Noise Equivalent Bandwith of IIR and FIR Filters? How do you calculate the noise equivalent bandwidth for an IIR or FIR filter?
Hm, isn't it the same as for any filter?

$$
B_\text{eq} = \frac{1}{|H(e^{j\omega_0})|^2} \int_0^\infty |H(e^{j\omega})|^2 d\omega
$$

where $H(e^{j\omega})$ is the frequency response, and $\omega_0$ is the max-abs frequency. For FIR filters, you can just use e.g. freqz in MATLAB/Octave. For IIR filters, you'd have to do analysis or take measurements (or see if you can get away with truncating)