> From: Richard Lamont > Date: Mon, 8 Jan 2018 20:09:23 +0000 > > I'm new to this, so my apologies if I'm being thick. I have spent > hours > trying to resolve this. > > The FM pre-emphasis and de-emphasis blocks do not appear to implement > the amplitude-frequency response I would expect - equivalent to a > simple > analog RC filter. > > Is this a known bug? (version 3.7.9)
Yes. I implemented the pre-emphasis filter in 3.7.10 and reworked the de- emphasis filter at the same time. Here's the python code that does the filter generation for both filters: https://github.com/gnuradio/gnuradio/blob/master/gr-analog/python/analog/fm_emph.py But you would need to fix more than just that file. The complete changeset to fix 3.7.9 is viewable under closed pull request #777: https://github.com/gnuradio/gnuradio/pull/777/files They are all text files and scripts, so you could conceivably fix up all your installed files without recompiling anything. It would be better to upgrade to a later version though. Regards, Andy _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
