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Matt L.
Matt L.
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I notice two problems in your code:

  • at $f=500\,\text{kHz}$ you require a phase delay of $107$ samples, but your filter length is only $50$ taps; you can't have a delay that's greater than the filter length of an FIR filter.
  • it looks like you normalize all frequencies by the sampling frequency; however, in Matlab a normalized frequency $f=1$ corresponds to the Nyquist frequency, i.e., $f_s/2$, not to $f_s$.

I notice two problems in your code:

  • at $f=500\,\text{kHz}$ you require a phase delay of $107$ samples, but your filter length is only $50$ taps; you can't have a delay that's greater than the filter length.
  • it looks like you normalize all frequencies by the sampling frequency; however, in Matlab a normalized frequency $f=1$ corresponds to the Nyquist frequency, i.e., $f_s/2$, not to $f_s$.

I notice two problems in your code:

  • at $f=500\,\text{kHz}$ you require a phase delay of $107$ samples, but your filter length is only $50$ taps; you can't have a delay that's greater than the filter length of an FIR filter.
  • it looks like you normalize all frequencies by the sampling frequency; however, in Matlab a normalized frequency $f=1$ corresponds to the Nyquist frequency, i.e., $f_s/2$, not to $f_s$.
Source Link
Matt L.
Matt L.
  • 94.8k
  • 10
  • 85
  • 190

I notice two problems in your code:

  • at $f=500\,\text{kHz}$ you require a phase delay of $107$ samples, but your filter length is only $50$ taps; you can't have a delay that's greater than the filter length.
  • it looks like you normalize all frequencies by the sampling frequency; however, in Matlab a normalized frequency $f=1$ corresponds to the Nyquist frequency, i.e., $f_s/2$, not to $f_s$.