pyeeg.utils.fir_order

pyeeg.utils.fir_order(tbw, srate, atten=60, ripples=None)

Estimate FIR Type II filter order (order will be odd).

If ripple is given will use rule:

\[N = \frac{2}{3} \log_{10}\frac{1}{10\delta_ripp\delta_att} \frac{Fs}{TBW}\]

Else:

\[N = \frac{Atten*Fs}{22*TBW} - 1\]

Parameters:

• tbw (float) – Transition bandwidth in Hertz

• srate (float) – Sampling rate (Fs) in Hertz

• atten (float (default 60.0)) – Attenuation in StopBand in dB

• ripples (float (default None, optional)) – Maximum ripples height (in relative to peak)

Returns:

order – Filter order (i.e. 1+numtaps)

Return type:

int

Notes

Rule of thumbs from here.