Subject: Re: A problem about the relationship between perceived quality and loudness! thanks From: #ARIJIT BISWAS# <arijit17@xxxxxxxx> Date: Sun, 6 Jul 2008 13:16:57 +0800 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>This is a multi-part message in MIME format. ------_=_NextPart_001_01C8DF27.B5D1752F Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-NAIMIME-Disclaimer: 1 X-NAIMIME-Modified: 1 Hi all! I just came across this article in the latest issue of AES Journal: If It=C2=92s Loud, Does That Mean It=C2=92s Bad? Francis Rumsey http://www.aes.org/journal/toc/AES-June2008TOC.cfm Best Regards, ~Arijit -----Original Message----- From: AUDITORY - Research in Auditory Perception on behalf of Bob Masta Sent: Fri 7/4/2008 2:20 PM To: AUDITORY@xxxxxxxx Subject: Re: A problem about the relationship between perceived quality a= nd loudness! thanks =20 Perhaps not exactly what you asked about, but many years=20 ago (1970s?) there was a study where subjects were asked to=20 adjust the volume of various audio systems until they were=20 "loud". The surprising result was that high-powered=20 systems were turned up to much higher output levels than=20 low-powered systems before they were "loud". The=20 explanation given was that subjects apparently correlated=20 increased distortion (more than actual SPL) with "loud".=20 Since amp distortion shoots up as the amp begins to clip at=20 its maximum output level, the low-powered amps of course=20 began to distort while producing lower SPL than the high- powered amps. Best regards, Bob Masta ----------------------------------- On 3 Jul 2008 at 18:20, Junyong You wrote: > Hi All, >=20 > As we know, loudness is an important audio index for human perception. = Is=20 > there anyone studied the relationship between quality distortion and th= e=20 > loudness? I mean, if the same objective distortion happened on the diff= erent=20 > audios (or segments) with different loudness, then, is there some diffe= rence=20 > between the perceived qualities of these two audios (or segments)? >=20 > I guess the loudness should influence the perceived quality of same=20 > distortion, and for the very low and very high loudness, such influence= =20 > maybe not very great, but with ordinary loudness, perhaps the perceived= =20 > distortion will increase following the loudness. >=20 > This is just my guess, anybody can help to work for it with me? Or coul= d you=20 > please give me some advice and references? >=20 > Thank you very much, any feedback will be greatly appreciated. >=20 > Best Regards, >=20 > Junyong=20 Bob Masta =20 D A Q A R T A Data AcQuisition And Real-Time Analysis www.daqarta.com Scope, Spectrum, Spectrogram, Signal Generator Science with your sound card! **Disclaimer**=0AThe sender of this email is NOT authorized to represent = or act on behalf of Nanyang Technological=0AUniversity in any matter or t= ransaction by means of using this email account.=0A=0ANanyang Technologic= al University will not be responsible for any content or views expressed = in this =0Aemail and this email does not express the views or opinions of= the Nanyang Technological University.=0A ------_=_NextPart_001_01C8DF27.B5D1752F Content-Type: text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-NAIMIME-Disclaimer: 1 X-NAIMIME-Modified: 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; charset=3Diso-885= 9-1"> <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version 6.5.7652.2= 4"> <TITLE>RE: A problem about the relationship between perceived quality and= loudness! thanks</TITLE> </HEAD> <BODY> <!-- Converted from text/plain format --> <P><FONT SIZE=3D2>Hi all!<BR> <BR> I just came across this article in the latest issue of AES Journal:<BR> If It’s Loud, Does That Mean It’s Bad? Francis Rums= ey<BR> <BR> <A HREF=3D"http://www.aes.org/journal/toc/AES-June2008TOC.cfm">http://www= =2Eaes.org/journal/toc/AES-June2008TOC.cfm</A><BR> <BR> Best Regards,<BR> ~Arijit<BR> <BR> <BR> <BR> <BR> -----Original Message-----<BR> From: AUDITORY - Research in Auditory Perception on behalf of Bob Masta<B= R> Sent: Fri 7/4/2008 2:20 PM<BR> To: AUDITORY@xxxxxxxx<BR> Subject: Re: A problem about the relationship between perceived quality a= nd loudness! thanks<BR> <BR> Perhaps not exactly what you asked about, but many years<BR> ago (1970s?) there was a study where subjects were asked to<BR> adjust the volume of various audio systems until they were<BR> "loud". The surprising result was that high-powered<BR> systems were turned up to much higher output levels than<BR> low-powered systems before they were "loud". The<BR> explanation given was that subjects apparently correlated<BR> increased distortion (more than actual SPL) with "loud".<BR> <BR> Since amp distortion shoots up as the amp begins to clip at<BR> its maximum output level, the low-powered amps of course<BR> began to distort while producing lower SPL than the high-<BR> powered amps.<BR> <BR> <BR> Best regards,<BR> <BR> Bob Masta<BR> <BR> <BR> -----------------------------------<BR> On 3 Jul 2008 at 18:20, Junyong You wrote:<BR> <BR> > Hi All,<BR> ><BR> > As we know, loudness is an important audio index for human perceptio= n. Is<BR> > there anyone studied the relationship between quality distortion and= the<BR> > loudness? I mean, if the same objective distortion happened on the d= ifferent<BR> > audios (or segments) with different loudness, then, is there some di= fference<BR> > between the perceived qualities of these two audios (or segments)?<B= R> ><BR> > I guess the loudness should influence the perceived quality of same<= BR> > distortion, and for the very low and very high loudness, such influe= nce<BR> > maybe not very great, but with ordinary loudness, perhaps the percei= ved<BR> > distortion will increase following the loudness.<BR> ><BR> > This is just my guess, anybody can help to work for it with me? Or c= ould you<BR> > please give me some advice and references?<BR> ><BR> > Thank you very much, any feedback will be greatly appreciated.<BR> ><BR> > Best Regards,<BR> ><BR> > Junyong<BR> <BR> Bob Masta<BR> <BR> D A Q = A R T A<BR> Data AcQuisition And Real-Time Analysis<BR> www.daqarta.= com<BR> Scope, Spectrum, Spectrogram, Signal Generator<BR> Science with your sound card!<BR> <BR> <BR> </FONT> </P> <DIV><P><HR> **Disclaimer**<BR>=0AThe sender of this email is NOT authorized to repres= ent or act on behalf of Nanyang Technological<BR>=0AUniversity in any mat= ter or transaction by means of using this email account.<BR>=0A<BR>=0ANan= yang Technological University will not be responsible for any content or = views expressed in this <BR>=0Aemail and this email does not express the = views or opinions of the Nanyang Technological University.<BR>=0A </P></DIV> </BODY> </HTML> ------_=_NextPart_001_01C8DF27.B5D1752F--