[AUDITORY] Finding from Greenwood, 1961 ("Hornsby, Benjamin Wade Young" )

Subject: [AUDITORY] Finding from Greenwood, 1961 From: "Hornsby, Benjamin Wade Young" <ben.hornsby@xxxxxxxx> Date: Sat, 6 Nov 2021 21:10:38 +0000 --_000_BN9PR12MB5052DF277A9F64AF1934A5CC978F9BN9PR12MB5052namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi All, I am hoping to pick the brains of those more knowledgeable about this than = I am. I am reading some classic masking papers with a doctoral student and = we have a question about a finding reported by Greenwood (1961). Greenwood, D. D. (1961). Auditory masking and the critical band. The journa= l of the acoustical society of America, 33(4), 484-502. https://asa.scitation.org/doi/abs/10.1121/1.1908699?casa_token=3D5nyI-2IWfC= UAAAAA:F_c_w65ZXWcIQE4SDr-qrEcGTLJ9QUtRChx4B2t4rOAdEv8_PJ3wKhHxvfNCaOwJ0Eju= cY_H0J3roQ In this paper Greenwood examined critical bandwidths using a band widening = masking paradigms to measure "masked audiograms" as he systematically widen= ed the bandwidth of a masking noise. In one experiment he looked at growth= of masking for his masked audiograms by systematically increasing the spec= trum level (and overall level) of the various noise bands. He did this for = noise bands that were narrower and wider than the critical bandwidth. For noise bandwidths that were greater than the critical band he showed a l= inear growth of masking for tones centered in the noise band (i.e., linear = in band masking). However, when the noise bandwidth was less than the criti= cal bandwidth, growth of masking showed a "jog" in the growth of masking fu= nction for tones centered in the narrow noise band. That is masked threshol= d appeared to decrease (~3 dB) as noise power increased when the level of t= he noise reached what he called a "transition level" of around 50 dB sensat= ion level. However, as levels increased above this "transition" level, grow= th of masking again seemed linear. Figure 6 on p. 493 of the paper shows th= e finding I am talking about. It would not be the first time I misinterpreted an older (and newer) paper = so I am probably just missing something. However, I was not familiar with t= his finding and wondered if others were aware of it and had thoughts on why= it occurred. Thanks, Ben --_000_BN9PR12MB5052DF277A9F64AF1934A5CC978F9BN9PR12MB5052namp_ Content-Type: text/html; charset="us-ascii" 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" style=3D"word-wrap:= break-word"> <div class=3D"WordSection1"> Hi All,<o:p></o:p> I am hoping to pick the brains of those more knowled= geable about this than I am. I am reading some classic masking papers with = a doctoral student and we have a question about a finding reported by Green= wood (1961). <o:p></o:p> <o:p> </o:p></spa= n> Greenwood, D. D. (1961= ). Auditory masking and the critical band. The journal of the acous= tical society of America, 33(4), 484-502.<o:p></o:p>= <a href=3D"https://asa.scitation.org/doi/abs/10.1121= /1.1908699?casa_token=3D5nyI-2IWfCUAAAAA:F_c_w65ZXWcIQE4SDr-qrEcGTLJ9QUtRCh= x4B2t4rOAdEv8_PJ3wKhHxvfNCaOwJ0EjucY_H0J3roQ">https://asa.scitation.org/doi= /abs/10.1121/1.1908699?casa_token=3D5nyI-2IWfCUAAAAA:F_c_w65ZXWcIQE4SDr-qrE= cGTLJ9QUtRChx4B2t4rOAdEv8_PJ3wKhHxvfNCaOwJ0EjucY_H0J3roQ</a><o:p></o:p> <o:p> </o:p> In this paper Greenwood examined critical bandwidths= using a band widening masking paradigms to measure “masked audiogram= s” as he systematically widened the bandwidth of a masking noise. &nb= sp;In one experiment he looked at growth of masking for his masked audiograms by systematically increasing the spectrum level = (and overall level) of the various noise bands. He did this for noise bands= that were narrower and wider than the critical bandwidth.<o:p></o:p> <o:p> </o:p> For noise bandwidths that were greater than t= he critical band he showed a linear growth of masking for tones centered in= the noise band (i.e., linear in band masking). However, when the noise ban= dwidth was less than the critical bandwidth, growth of masking showed a “= jog” in the growth of masking function for tones centered in the narr= ow noise band. That is masked threshold appeared to decrease (~3 dB) as noi= se power increased when the level of the noise reached what he called a “transition level” of around 50 dB se= nsation level. However, as levels increased above this “transition&#8= 221; level, growth of masking again seemed linear. Figure 6 on p. 493 of th= e paper shows the finding I am talking about.<o:p></o:p> <o:p> </o:p> It would not be the first time I misinterpreted an o= lder (and newer) paper so I am probably just missing something. However, I = was not familiar with this finding and wondered if others were aware of it = and had thoughts on why it occurred. <o:p></o:p> <o:p> </o:p> Thanks,<o:p></o:p> <o:p> </o:p> Ben<o:p></o:p> </div> </body> </html> --_000_BN9PR12MB5052DF277A9F64AF1934A5CC978F9BN9PR12MB5052namp_--

This message came from the mail archive
src/postings/2021/
maintained by:

DAn Ellis <dpwe@ee.columbia.edu>
Electrical Engineering Dept., Columbia University