Subject: Re: temporal resolution From: Regis Rossi Alves Faria <regis(at)LSI.USP.BR> Date: Tue, 11 Mar 2003 14:00:32 -0300This is a multi-part message in MIME format. --------------1066F0873E70D40466BE4AAE Content-Type: multipart/alternative; boundary="------------958354A6997A75454BBEE299" --------------958354A6997A75454BBEE299 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hello, auditory system is much more sensitive to modulations of any order than the visual system is; during my studies with wavelet decomposition/reconstruction of audio/musical signals, it became very clear that spectral processing done in some subbands produces several modulations in the audio signal, which are sensed as effects in the sound; I wonder what kind of effects different delays applied to subbands would cause to the sound, causing the reconstruction to have easily recognized distortion/modulations even when delays are very short. regards, Regis David Dorran wrote: > Hi, I've posted this message to the music-dsp list so apologies to > anyone who recieves it twice (should have posted it here in the first > place since its more appropriate). Consider the case where an audio > signal is filtered into subbands and each subband is passed through a > delay (of different duration for each subband) before recombination of > subbands to produce a new signal. What would be the maximum > permissible difference between the maximum and minimum delays so that > the new signal is perceptually equivalent to the > original? Regards, Dave. > > > -- > This message has been scanned for viruses by the > DIT Computer Centre MailScanner Service, > and is believed to be clean. --------------958354A6997A75454BBEE299 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit <!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <body bgcolor="#FFFFFF"> <br>Hello, <p>auditory system is much more sensitive to modulations of any order than the visual system is; <br>during my studies with wavelet decomposition/reconstruction of audio/musical signals, it became very clear that spectral processing done in some <br>subbands produces several modulations in the audio signal, which are sensed as effects in the sound; <br>I wonder what kind of effects different delays applied to subbands would cause to the sound, causing the reconstruction to have easily recognized <br>distortion/modulations even when delays are very short. <p>regards, <br>Regis <br> <p>David Dorran wrote: <blockquote TYPE=CITE><style></style> <font face="Arial"><font size=-1>Hi,</font></font> <font face="Arial"><font size=-1>I've posted this message to the music-dsp list so apologies to anyone who recieves it twice (should have posted it here in the first place since its more appropriate).</font></font> Consider the case where an audio signal is filtered into subbands and each subband is passed through a delay (of different duration for each subband) before recombination of subbands to produce a new signal. What would be the maximum permissible difference between the maximum and minimum delays so that the new signal is perceptually equivalent to the original? <font face="Arial"><font size=-1>Regards,</font></font> Dave. <p><br>-- <br>This message has been scanned for viruses by the <br><b><a href="http://ditweb.dit.ie/admin/ext_affairs/comp_serv/index.html">DIT Computer Centre MailScanner Service</a></b>, <br>and is believed to be clean.</blockquote> </body> </html> --------------958354A6997A75454BBEE299-- --------------1066F0873E70D40466BE4AAE Content-Type: text/x-vcard; charset=us-ascii; name="regis.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Regis Rossi Alves Faria Content-Disposition: attachment; filename="regis.vcf" begin:vcard n:Faria;Regis tel;fax:+55-11-3091-5664 tel;work:+55-11-3091-5676 x-mozilla-html:FALSE url:http://www.lsi.usp.br/ org:LSI - University of São Paulo;Electronic Systems Dept. version:2.1 email;internet:regis(at)lsi.usp.br title:R&D Projects Coordination adr;quoted-printable:;;Av. Prof. Luciano Gualberto, 158 tv.3=0D=0ACidade Universit=E1ria;São Paulo;SP;05508-900;Brazil fn:Regis Rossi A. Faria end:vcard --------------1066F0873E70D40466BE4AAE--