Jerry wrote > I just submitted a bug report for a big-ass bug in freqz: > > > If h is an FIR impulse response, then > freqz(h); > performs as advertised. However, > freqz(h, N); > where N is any number including the default 512 returns incorrect > magnitude results.
You probably got what you needed, just a little more clarification: If you look at help for freqz you'll see it's designed to give the frequency response of IIR filters. Your particular usage freqz(h, N) tells freqz that you want the frequency response of an IIR filter with transfer function numerator of h and denominator of N. But freqz can also be used for FIR filters, just have to remember that the denominator of an FIR filter's transfer function is 1, i.e. it's a simple polynomial with no denominator term. So, as the previous respondent says, make your second input argument a 1 and you're on your way. The explanation for why it worked when you specified freqz(h) is contained in the help: "If A is omitted, the denominator is assumed to be 1 (this corresponds to a simple FIR filter)." -- View this message in context: http://octave.1599824.n4.nabble.com/Bug-in-freqz-tp4633628p4644798.html Sent from the Octave - Dev mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://ad.doubleclick.net/clk;258768047;13503038;j? http://info.appdynamics.com/FreeJavaPerformanceDownload.html _______________________________________________ Octave-dev mailing list Octave-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/octave-dev
