Subject: Re: Music Transmission Index From: =?iso-8859-1?Q?Lars_Bramsl=F8w?= <lab(at)OTICON.DK> Date: Tue, 11 Jan 2005 22:29:25 +0100This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_000_01C4F824.9F71C140 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C4F824.9F71C140" ------_=_NextPart_001_01C4F824.9F71C140 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear List =20 As already suggested, the music transmission index is another term for = an objective sound quality metric, such as the PESQ and PEAQ. This is a = very interesting topic where quite some progress has been made within ITU = for standardized metrics. These metrics are usually relative to 'perfect' = as they require a reference signal, i.e. the original source signal. This = can easily be obtained when the device under investigation is a codec, a transmission line or similar, but in other cases a reference is not available. Examples are loudspeakers (there is no perfect acoustical transducer) and hearing aids (there are deliberate modifications to the signal). A few measures have been developed without reference, one = being my Ph.D. thesis (surprise:-), which was an investigation on the = feasibility of an objective measure for estimation of reproduced sound quality in = hearing aids. Both normal-hearing and hearing-impaired listeners were modeled. =20 I have just published a summary paper on my thesis in the recent issue = of Acta Acustica: =20 L. Bramsl=F8w (2004): An Objective Estimate of the Perceived Quality of Reproduced Sound in Normal and Impaired Hearing, Acta Acustica 90(6), = 1007 - 1018 =20 This issue has a thematic section based on the 2003 ISCA workshop on 'Auditory Quality of Systems' and contains several interesting papers = that are good starting points for an overview of sound quality measures. = See: http://www.eaa-fenestra.org/Products/ActaAcustica/CurrentIssue/current_i= ssue .pdf <http://www.eaa-fenestra.org/Products/ActaAcustica/CurrentIssue/current_= issu e.pdf>=20 =20 My thesis (3 out of 4 reports) is available here: =20 Objective Scaling of Sound Quality for Normal-Hearing and = Hearing-Impaired Listeners : http://www.dat.dtu.dk/docs/LA_report_54.pdf <http://www.dat.dtu.dk/docs/LA_report_54.pdf>=20 =20 A neural network model for prediction of sound quality: http://www.dat.dtu.dk/docs/LA_report_53.pdf <http://www.dat.dtu.dk/docs/LA_report_53.pdf>=20 =20 An auditory model with hearing loss: http://www.dat.dtu.dk/docs/LA_report_52.pdf <http://www.dat.dtu.dk/docs/LA_report_52.pdf>=20 =20 I hope this can be of help. =20 Regards, =20 Lars Bramsl=F8w =20 = <http://www.oticon.com/eprise/main/Oticon/_images/z_other/line_sig.gif> =09 Lars Bramsl=F8w Oticon A/S Strandvejen 58 Hellerup DK-2900 Denmark +45 39 13 85 42 Direct +45 39 17 71 00 Main = <http://www.oticon.com/eprise/main/Oticon/_images/z_other/logo_sig.gif> = =20 ------_=_NextPart_001_01C4F824.9F71C140 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1479" name=3DGENERATOR></HEAD> <BODY> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2>Dear=20 List</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2>As = already=20 suggested, the music transmission index is another term for an=20 objective sound quality metric, such as the PESQ and PEAQ. = This is a=20 very interesting topic where quite some progress has been made within = ITU for=20 standardized metrics. These metrics are usually relative to = 'perfect' as=20 they require a reference signal, i.e. the original source signal. = This can=20 easily be obtained when the device under investigation is a codec, a=20 transmission line or similar, but in other cases a reference is not=20 available. Examples are loudspeakers (there is no perfect = acoustical=20 transducer) and hearing aids (there are deliberate modifications to the = signal). A few measures have been developed without reference, = one being=20 my Ph.D. thesis (surprise:-), which was an investigation on the = feasibility of=20 an objective measure for estimation of reproduced sound quality in = hearing=20 aids. Both normal-hearing and hearing-impaired listeners were=20 modeled.</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2>I = have just=20 published a summary paper on my thesis in the recent issue of Acta=20 Acustica:</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005>L. Bramsl=F8w (2004): An = Objective Estimate of=20 the Perceived Quality of Reproduced Sound in Normal and Impaired = Hearing, Acta=20 Acustica 90(6), 1007 - 1018</SPAN></DIV><SPAN = class=3D240405620-11012005> <DIV><FONT face=3DArial size=3D2></FONT> </DIV></SPAN> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2>This = issue has a=20 thematic section based on the 2003 ISCA workshop on 'Auditory = Quality of=20 Systems' and contains several interesting papers that are good starting = points=20 for an overview of sound quality measures. = See:</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2><A=20 href=3D"http://www.eaa-fenestra.org/Products/ActaAcustica/CurrentIssue/c= urrent_issue.pdf">http://www.eaa-fenestra.org/Products/ActaAcustica/Curr= entIssue/current_issue.pdf</A></FONT></SPAN></DIV></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2>My = thesis (3 out of=20 4 reports) is available here:</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial = size=3D2>Objective Scaling of=20 Sound Quality for Normal-Hearing and Hearing-Impaired=20 Listeners :</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2><A=20 href=3D"http://www.dat.dtu.dk/docs/LA_report_54.pdf">http://www.dat.dtu.= dk/docs/LA_report_54.pdf</A></FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2>A = neural network=20 model for prediction of sound quality:</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2><A=20 href=3D"http://www.dat.dtu.dk/docs/LA_report_53.pdf">http://www.dat.dtu.= dk/docs/LA_report_53.pdf</A></FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2>An = auditory model=20 with hearing loss:</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2><A=20 href=3D"http://www.dat.dtu.dk/docs/LA_report_52.pdf">http://www.dat.dtu.= dk/docs/LA_report_52.pdf</A></FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2>I = hope this can be=20 of help.</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2>Regards,</FONT></SPAN></DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial=20 size=3D2></FONT></SPAN> </DIV> <DIV><SPAN class=3D240405620-11012005><FONT face=3DArial size=3D2>Lars=20 Bramsl=F8w</FONT></SPAN></DIV> <DIV> </DIV> <DIV align=3Dleft> <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D360 align=3Dleft = border=3D0> <TBODY> <TR> <TD colSpan=3D2 height=3D2><IMG=20 = src=3D"http://www.oticon.com/eprise/main/Oticon/_images/z_other/line_sig= .gif"></TD></TR> <TR> <TD colSpan=3D2 height=3D8><FONT face=3DArial = size=3D2></FONT></TD></TR> <TR> <TD width=3D200> <DIV align=3Dleft> <P><FONT size=3D2><FONT face=3DVerdana><FONT = color=3D#0000ff><EM>Lars=20 Bramsl=F8w</EM><BR></FONT><BR>Oticon A/S<BR>Strandvejen = 58<BR>Hellerup=20 DK-2900<BR>Denmark<BR><BR>+45 39 13 <FONT=20 color=3D#0000ff>85 42</FONT> Direct<BR>+45 39 17 71 00=20 Main<BR></FONT></FONT></P></DIV></TD> <TD vAlign=3Dtop width=3D160> <DIV align=3Dright><IMG=20 = src=3D"http://www.oticon.com/eprise/main/Oticon/_images/z_other/logo_sig= .gif"></DIV></TD></TR></TBODY></TABLE></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV></BODY></HTML> ------_=_NextPart_001_01C4F824.9F71C140-- ------_=_NextPart_000_01C4F824.9F71C140 Content-Type: image/gif; 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