Path: news.mathworks.com!not-for-mail From: <HIDDEN> Newsgroups: comp.soft-sys.matlab Subject: psychoacoustical Masking. Date: Fri, 26 Mar 2010 13:42:04 +0000 (UTC) Organization: Concordia Lines: 10 Message-ID: <hoidjc$t5q$1@fred.mathworks.com> Reply-To: <HIDDEN> NNTP-Posting-Host: webapp-02-blr.mathworks.com Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Trace: fred.mathworks.com 1269610924 29882 172.30.248.37 (26 Mar 2010 13:42:04 GMT) X-Complaints-To: news@mathworks.com NNTP-Posting-Date: Fri, 26 Mar 2010 13:42:04 +0000 (UTC) X-Newsreader: MATLAB Central Newsreader 1057560 Xref: news.mathworks.com comp.soft-sys.matlab:620649 I am trying to make those frequencies of my speech signal combined by white gaussian noise inaudible .First,I mapped from frequency to Bark scale by z=13*atan((.76*T)/1000)+3.5*atan((T/7500).^2); second, defined energy per critical band E.then obtained the spread masking across CBR which is defined as C=conv(E,B); here B is basiilar membrane spreading function B(dB)=B=15.81+7.5*(z+.474)-17.5*sqrt(1+(z+.474).^2); finally,masking threshold function is calculated by MASK=((10.^(P-Q))./N); where : P=(log10(C)); Q=(Ofset/10); My problem is reffered to as Matrix mistmatch between P and Q in matlab.that sounds reasonable because if you assume E and B by size L.their convolution C should be at most 2*L-1 and at least L.This is due to the Convolution property,considering Ofset=delta*(14.5+z)+(1-delta)*5.5; Q seems to be a matrix by size L.I really need your help to find out how these matixes fit together dimensionally to calculate MASK. Regards, Mohammad