MATLAB: How is FIR filtering used

fir

Hello!

I think i have a simple question.

Is FIR used only for removing noise or can it also be used for tuning in on a specific frequency. To me it seems that it would be very good at removing noise since it is a moving average but I don't see how it could tune out unwanted frequencies as it sais it can be used in a video I watched.

thanks!

Best Answer

FIR filters can be very effective at removing noise. See specifically this Comment in How to filtre an audio signal with low-pass filtre for one example of using a low-pass FIR filter with two specific ‘notch’ frequencies to eliminate specific noise frequencies.

Related Solutions

MATLAB: FIR filter

   b = firls(30,[0 .1 .2 .5]*2,[1 1 0 0]);
   fvtool(b);

Obviously you have to specify more than the order. You have to give your frequencies and the amplitudes you wish at those frequencies. I have just used some values above.

Please read the reference page for firls.

Also, I'm assuming that you mean this filter and not the LMS adaptive FIR filter.

MATLAB: How to design FIR lowpass filter with cutoff frequency, fc1 = 20 Hz and FIR bandpass filter with cutoff frequency fc2 = 10 Hz and fc3 = 35 Hz.

Déjà vu

how to design IIR highpass filter with cutoff frequency of 20Hz and FIR bandpass filter with cutoff frequency of 10Hz and 15Hz?

Make the appropriate changes to get the cascaded filter you want.

Best Answer

Related Solutions

MATLAB: FIR filter

MATLAB: How to design FIR lowpass filter with cutoff frequency, fc1 = 20 Hz and FIR bandpass filter with cutoff frequency fc2 = 10 Hz and fc3 = 35 Hz.

Related Question