Difference between $\tt freqz()$ and $\tt plot(abs(fft()))$ in MATLAB

1. Why Freqz () function is used in Matlab?
2. How to use freqs in matlab?
3. What is the frequency response?
4. How to plot frequency response in octave?

Why Freqz () function is used in Matlab?

freqz determines the transfer function from the (real or complex) numerator and denominator polynomials you specify and returns the complex frequency response, H(e^jω), of a digital filter. The frequency response is evaluated at sample points determined by the syntax that you use.

How to use freqs in matlab?

h = freqs( b , a , w ) returns the complex frequency response of the analog filter specified by the coefficient vectors b and a , evaluated at the angular frequencies w . [ h , wout ] = freqs( b , a , n ) uses n frequency points to compute h and returns the corresponding angular frequencies in wout .

What is the frequency response?

A frequency response describes the steady-state response of a system to sinusoidal inputs of varying frequencies and lets control engineers analyze and design control systems in the frequency domain. To understand why the frequency domain is important consider an acoustic guitar.

How to plot frequency response in octave?

In order to calculate it on MATLAB / Octave you can do the following: % Assuming Impulse Response is given by 'vImpulseResponse' vFreqResponse = fft(vImpulseResponse); figure(); plot(abs(vFreqResponse)); Enjoy. Save this answer.