Dear Sir,
I understand that gnuradio use FFTW to perform fast fourier transform.
In contrast, what is the library used by gnuradio to perform low-pass filtering (LPF)?
My intension is to create a custom block to perform digital downconversion (DDC).
This is to simulate a SBX daughtercard in receiving RF signal.
I guess this can be done by creating a hierarchical block which include the built-in Low Pass Filter, but I am doing this from scratch for learning purpose.
To summarize my question:
which library is used by gunradio for low pass filtering?
Could it be something like Aquila, SPUC, dspfilterscpp, etc. ?
Thank you very much.
Regards,
Activecat