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Hi I am trying to design a kaiser filter. Just for testing I set wp=0.3 and ws=0.4 to get the lowpass version of the filter. It seems changing the wp and ws does not swich between low- or highpass or the leads to exact changes of the stopband and passband regions accordingly! anyone can help me to find out where im wrong? thank a lot k In the example below the magnitude response looks like a highpass but the plot doesn't match the specifications of wp and ws!? %determine beta N%6; %fix length wp=0.8; %passband ws=0.7; %stopband trsBnd=(ws-wp)*pi; %transition band A=(N*2.285*trsBnd)+8; if A>50 beta=0.1102*(A-8.7) elseif 21<=A<P beta=0.5842*(A-21)^0.4+0.07886*(A-21) elseif A<21 beta=0 end b=kaiser(N,beta); f=(-(length(b)-1)/2:1:(length(b)-1)/2)*2/length(b); %freq. axis plot(f,log(abs(fft(b)))); %log magnitude response |