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
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> > >>>
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> > >> <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
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> >
> >
> >
> > _______________________________________________
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> >
> >
> > --
> > "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
>
>
--
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