Subject: Re: perceptual audio codecs From: James Johnston <audioskeptic@xxxxxxxx> Date: Wed, 9 Apr 2014 13:04:23 -0700 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--047d7bf0f4fc5ca52804f6a19b39 Content-Type: text/plain; charset=ISO-8859-1 Testing perceptual codecs with software is a bad idea. Any code that does so is going to have to attempt a universal perceptual model, or take one of the models from MPEG or other standards, in which case the results are going to be biased. Perceptual codecs should be tested strictly via listening tests. SQAM, etc, are not very useful at all, and there isn't a publically available model I know of that suffices for handling BMLD. jj (who invented a lot of that stff, fwiw) On Wed, Apr 9, 2014 at 2:57 AM, JesterN Alberto Novello <jestern77@xxxxxxxx>wrote: > Dear List, > I'm reviewing the state of the art of Perceptual Audio Codecs. For this > reason I tried collecting some available MATLAB codecs for testing quality > (in perceptual experiments), compression ratio and speed. I realised there > is not so much code available out there and mostly quite old (probably for > commercial copyright reasons). So I thought of asking here if any of you > has some links to suggest about some available code (C, C++ also possible) > possibly less than a decade old. > Thanks a lot > Alberto > > || | | ||| | || || | ||||| || | || | ||| | ||||| | | ||| | |||| | || > |||| > > ALBERTO NOVELLO / JesterN > site: jestern.com > shop: jestern.bandcamp.com > audio: soundcloud.com/jestern > video: vimeo.com/jestern > > || | | ||| | || || | ||||| || | || | ||| | ||||| | | ||| | |||| | || > |||| > > If for any reason you wish not to receive any more messages from this > email, please send an email with REMOVE as subject. I'm sorry for the > inconvenience. > Se per qualsiasi ragione non desideri ricevere piu' messaggi da questo > indirizzo, mandami un messaggio con REMOVE nel soggetto. Mi scuso per il > disturbo. > -- James D. (jj) Johnston Independent Audio and Electroacoustics Consultant --047d7bf0f4fc5ca52804f6a19b39 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div>Testing perceptual codecs with software is a bad idea= .=A0 Any code that does so is going to have to attempt a universal perceptu= al model, or take one of the models from MPEG or other standards, in which = case the results are going to be biased.</div> <div><br></div><div>Perceptual codecs should be tested strictly via listeni= ng tests.</div><div><br></div><div>SQAM, etc, are not very useful at all, a= nd there isn't a publically available model I know of that suffices for= handling BMLD.</div> <div><br></div><div>jj (who invented a lot of that stff, fwiw)</div></div><= div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed, Apr 9,= 2014 at 2:57 AM, JesterN Alberto Novello <span dir=3D"ltr"><<a href=3D"= mailto:jestern77@xxxxxxxx" target=3D"_blank">jestern77@xxxxxxxx</a>></sp= an> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex"><div><div style=3D"font-family:HelveticaNeue= ,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:10pt"><d= iv> <span>Dear List,</span></div><div style=3D"font-family:HelveticaNeue,"= Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif;f= ont-size:13px;font-style:normal;background-color:transparent"><span>I'm= reviewing the state of the art of Perceptual Audio Codecs. For this reason= I tried collecting some available MATLAB codecs for testing quality (in pe= rceptual experiments), compression ratio and speed. I realised there is not= so much code available out there and mostly quite old (probably for commer= cial copyright reasons). So I thought of asking here if any of you has some= links to suggest about some available code (C, C++ also possible) possibly= less than a decade old.</span></div> <div style=3D"font-family:HelveticaNeue,"Helvetica Neue",Helvetic= a,Arial,"Lucida Grande",sans-serif;font-size:13px;font-style:norm= al;background-color:transparent"><span>Thanks a lot</span></div><div style= =3D"font-family:HelveticaNeue,"Helvetica Neue",Helvetica,Arial,&q= uot;Lucida Grande",sans-serif;font-size:13px;font-style:normal;backgro= und-color:transparent"> <span>Alberto</span></div><div></div><div>=A0</div><div style=3D"font-famil= y:arial,helvetica,clean,sans-serif;font-style:normal;background-color:trans= parent"><span style=3D"font:16px/normal Helvetica;text-transform:none;text-= indent:0px;letter-spacing:normal;word-spacing:0px;white-space:normal;border= -collapse:separate"><font face=3D"Arial"><font color=3D"#999999"><font>|| |= | ||| |=A0 ||=A0 || | ||||| || | || | ||| | ||||| | | ||| | |||| |=A0 || ||||</font><= /font></font></span><span style=3D"font:16px/normal Helvetica;text-transfor= m:none;text-indent:0px;letter-spacing:normal;word-spacing:0px;white-space:n= ormal;border-collapse:separate"><font face=3D"Arial"><font color=3D"#999999= "><font><font><br> <span style=3D"font-size:10px">=A0</span><br></font></font></font></font></= span><span style=3D"font-weight:bold">ALBERTO NOVELLO / JesterN</span><br>s= ite: <span style=3D"font-weight:bold"><a href=3D"http://jestern.com" target= =3D"_blank">jestern.com</a></span><br> shop: <span style=3D"font-weight:bold"><a href=3D"http://jestern.bandcamp.c= om" target=3D"_blank">jestern.bandcamp.com</a></span><br>audio: <span style= =3D"font-weight:bold"><a href=3D"http://soundcloud.com/jestern" target=3D"_= blank">soundcloud.com/jestern</a></span><br> video: <span style=3D"font-weight:bold"><a href=3D"http://vimeo.com/jestern= " target=3D"_blank">vimeo.com/jestern</a></span><span style=3D"font:16px/no= rmal Helvetica;text-transform:none;text-indent:0px;letter-spacing:normal;wo= rd-spacing:0px;white-space:normal;border-collapse:separate"><font face=3D"A= rial"><font color=3D"#999999"><span style=3D"font:16px/normal Helvetica;tex= t-transform:none;text-indent:0px;letter-spacing:normal;word-spacing:0px;whi= te-space:normal;border-collapse:separate"><font face=3D"Arial"><font color= =3D"#999999"><font><font><font><span style=3D"font:16px/normal Helvetica;te= xt-transform:none;text-indent:0px;letter-spacing:normal;word-spacing:0px;wh= ite-space:normal;border-collapse:separate"><font face=3D"Arial"><font color= =3D"#999999"><font><br> <span style=3D"font-size:10px">=A0</span><br>|| | | ||| |=A0 ||=A0 || | |||= || || | || | ||| | ||||| | | ||| | |||| |=A0 || ||||</font></font></font></= span><span style=3D"font:16px/normal Helvetica;text-transform:none;text-ind= ent:0px;letter-spacing:normal;word-spacing:0px;white-space:normal;border-co= llapse:separate"></span></font></font></font></font></font></span></font></= font></span><span style=3D"font:16px/normal Helvetica;text-transform:none;t= ext-indent:0px;letter-spacing:normal;word-spacing:0px;white-space:normal;bo= rder-collapse:separate"><font face=3D"Arial"><font color=3D"#aaaaaa"><br> <br></font></font></span></div><div style=3D"font-family:arial,helvetica,cl= ean,sans-serif;font-style:normal;background-color:transparent"><span style= =3D"font-size:10px">If for any reason you wish not to receive any more mess= ages from this email, please send an email with REMOVE as subject. I'm = sorry for the inconvenience. <br> </span></div><div style=3D"font-family:arial,helvetica,clean,sans-serif;fon= t-size:13px;font-style:normal;background-color:transparent"><span style=3D"= font-size:x-small">Se per qualsiasi ragione non desideri ricevere piu' = messaggi da questo indirizzo, mandami un messaggio con REMOVE nel soggetto. Mi scuso per il disturbo.</s= pan><br></div></div></div></blockquote></div><br><br clear=3D"all"><br>-- <= br><div>James D. (jj) Johnston</div><div>Independent Audio and Electroacous= tics Consultant</div> </div> --047d7bf0f4fc5ca52804f6a19b39--