faust2caqt on the Mac On Wed, Jul 7, 2021 at 2:38 PM Stéphane Letz <l...@grame.fr> wrote:
> Using which architecture? > > Thanks. > > Stéphane > > > Le 7 juil. 2021 à 23:34, Julius Smith <julius.sm...@gmail.com> a écrit : > > > > Hmmm, this test points to a hbargraph gating behavior in its display > only, although I did not run it for a long time: > > > > import("stdfaust.lib"); > > Tg = 0.4; > > zi = an.ms_envelope_rect(Tg); > > //gain = hslider("Gain [unit:dB]",-10,-70,0,0.1) : ba.db2linear; > > gain = 0.01; // -40 dB - ok in Octave (I get -44.744 dB) > > sig = no.noise * gain; > > level = zi : ba.linear2db : *(0.5); > > //process = level, attach(sig, (sig : level : hbargraph("test",-70,0))); > > process = sig : level <: _, hbargraph("test",-70,0); > > > > On Wed, Jul 7, 2021 at 12:50 PM Juan Carlos Blancas <lav...@gmail.com> > wrote: > > Hi Klaus, > > > > Same here, it seems there is something with ms and rms_envelope. > > > > Best, > > Juan Carlos > > > > import("stdfaust.lib"); > > > > rms(n) = _ : square : mean(n) : sqrt; > > square(x) = x * x; > > mean(n) = float2fix : integrate(n) : fix2float : /(n); > > integrate(n,x) = x - x@n : +~_; > > float2fix(x) = int(x*(1<<20)); > > fix2float(x) = float(x)/(1<<20); > > > > Tg = 0.4; > > zi = an.ms_envelope_rect(Tg); > > ziR = an.rms_envelope_rect(Tg); > > > > process = no.noise*1.737 * > ba.db2linear(hslider("[0]g[unit:dB]",-20,-95,-10,0.1)) <: > > attach(_, rms(ma.SR*Tg) : ba.linear2db : hbargraph("[1]rms",-95,0)), > > attach(_, sqrt(zi) : ba.linear2db : > hbargraph("[2]sqrt(ms_envelope_rect)",-95,0)), > > attach(_, ziR : ba.linear2db : hbargraph("[3]rms_envelope_rect",-95,0)); > > > > > > > El 7 jul 2021, a las 9:59, Klaus Scheuermann <kla...@posteo.de> > escribió: > > > > > > Hi all, > > > I did some testing and > > > > > > an.ms_envelope_rect() > > > > > > seems to show some strange behaviour (at least to me). Here is a video > > > of the test: > > > https://cloud.4ohm.de/s/64caEPBqxXeRMt5 > > > > > > The audio is white noise and the testing code is: > > > > > > import("stdfaust.lib"); > > > Tg = 0.4; > > > zi = an.ms_envelope_rect(Tg); > > > process = _ : zi : ba.linear2db : hbargraph("test",-95,0); > > > > > > Could you please verify? > > > > > > Thanks, Klaus > > > > > > > > > > > > On 05.07.21 20:16, Julius Smith wrote: > > >> Hmmm, '!' means "block the signal", but attach should save the > bargraph > > >> from being optimized away as a result. Maybe I misremembered the > > >> argument order to attach? While it's very simple in concept, it can > be > > >> confusing in practice. > > >> > > >> I chose not to have a gate at all, but you can grab one from > > >> misceffects.lib if you like. Low volume should not give -infinity, > > >> that's a bug, but zero should, and zero should become MIN as I > mentioned > > >> so -infinity should never happen. > > >> > > >> Cheers, > > >> Julius > > >> > > >> > > >> On Mon, Jul 5, 2021 at 10:39 AM Klaus Scheuermann <kla...@posteo.de > > >> <mailto:kla...@posteo.de>> wrote: > > >> > > >> Cheers Julius, > > >> > > >> > > >> > > >> At least I understood the 'attach' primitive now ;) Thanks. > > >> > > >> > > >> > > >> This does not show any meter here... > > >> process(x,y) = x,y <: (_,_), attach(x, (Lk2 : > vbargraph("LUFS",-90,0))) > > >> : _,_,!; > > >> > > >> But this does for some reason (although the output is 3-channel > then): > > >> process(x,y) = x,y <: (_,_), attach(x, (Lk2 : > vbargraph("LUFS",-90,0))) > > >> : _,_,_; > > >> > > >> What does the '!' do? > > >> > > >> > > >> > > >> I still don't quite get the gating topic. In my understanding, the > meter > > >> should hold the current value if the input signal drops below a > > >> threshold. In your version, the meter drops to -infinity when very > low > > >> volume content is played. > > >> > > >> Which part of your code does the gating? > > >> > > >> Many thanks, > > >> Klaus > > >> > > >> > > >> > > >> On 05.07.21 18:06, Julius Smith wrote: > > >>> Hi Klaus, > > >>> > > >>> Yes, I agree the filters are close enough. I bet that the shelf is > > >>> exactly correct if we determined the exact transition frequency, and > > >>> that the Butterworth highpass is close enough to the > > >> Bessel-or-whatever > > >>> that is inexplicably not specified as a filter type, leaving it > > >>> sample-rate dependent. I would bet large odds that the differences > > >>> cannot be reliably detected in listening tests. > > >>> > > >>> Yes, I just looked again, and there are "gating blocks" defined, > > >> each Tg > > >>> = 0.4 sec long, so that only ungated blocks are averaged to form a > > >>> longer term level-estimate. What I wrote gives a "sliding gating > > >>> block", which can be lowpass filtered further, and/or gated, etc. > > >>> Instead of a gate, I would simply replace 0 by ma.EPSILON so that the > > >>> log always works (good for avoiding denormals as well). > > >>> > > >>> I believe stereo is supposed to be handled like this: > > >>> > > >>> Lk2 = _,0,_,0,0 : Lk5; > > >>> process(x,y) = Lk2(x,y); > > >>> > > >>> or > > >>> > > >>> Lk2 = Lk(0),Lk(2) :> 10 * log10 : -(0.691); > > >>> > > >>> but since the center channel is processed identically to left > > >> and right, > > >>> your solution also works. > > >>> > > >>> Bypassing is normal Faust, e.g., > > >>> > > >>> process(x,y) = x,y <: (_,_), attach(x, (Lk2 : > > >> vbargraph("LUFS",-90,0))) > > >>> : _,_,!; > > >>> > > >>> Cheers, > > >>> Julius > > >>> > > >>> > > >>> On Mon, Jul 5, 2021 at 1:56 AM Klaus Scheuermann <kla...@posteo.de > > >> <mailto:kla...@posteo.de> > > >>> <mailto:kla...@posteo.de <mailto:kla...@posteo.de>>> wrote: > > >>> > > >>> > > >>> > I can never resist these things! Faust makes it too > > >> enjoyable :-) > > >>> > > >>> Glad you can't ;) > > >>> > > >>> I understood you approximate the filters with standard faust > > >> filters. > > >>> That is probably close enough for me :) > > >>> > > >>> I also get the part with the sliding window envelope. If I > > >> wanted to > > >>> make the meter follow slowlier, I would just widen the window > > >> with Tg. > > >>> > > >>> The 'gating' part I don't understand for lack of mathematical > > >> knowledge, > > >>> but I suppose it is meant differently. When the input signal > > >> falls below > > >>> the gate threshold, the meter should stay at the current > > >> value, not drop > > >>> to -infinity, right? This is so 'silent' parts are not taken > into > > >>> account. > > >>> > > >>> If I wanted to make a stereo version it would be something like > > >>> this, right? > > >>> > > >>> Lk2 = par(i,2, Lk(i)) :> 10 * log10 : -(0.691); > > >>> process = _,_ : Lk2 : vbargraph("LUFS",-90,0); > > >>> > > >>> Probably very easy, but how do I attach this to a stereo > > >> signal (passing > > >>> through the stereo signal)? > > >>> > > >>> Thanks again! > > >>> Klaus > > >>> > > >>> > > >>> > > >>> > > > >>> > I made a pass, but there is a small scaling error. I think > > >> it can be > > >>> > fixed by reducing boostFreqHz until the sine_test is nailed. > > >>> > The highpass is close (and not a source of the scale error), > > >> but I'm > > >>> > using Butterworth instead of whatever they used. > > >>> > I glossed over the discussion of "gating" in the spec, and > > >> may have > > >>> > missed something important there, but > > >>> > I simply tried to make a sliding rectangular window, instead > > >> of 75% > > >>> > overlap, etc. > > >>> > > > >>> > If useful, let me know and I'll propose it for analyzers.lib! > > >>> > > > >>> > Cheers, > > >>> > Julius > > >>> > > > >>> > import("stdfaust.lib"); > > >>> > > > >>> > // Highpass: > > >>> > // At 48 kHz, this is the right highpass filter (maybe a > > >> Bessel or > > >>> > Thiran filter?): > > >>> > A48kHz = ( /* 1.0, */ -1.99004745483398, 0.99007225036621); > > >>> > B48kHz = (1.0, -2.0, 1.0); > > >>> > highpass48kHz = fi.iir(B48kHz,A48kHz); > > >>> > highpass = fi.highpass(2, 40); // Butterworth highpass: > > >> roll-off is a > > >>> > little too sharp > > >>> > > > >>> > // High Shelf: > > >>> > boostDB = 4; > > >>> > boostFreqHz = 1430; // a little too high - they should give > > >> us this! > > >>> > highshelf = fi.high_shelf(boostDB, boostFreqHz); // Looks > > >> very close, > > >>> > but 1 kHz gain has to be nailed > > >>> > > > >>> > kfilter = highshelf : highpass; > > >>> > > > >>> > // Power sum: > > >>> > Tg = 0.4; // spec calls for 75% overlap of successive > > >> rectangular > > >>> > windows - we're overlapping MUCH more (sliding window) > > >>> > zi = an.ms_envelope_rect(Tg); // mean square: average power = > > >>> energy/Tg > > >>> > = integral of squared signal / Tg > > >>> > > > >>> > // Gain vector Gv = (GL,GR,GC,GLs,GRs): > > >>> > N = 5; > > >>> > Gv = (1, 1, 1, 1.41, 1.41); // left GL(-30deg), right GR > > >> (30), center > > >>> > GC(0), left surround GLs(-110), right surr. GRs(110) > > >>> > G(i) = *(ba.take(i+1,Gv)); > > >>> > Lk(i) = kfilter : zi : G(i); // one channel, before summing > > >> and before > > >>> > taking dB and offsetting > > >>> > LkDB(i) = Lk(i) : 10 * log10 : -(0.691); // Use this for a > mono > > >>> input signal > > >>> > > > >>> > // Five-channel surround input: > > >>> > Lk5 = par(i,5,Lk(i)) :> 10 * log10 : -(0.691); > > >>> > > > >>> > // sine_test = os.oscrs(1000); // should give –3.01 LKFS, with > > >>> > GL=GR=GC=1 (0dB) and GLs=GRs=1.41 (~1.5 dB) > > >>> > sine_test = os.osc(1000); > > >>> > > > >>> > process = sine_test : LkDB(0); // should read -3.01 LKFS - > > >> high-shelf > > >>> > gain at 1 kHz is critical > > >>> > // process = 0,sine_test,0,0,0 : Lk5; // should read -3.01 > > >> LKFS for > > >>> > left, center, and right > > >>> > // Highpass test: process = 1-1' <: highpass, highpass48kHz; > > >> // fft in > > >>> > Octave > > >>> > // High shelf test: process = 1-1' : highshelf; // fft in > Octave > > >>> > > > >>> > On Sat, Jul 3, 2021 at 1:08 AM Klaus Scheuermann > > >> <kla...@posteo.de <mailto:kla...@posteo.de> > > >>> <mailto:kla...@posteo.de <mailto:kla...@posteo.de>> > > >>> > <mailto:kla...@posteo.de <mailto:kla...@posteo.de> > > >> <mailto:kla...@posteo.de <mailto:kla...@posteo.de>>>> wrote: > > >>> > > > >>> > Hello everyone :) > > >>> > > > >>> > Would someone be up for helping me implement an LUFS > > >> loudness > > >>> analyser > > >>> > in faust? > > >>> > > > >>> > Or has someone done it already? > > >>> > > > >>> > LUFS (aka LKFS) is becoming more and more the standard for > > >>> loudness > > >>> > measurement in the audio industry. Youtube, Spotify and > > >> broadcast > > >>> > stations use the concept to normalize loudness. A very > > >>> positive side > > >>> > effect is, that loudness-wars are basically over. > > >>> > > > >>> > I looked into it, but my programming skills clearly > > >> don't match > > >>> > the level for implementing this. > > >>> > > > >>> > Here is some resource about the topic: > > >>> > > > >>> > https://en.wikipedia.org/wiki/LKFS > > >> <https://en.wikipedia.org/wiki/LKFS> > > >>> <https://en.wikipedia.org/wiki/LKFS > > >> <https://en.wikipedia.org/wiki/LKFS>> > > >>> <https://en.wikipedia.org/wiki/LKFS > > >> <https://en.wikipedia.org/wiki/LKFS> > > >>> <https://en.wikipedia.org/wiki/LKFS > > >> <https://en.wikipedia.org/wiki/LKFS>>> > > >>> > > > >>> > Specifications (in Annex 1): > > >>> > > > >>> > > >> > https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-3-201208-S!!PDF-E.pdf > > >> < > https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-3-201208-S!!PDF-E.pdf > > > > >>> > > >> < > https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-3-201208-S!!PDF-E.pdf > > >> < > https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-3-201208-S!!PDF-E.pdf > >> > > >>> > > > >>> > > >> < > https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-3-201208-S!!PDF-E.pdf > > >> < > https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-3-201208-S!!PDF-E.pdf > > > > >>> > > >> < > https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-3-201208-S!!PDF-E.pdf > > >> < > https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-3-201208-S!!PDF-E.pdf > >>> > > >>> > > > >>> > An implementation by 'klangfreund' in JUCE / C: > > >>> > https://github.com/klangfreund/LUFSMeter > > >> <https://github.com/klangfreund/LUFSMeter> > > >>> <https://github.com/klangfreund/LUFSMeter > > >> <https://github.com/klangfreund/LUFSMeter>> > > >>> > <https://github.com/klangfreund/LUFSMeter > > >> <https://github.com/klangfreund/LUFSMeter> > > >>> <https://github.com/klangfreund/LUFSMeter > > >> <https://github.com/klangfreund/LUFSMeter>>> > > >>> > > > >>> > There is also a free LUFS Meter in JS / Reaper by > > >> Geraint Luff. > > >>> > (The code can be seen in reaper, but I don't know if I > > >> should > > >>> paste it > > >>> > here.) > > >>> > > > >>> > Please let me know if you are up for it! > > >>> > > > >>> > Take care, > > >>> > Klaus > > >>> > > > >>> > > > >>> > _______________________________________________ > > >>> > Faudiostream-users mailing list > > >>> > Faudiostream-users@lists.sourceforge.net > > >> <mailto:Faudiostream-users@lists.sourceforge.net> > > >>> <mailto:Faudiostream-users@lists.sourceforge.net > > >> <mailto:Faudiostream-users@lists.sourceforge.net>> > > >>> > <mailto:Faudiostream-users@lists.sourceforge.net > > >> <mailto:Faudiostream-users@lists.sourceforge.net> > > >>> <mailto:Faudiostream-users@lists.sourceforge.net > > >> <mailto:Faudiostream-users@lists.sourceforge.net>>> > > >>> > > > >>> > > >> https://lists.sourceforge.net/lists/listinfo/faudiostream-users > > >> <https://lists.sourceforge.net/lists/listinfo/faudiostream-users> > > >>> > > >> <https://lists.sourceforge.net/lists/listinfo/faudiostream-users > > >> <https://lists.sourceforge.net/lists/listinfo/faudiostream-users>> > > >>> > > > >>> > > >> <https://lists.sourceforge.net/lists/listinfo/faudiostream-users > > >> <https://lists.sourceforge.net/lists/listinfo/faudiostream-users> > > >>> > > >> <https://lists.sourceforge.net/lists/listinfo/faudiostream-users > > >> <https://lists.sourceforge.net/lists/listinfo/faudiostream-users > >>> > > >>> > > > >>> > > > >>> > > > >>> > -- > > >>> > "Anybody who knows all about nothing knows everything" -- > > >> Leonard > > >>> Susskind > > >>> > > >>> > > >>> > > >>> -- > > >>> "Anybody who knows all about nothing knows everything" -- Leonard > > >> Susskind > > >> > > >> > > >> > > >> -- > > >> "Anybody who knows all about nothing knows everything" -- Leonard > Susskind > > > > > > > > > _______________________________________________ > > > Faudiostream-users mailing list > > > Faudiostream-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/faudiostream-users > > > > > > > > _______________________________________________ > > Faudiostream-users mailing list > > Faudiostream-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/faudiostream-users > > > > > > -- > > "Anybody who knows all about nothing knows everything" -- Leonard > Susskind > > _______________________________________________ > > Faudiostream-users mailing list > > Faudiostream-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/faudiostream-users > > -- "Anybody who knows all about nothing knows everything" -- Leonard Susskind
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