crosster.blogg.se - Matlab help freqz

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If you need help debugging, you must include: abs(h) is the magnitude responseĮdit : Does wn=0.34 corresponds to 42.Welcome to LearnProgramming! New? READ ME FIRST! Posting guidelines Frequently asked questions Subreddit rules Message the moderators Asking debugging questions Plot(f,20*log10(abs(h))) % we will use 20log10() for ploting the mag. X=fir1(N,wn,ftype,kaiser(N+1,beta)) % designing the corresponding fir filter ( note that fir1 takes an even filter order so we wrote N+1) , order of the filter, filter type and betta according to the design specs.

This function will return the cuttoff freq. =kaiserord(fcuts,mags,devs,fs) % using kaiser window for designing the fir filter. Mags= % The required filter amplitude in these bands (Absolute value not in dB)ĭevs= % Passband and stopband ripples (Absolute value not in dB) So what is wrong with my code? Here is the code (with the required filter specifications): fs=250 įcuts= % passband and stopband frequencies My question is that when I plot the amplitude response, the -3dB point occurs at frequency above 100 Hz, which means that the cutoff frequency is not equal to 42.5 Hz.

Doing this, the returned wn is equal to 0.34 (returned by kaiserord()), which when I convert it to Hertz it gives me 42.5 Hz as required. I need to plot the filter's magnitude and phase responses with the x-axis as frequency in Hertz instead of plotting them with the normalized angular frequency. I am designing an FIR filter in Matlab using a Kaiser window.