MATLAB: Convert a signal in a particular frequency range

signal processing

The attached file is an EMG signal. How to know the frequency range of that signal? Its sampling rate is 2000 Hz. I wanted to convert the signal in the frequency range 20 – 450 Hz. How to do it?

Best Answer

See my Answer to your other Question for the details.
This filter will be:
Fs = 2000;                                              % Sampling Frequency (Hz)
Fn = Fs/2;                                              % Nyquist Frequency (Hz)
Wp = [20 450]/Fn;                                       % Passband Frequencies (Normalised)
Ws = [19 455]/Fn;                                       % Stopband Frequencies (Normalised)
Rp = 10;                                                % Passband Ripple (dB)
Rs = 50;                                                % Stopband Ripple (dB)
[n,Ws] = cheb2ord(Wp,Ws,Rp,Rs);                         % Filter Order
[z,p,k] = cheby2(n,Rs,Ws);                              % Filter Design
[sosbp,gbp] = zp2sos(z,p,k);                            % Convert To Second-Order-Section For Stability
NOTE — Make appropriate changes to my other code for your EMG signal.
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