MATLAB: What is the cut off frequency

cut-off frequency

what is the cut off frequency of low pass and high pass filter and how i calculate it with code in matlab?

Best Answer

This is basic signal processing. The cutoff frequency is characteristically defined as the half-power point of the filter passband. It is generally considered to be the 6-dB-down point, as the result of calculations similar to these:
amplitude = 0.5;
HPP = 20*log10(amplitude)
HPP = 10*log10(amplitude^2)
HPP =
    -6.0206
HPP =
    -6.0206
So if the peak of the passband is 1, then the frequency corresponding to the half-power-point is the cutof frequency. It is the frequency at which only half the power of the signal being filtered is transmitted by the filter.
Related Question