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Digital Signal Processing: How can I plot the frequency responses of FIR band-pass filters using MATLAB?

  • Using both the windowing method and firpm, design a FIR band-pass filter with a transition width of 5 kHz for a signal sampled at Fs = 200 kHz. Frequencies from 40 kHz to 70 kHz should have a gain of at least -0.05 dB. At the output of the filter, an unwanted signal at 80 kHz x(n) = 20cos((4Ï€/5)*n) should be attenuated to have an amplitude less than 0.002. (Hint: δs = .002/20 ). Plot the frequency responses of both filters with MATLAB.

  • Answer:

    Sounds like your homework. I don't know about firpm, but using fdatool you should be able to design the window FIR filter one using the gui. Then there's an option to plot the frequency response above.

Prasad Tendolkar at Quora Visit the source

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