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
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