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Dear Members
I am Ganesh, working on Echo Cancellation for VoIP networks. While doing my simulations with a few different algorithms like LMS and NLMS, i didnt get a very satisfactory result. But when i used Leaky NLMS it works perfectly. Does anyone know why it works very well for Leaky NLMS? If you'll know of any useful links also, please let me know. Many Thanks Hope to hear from you'll soon. Regards Ganesh |
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Leaky NLMS
Started by ●September 22, 2004
Reply by ●September 23, 20042004-09-23
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Ganesh, There is a lot of theory behind that, but practically the leaky LMS has a few advantages - it forces the filter taps to keep learning in all of the frequency bands constantly. So if the input signal doesn't excite all of the frequency components (zero-value eigenvalues of the autocorrelation matrix), the filter taps are not going to converge, the filter is not going to converge to a unique solution... That's why the leakage is used to keep the taps changing in all of the frequency components, and it's changing them towards zero - preventing the noise from building up. I've heard that it also helps with the finite precision math. Vlad -----Original Message----- From: ganesa1234 [mailto:] Sent: Tuesday, September 21, 2004 11:02 PM To: Subject: [echocancel] Leaky NLMS Dear Members I am Ganesh, working on Echo Cancellation for VoIP networks. While doing my simulations with a few different algorithms like LMS and NLMS, i didnt get a very satisfactory result. But when i used Leaky NLMS it works perfectly. Does anyone know why it works very well for Leaky NLMS? If you'll know of any useful links also, please let me know. Many Thanks Hope to hear from you'll soon. Regards Ganesh ------------------------ Yahoo! Groups Sponsor --------------------~--> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar. Now with Pop-Up Blocker. Get it for free! http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/sVPplB/TM --------------------------------~-> _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/echocancel Other DSP-Related Groups: http://www.dsprelated.com Yahoo! Groups Links |
Reply by ●September 24, 20042004-09-24
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What is the code you are using? btw, NLMS shall works somehow if you scale energy in an appropriate manner. Have fun, michael. --- In , "ganesa1234" <ganesa1234@y...> wrote: > Dear Members > I am Ganesh, working on Echo Cancellation for VoIP networks. > While doing my simulations with a few different algorithms like LMS > and NLMS, i didnt get a very satisfactory result. > > But when i used Leaky NLMS it works perfectly. Does anyone > know why it works very well for Leaky NLMS? If you'll know of any > useful links also, please let me know. > > Many Thanks > Hope to hear from you'll soon. > > Regards > > Ganesh |
