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mmoctar (16) 6 Articles, 10 Replies, 16 Points

Since 6/11/2012 8:15:34 PM, mmoctar has written 6 articles and participated in 10 conversations.
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mmoctar

mmoctar's articles:
 Items(6) /1 wav file 5 52 (7/3/2009 1:35:11 PM) comp.dspHi all, I'm working on acoustic echo cancellation, my question is; When I test an algorithm like LMS or NLMS should I change the scale of my wave signal? As pcm file are Q15 between 1 and -1, do I need to multi...mmoctar MUSIC 3 45 (6/15/2009 1:26:06 PM) comp.dspIs MUSIC algorithm interesting to estimate (amplitude and frequency) of sinusoids corrupted by noise? Others propositions are welcome. Thank you in advance... Moctar ...mmoctar DCT-lms 0 43 (3/30/2009 12:43:58 PM) comp.dspHi all, Is there a best way for eigenvalue estimation in speech case for DCT-lms? I test my algorithm with power normalization as proposed by Farhang, Ali H Sayed and Haykin, my convergence still under the NLMS...mmoctar estimation #2 1 61 (3/5/2009 4:45:33 PM) comp.dspDear all, My question is about estimation I found in many algorithms. x(n)=b*x(n)+(1-b)*x(n-1);-----> (DCT and DFT LMS, power normalized-NLMS) and sometimes its: x(n)=b1*x(n)+(1-b1)*x(n-1) if x(n)>x(n-1); x(n)=...mmoctar Nlms, DFTlms, DCTlms 0 51 (12/17/2008 4:30:30 PM) comp.dspDFT: Tk,m=1/sqrt(M)*exp((-j*2*pi*m*k)/M) DCT: T*k,m =β(k)*cos(k*(2*m+1)*pi/M) β(0)=1/sqrt(M) et β(k)=sqrt(2/M) Algo X’i= [x(i)……….x(i-M+1)]*T ldk(i)=b*lbk(i-1)+(1-b)*norm(x’i(k) )^2 Di=diag(ldk) e(i)=d(i)-x’i*...mmoctar LMS convergence 2 55 (11/28/2008 1:00:14 PM) comp.dspI built an LMS filter, and I have better convergence when I use an alternate signal as input, than a DC(all x(n)>0) one. Did someone have an explanation about it? thanks ...mmoctar

mmoctar's replies:
 Items(8) /1 echo cancellation by solving linear equations 12 44 (12/8/2008 3:46:06 PM) comp.dspOk , assume echo tail length is less that or equal to 64 sample. Is it possible to get coefficient of the adaptive filter by solving 64 linear equation? Input is known, output is known , only unknon is coeffic...pal.debabrata123 (29) zero padding once again 21 39 (2/13/2009 12:16:41 AM) comp.dspHello forum, can someone clarify for me , once again, what zero padding is good for? To my understanding the frequencies in the DFT are integer multiples of f_s /N (where f_s is the sampling frequency). ...marcoscipioni1 (38) frequency 21 45 (4/10/2009 3:13:25 AM) comp.dsp I just like to put forward a simple question which has been buggin me for a long time. What is frequency? rajesh. ...getrajeshin (120) circular convolution or matrix multiplication 6 42 (4/17/2009 11:58:32 AM) comp.dspHi, I'm currently doing project on OFDM based. I want to transmit my signal through a Rayleigh channel. assume that the received signal should be y(t)=x(t)*h(t)+n(t) or Y(f)=X(f)H(f)+N(f). I understand that in...nhusna (3) How to compute the autocorrelation matrix of a random vector in matlab? 8 45 (4/20/2009 8:35:51 AM) comp.dspI want to use matlab to compute the autocorrelaton matrix of a random vector. Here is the code I have written. Is it correct? clc; vec_num = 1000; x = zeros(8,vec_num); for i=1:vec_num x(:,i) = round(randn(...zhihang.wang (12) correlation and filtering 3 35 (4/21/2009 2:57:04 PM) comp.dspHi, I am new to DSP.I am having the input signal which consists three frequencies say 50 HZ,75 hz and 100 HZ and the sampling frequency is 500 Hz.Now I had applied LPF (low pass filter with order 800) with cut ...krishnavichu (1) wav file 5 52 (7/3/2009 1:35:11 PM) comp.dspHi all, I'm working on acoustic echo cancellation, my question is; When I test an algorithm like LMS or NLMS should I change the scale of my wave signal? As pcm file are Q15 between 1 and -1, do I need to multi...mmoctar (16) Decorrelation vs Whitening 7 39 (7/7/2009 10:50:30 PM) comp.dspTo me, whitening is takinga coloured noise signal and reproducing it's white noise input.(as Weiner has it) However, I have seen otehr definitions eg suppose we have a mixture of signals via a matrix A X=A.S ...gyansorova (941)