hydrasdr_433 deep dive 1/2
OS-PFB Channelizer: 2x oversampled analysis filterbank splits wideband IQ into M narrowband channels (M = 2, 4, 8, 16).
48 taps/branch, Kaiser window
80 dB stopband attenuation
>41 dB adjacent channel rejection
<0.1 dB passband ripple