Polyphase filter bank

[meiyasan]

Hello @dancazarin ,

I would like to resample my signal and apply a filter bank to my input signal. I have done some attempt of implementation on my own, but would it be possible to implement such features directly into KFR in the future ?

[dancazarin]

Hello,
As for resampling with bandpass filtering using a polyphase FIR filter to prevent aliasing,
there is a builtin feature since KFR 1, see examples/sample_rate_conversion.cpp.
It uses Kaiser window with adjustable quality (transition band width) and cutoff frequency.
Or do you need to pass custom coefficients to the polyphase filter?

[meiyasan]

May I ask the effect of this adjustable quality? I am usually not working with audio.
Additionally, I would expect lowpass not bandpass filtering to prevent aliasing.

I might actually need some flexibility and interested in passing some custom coefficients to the polyphase filter indeed.