Subject: STFT vs Power Spectral in Musical recognition system ? From: Edwin Sianturi <sianturiauditory@xxxxxxxx> Date: Fri, 25 Aug 2006 07:12:59 -0700--0-1307645844-1156515179=:13758 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by torrent.cc.mcgill.ca id k7PED6jh031610 Hello, I am just a master student, doing my internship. Right now, I am building= a musical instrument recognition system. I have read several papers on i= t, and I am just curious: All the papers/journals that I have read use the STFT, a.k.a the |X(t,f)|= of a signal x(t), in order to extract several (spectral) features to be = used as the input to the recognition system. What are the reasons behind using the |X(t,f)| instead of using the "powe= r spectral" |X(t,f)|^2 ?=20 (technically speaking, a power spectral density is the expectation of |X(= f)|^2, i.e. E(|X(f)|^2) ) Thanks in advance, Edwin SIANTURI =09 --------------------------------- Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ co= untries) for 2=A2/min or less. --0-1307645844-1156515179=:13758 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by torrent.cc.mcgill.ca id k7PED6jh031610 Hello,<br><br>I am just a master student, doing my internship. Right now,= I am building a musical instrument recognition system. I have read sever= al papers on it, and I am just curious:<br><br>All the papers/journals th= at I have read use the STFT, a.k.a the |X(t,f)| of a signal x(t), in orde= r to extract several (spectral) features to be used as the input to the r= ecognition system.<br><br>What are the reasons behind using the |X(t,f)| = instead of using the "power spectral" |X(t,f)|^2 ? <br>(technically speak= ing, a power spectral density is the expectation of |X(f)|^2, i.e. E(|X(f= )|^2) )<br><br>Thanks in advance,<br><br>Edwin SIANTURI<br><p>  <hr size=3D1>Yahoo! Messenger with Voice. <a href=3D"http://us.rd.yahoo= .com/mail_us/taglines/postman1/*http://us.rd.yahoo.com/evt=3D39663/*http:= //voice.yahoo.com">Make PC-to-Phone Calls</a> to the US (and 30+ countrie= s) for 2=A2/min or less. --0-1307645844-1156515179=:13758--