Hi, Oleg. :-) On Fri, 18 Dec 2020 at 19:10, Oleg Nesterov <o...@redhat.com> wrote:
> Hi Dario, > > this motivated me to look at your library again ;) > I hope you found a couple of good things, and please do let me know if you see anything that can be improved or fixed. > > On 12/18, Alik Rustamoff wrote: > > > > Hi, Dario, I, btw, ended up using blti filter from your edge of chaos > > library. Good collection. No noises just does the job. > > Then I think that fi.svf.hp() should work equally well. Can you try it? > See > https://github.com/grame-cncm/faustlibraries/blob/master/filters.lib#L2611 > > And this probably means that Dario was right, and the problem was caused > by quantisation. > > Because IIUC in theory (and unless you modulate HPFfreq) these 3 filters > > fi.highpass(2, f) > fi.svf.hp(f, 1/sqrt(2)) > svf2blti(f, 1/sqrt(2), 1) : ba.selectn(10,1) > > should have the same transfer function / impulse response. > The IR of the filters with -double is the following, with a 20 Hz CF: Darios-MBP:edgeofchaos dariosanfilippo1$ ./test_hp -sr 96000 -s 9600 -n 1 channel 1, channel 2, channel 3 -1.4107325142354377e-11, -1.4107325144178732e-11, -1.4107325144183914e-11 I thought that our SVF filters might have had exactly the same calculations, but there's still some difference in the response. I used Pirkle, which text did you use? If I run faustbench -double on your filter and mine, I get the following results: yours: Best value is : 1176.06 with -double -vec -fun -lv 0 -vs 128 mine: Best value is : 1324.58 with -double -vec -fun -lv 0 -vs 64 If I'm not wrong, a higher value indicates a faster DSP, but that's for some specific settings. I see that the "DSP size" indicated in the benchmark is always the same for both filters; what does that indicate? I don't think it's the number of calculations as it changed when using -single or -double for the bench test. Ciao, Dario > Oleg. > > -- Dr Dario Sanfilippo http://dariosanfilippo.com
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