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Hi, I think these will work. for three points ( z(n-2) -4*z(n-1)+3*(n) )/(2*h) for four points ( -2*z(n-3) + 9*z(n-2) -18*z(n-1) +11*z(n) )/(6*h) for five points (6*z(n-4) -32*z(n-3)+72*z(n-2)-96*z(n-1)+50*z(n))/(24*h) hopefully these work allright. At 07:44 22/02/2002 +0000, raffaelemalutta wrote: >Hallo evedybody. > >I'm working with Simulink (discrete time) and I've to derivate a >noisy signal. > >What is the best way to do this? > >Anyone could suggest me a proper choise for cefficients of a >derivative filter? >(for example: [z(n) + 3z(n-1) -3z(n-2) -z(n-3)]/(6*h)) >Thanks a lot >Bye >Raffaele > > >_____________________________________ >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/matlab > >More DSP-Related Groups: http://www.dsprelated.com/groups.php3 > >">http://docs.yahoo.com/info/terms/ |