Subject: unsubscribe From: M Z <measure_0@xxxxxxxx> Date: Sun, 23 Nov 2008 15:00:58 -0800 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--0-1955438001-1227481258=:95127 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable #yiv1781688249 .hmmessage P { margin:0px;padding:0px;} #yiv1781688249 { font-size:10pt;font-family:Verdana;} Dear Madam or Sir, I would like to stop becoming email from this list. Please could you take my=A0email ''measure_0@xxxxxxxx" off the list. Best regards, MZ > Date: Fri, 14 Nov 2008 11:43:50 +0100 > From: auditorylist@xxxxxxxx > Subject: HRTF failure > To: AUDITORY@xxxxxxxx >=20 > Dear List, >=20 > We encounter a problem when trying to place a sound at a virtual=20 > position in space by means of head related transfer functions (HRTF). >=20 > We use sounds from the IAPS database (International Affective Digitized= =20 > Sounds System, Bradley & Lang) as well as simple white noise of six=20 > seconds duration. We use the Kemar HRTF, the "compact data" with zero=20 > elevation. We convolve the original sound data with the HRTF data as=20 > suggested in the documentation. The final sounds are presented using=20 > Beyer Dynamic DT770 headphones. >=20 > We have tested the precision with which our sounds are placed in virtual= =20 > space, by presenting them to eight listeners. The listeners had a=20 > touchscreen lying on their lap, with a circle plotted on it, and they=20 > could indicated the direction where they perceived that the sound came=20 > from. We presented to them in total 144 sounds, 72 noises and 72 IAPS=20 > sounds, coming from 36 virtual directions (0=B0, 10=B0, 20=B0...) in=20 > randomized order. >=20 > The results are shown in a figure that I put in the internet: > http://www.uni-kiel.de/psychologie/emotion/hrtf/direction.gif > The red dots are from IAPS sounds, the yellow dots are from the noises.= =20 > The x-axis shows the "true" (virtual) angle, the y-axis shows the=20 > estimated angle. As can be seen in this figure, listeners could well=20 > discriminate between sounds from the left and sounds from the right. But= =20 > not more than that. There is a certain reduction of variance for sounds= =20 > coming from 90=B0 and from 270=B0, but there is no correlation with angle= =20 > within one hemifield. >=20 > Now we are eager to learn from you: What could be the cause for this=20 > failure? >=20 > A) HRTFs are not better than that. > B) The headphones are inadequate. > C) It must be a programming error (we don't think so) > D) .... >=20 > We are grateful for any help in interpreting the possible cause for this= =20 > failure. >=20 > Thank you very much in advance, > Chris >=20 > --=20 > Christian Kaernbach > Christian-Albrechts-Universit=E4t zu Kiel > Germany > www.kaernbach.de Connect to the next generation of MSN Messenger=A0 Get it now! =0A=0A=0A = --0-1955438001-1227481258=:95127 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable <table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"= top" style=3D"font: inherit;"><BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGI= N-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"> <DIV id=3Dyiv1781688249> <STYLE> #yiv1781688249 .hmmessage P { margin:0px;padding:0px;} #yiv1781688249 { font-size:10pt;font-family:Verdana;} </STYLE> Dear Madam or Sir,<BR><BR>I would like to stop becoming email from this lis= t.<BR>Please could you take my email <B><A href=3D"mailto:''measure_0@xxxxxxxx= yahoo.com">''measure_0@xxxxxxxx</A>"</B> off the list.<BR><BR>Best regards= ,<BR>MZ<BR><BR>> Date: Fri, 14 Nov 2008 11:43:50 +0100<BR>> From: aud= itorylist@xxxxxxxx<BR>> Subject: HRTF failure<BR>> To: AUDITORY@xxxxxxxx= ISTS.MCGILL.CA<BR>> <BR>> Dear List,<BR>> <BR>> We encounter a = problem when trying to place a sound at a virtual <BR>> position in spac= e by means of head related transfer functions (HRTF).<BR>> <BR>> We u= se sounds from the IAPS database (International Affective Digitized <BR>>= ; Sounds System, Bradley & Lang) as well as simple white noise of six <= BR>> seconds duration. We use the Kemar HRTF, the "compact data" with ze= ro <BR>> elevation. We convolve the original sound data with the HRTF da= ta as <BR>> suggested in the documentation. The final sounds are presented using <BR>> Beyer Dynamic DT770 headphones.<BR>> <BR>> = We have tested the precision with which our sounds are placed in virtual <B= R>> space, by presenting them to eight listeners. The listeners had a <B= R>> touchscreen lying on their lap, with a circle plotted on it, and the= y <BR>> could indicated the direction where they perceived that the soun= d came <BR>> from. We presented to them in total 144 sounds, 72 noises a= nd 72 IAPS <BR>> sounds, coming from 36 virtual directions (0=B0, 10=B0,= 20=B0...) in <BR>> randomized order.<BR>> <BR>> The results are s= hown in a figure that I put in the internet:<BR>> http://www.uni-kiel.de= /psychologie/emotion/hrtf/direction.gif<BR>> The red dots are from IAPS = sounds, the yellow dots are from the noises. <BR>> The x-axis shows the = "true" (virtual) angle, the y-axis shows the <BR>> estimated angle. As c= an be seen in this figure, listeners could well <BR>> discriminate between sounds from the left and sounds from the right. But <BR>> not m= ore than that. There is a certain reduction of variance for sounds <BR>>= coming from 90=B0 and from 270=B0, but there is no correlation with angle = <BR>> within one hemifield.<BR>> <BR>> Now we are eager to learn f= rom you: What could be the cause for this <BR>> failure?<BR>> <BR>>= ; A) HRTFs are not better than that.<BR>> B) The headphones are inadequa= te.<BR>> C) It must be a programming error (we don't think so)<BR>> D= ) ....<BR>> <BR>> We are grateful for any help in interpreting the po= ssible cause for this <BR>> failure.<BR>> <BR>> Thank you very muc= h in advance,<BR>> Chris<BR>> <BR>> -- <BR>> Christian Kaernbac= h<BR>> Christian-Albrechts-Universit=E4t zu Kiel<BR>> Germany<BR>>= www.kaernbach.de<BR><BR> <HR> Connect to the next generation of MSN Messenger <A href=3D"http://ima= gine-msn.com/messenger/launch80/default.aspx?locale=3Den-us&source=3Dwl= mailtagline" target=3D_blank rel=3Dnofollow>Get it now! </A></DIV></BLOCKQU= OTE></td></tr></table><br>=0A=0A --0-1955438001-1227481258=:95127--
