I'm working on a series of blocks to measure the level of white noise and attentuate it. (Yes, I know there are better ways of doing this, like a Wiener filter - my goal here is to experiment and learn.)
Model: Assume white noise is present in equal power at all frequencies. Plan: Signal --> FFT --> [Find min power val over entire freq vector] --> [Subtract that min val from all freq] --> IFFT --> Output Two questions: 1. Will this work? 2. What format does the FFT output vector use? I imagine to find the min power at any freq I need to write my own block - hopefully I can do this in Python. Code to do that in Python is trivial, but I can't find the FFT output vector format documented. Likewise for "Subtract" - I mean this as a mathematical subtraction, *not* attenuation (multiply), which would attentuate the signal just as much. So if the FFT output vector is in a logarithmic format, I need to first turn it into a linear format before subtracting. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
