Subject: Re: Audio Time and/or Level Alignment Algorithm From: Junyong You <junyong.you@xxxxxxxx> Date: Thu, 3 Jul 2008 12:19:46 +0300 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>This is a multi-part message in MIME format. ------=_NextPart_000_012C_01C8DD07.14DA2790 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi John and all, In fact, I am also looking for the time alignment of two samples, one is = the original, and another is decoded. My problem is to estimate the time = delay caused by audio coding. I try a classifical estimation method, which makes use of envelope based = cross-correlation function. That means, the envelopes of two samples are = computed firstly, and then calculate the cross correlation function of = these two envelopes, and then select the time length corresponding to = the maximal correlation as the delay. I hope this method will help you, and if anyone has better approaches, = please let me know, thank you very much. BR, Junyong You TUT, Finland ----- Original Message -----=20 From: John Spencer=20 To: AUDITORY@xxxxxxxx=20 Sent: Wednesday, July 02, 2008 2:11 PM Subject: [AUDITORY] Audio Time and/or Level Alignment Algorithm Hello List, I am looking for advice and help with a problem. I have 2 audio signals each recorded in different environments but = both are the same length. I need to align them the best I can or align = at leats one of them to match the other. They need to be aligned time = wise and level wise if possible. Any advice appreciated, thanks. John Spencer=20 -------------------------------------------------------------------------= ----- Walla! Mail - Get your free unlimited mail today ------=_NextPart_000_012C_01C8DD07.14DA2790 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8"> <META content=3D"MSHTML 6.00.6000.16674" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Hi John and all,</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>In fact, I am also looking for the time = alignment=20 of two samples, one is the original, and another is decoded. My problem = is to=20 estimate the time delay caused by audio coding.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I try a classifical estimation method, = which makes=20 use of envelope based cross-correlation function. That means, the = envelopes of=20 two samples are computed firstly, and then calculate the cross = correlation=20 function of these two envelopes, and then select the time length = corresponding=20 to the maximal correlation as the delay.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I hope this method will help you, and = if anyone has=20 better approaches, please let me know, thank you very much.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>BR, Junyong You</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>TUT, Finland</FONT></DIV> <BLOCKQUOTE dir=3Dltr=20 style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV> <DIV=20 style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B>=20 <A title=3Djohnspencer@xxxxxxxx = href=3D"mailto:johnspencer@xxxxxxxx">John=20 Spencer</A> </DIV> <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A = title=3DAUDITORY@xxxxxxxx=20 href=3D"mailto:AUDITORY@xxxxxxxx">AUDITORY@xxxxxxxx</A> = </DIV> <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, July 02, 2008 = 2:11=20 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [AUDITORY] Audio Time = and/or=20 Level Alignment Algorithm</DIV> <DIV><BR></DIV> <DIV dir=3Dltr><FONT face=3DArial size=3D3> <P><BR>Hello List,</P> <P> </P> <P>I am looking for advice and help with a problem.</P> <P> </P> <P>I have 2 audio signals each recorded in different environments but = both are=20 the same length. I need to align them the best I can or align at = leats=20 one of them to match the other. They need to be aligned time wise and = level=20 wise if possible. Any advice appreciated, thanks.</P> <P> </P> <P>John Spencer <BR><BR><BR></P></FONT></DIV> <HR> <DIV style=3D"COLOR: black; BACKGROUND-COLOR: white">Walla! Mail - <A=20 style=3D"COLOR: blue" href=3D"http://www.walla.com">Get your free = unlimited mail=20 today</A></DIV></BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_012C_01C8DD07.14DA2790--