Subject: Re: A problem about the relationship between perceived quality and loudness! thanks From: "Beerends, J.G. (John)" <john.beerends@xxxxxxxx> Date: Mon, 7 Jul 2008 07:28:04 +0200 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>The problem about the relationship between perceived quality and loudness/distortion is currently being studied in Q9 of ITU-T Study Group 12 in the P.OLQA standardization (speech quality), the successor of PESQ www.pesq.org (which is the sucessor of PSQM www.psqm.com). In both PSQM and PESQ development the level was kept constant, in P.OLQA level is changed between -20dB and +6 dB. Results will be made available after the benchmark (2009). John Beerends TNO Information and Communication Technology The Netherlands -----Original Message----- From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx On Behalf Of Junyong You Sent: donderdag 3 juli 2008 17:20 To: AUDITORY@xxxxxxxx Subject: A problem about the relationship between perceived quality and loudness! thanks Hi All, As we know, loudness is an important audio index for human perception. Is there anyone studied the relationship between quality distortion and the loudness? I mean, if the same objective distortion happened on the different audios (or segments) with different loudness, then, is there some difference between the perceived qualities of these two audios (or segments)? I guess the loudness should influence the perceived quality of same distortion, and for the very low and very high loudness, such influence maybe not very great, but with ordinary loudness, perhaps the perceived distortion will increase following the loudness. This is just my guess, anybody can help to work for it with me? Or could you please give me some advice and references? Thank you very much, any feedback will be greatly appreciated. Best Regards, Junyong This e-mail and its contents are subject to the DISCLAIMER at http://www.tno.nl/disclaimer/email.html