Patterson, R.D. , Yost, W.A., Handel, S. and Datta, J.A. (2000). The perceptual tone/noise ratio of merged iterated rippled noises. J. Acoust. Soc. Am. 107 1578-1588. The former demonstrates that the cutoff frequency needs to be in the 1000 Hz region rather than the 100 Hz region. The latter contains a model that we fitted to some rather sensitive pitch strength data. It suggests a fourth order lowpass filter with an 800-Hz cutoff frequency (if my memory serves me). In other papers we have estimated the cutoff to be as high as 1200 Hz. I can provide pdf's of these papers if you do not have access to JASA. REgards Roy Patterson > I have searched on Internet but > I have not found consistency in the specification of the filter(s) used by > different authors. Any reference to related literature will be highly > appreciated. > > Thanks, > > Arturo > -- * ** *** * ** *** * ** *** * ** *** * ** *** * Roy D. Patterson Centre for the Neural Basis of Hearing Department of Physiology, Development and Neuroscience University of Cambridge Downing Street, Cambridge, CB2 3EG http://www.pdn.cam.ac.uk/cnbh/ phone: +44 (1223) 333819 office fax: +44 (1223) 333840 department email rdp1@xxxxxxxx or roy.patterson@xxxxxxxx