Cool, these are great to have for evaluation, learning, and variety of choice, thanks!
- Julius On Sat, May 23, 2020 at 2:24 PM Dario Sanfilippo <sanfilippo.da...@gmail.com> wrote: > > Thanks for testing, Julius. > > I'll see if I can get the limiter in Zölzers book in the next few days and > I'll do another PR with that if I manage. > > I've also just added the stereo version of the other limiter: > https://github.com/grame-cncm/faustlibraries/pull/37/commits/12763e053c7fb84371cfaa17bf89f2c9a1821418 > . > > Dario > > > On Sat, 23 May 2020 at 22:10, Julius Smith <julius.sm...@gmail.com> wrote: > >> Since the delay for the input path is our "lookahead delay", setting it >> to the attack time sounds ideal to me. >> >> On Sat, May 23, 2020 at 12:54 PM Julius Smith <julius.sm...@gmail.com> >> wrote: >> >>> I've been happy with limiter_1176_R4_mono, but I'll now compare it >>> to limiter_basic_mono, by offering both with a checkbox to choose, and >>> listen for the difference (see attached test program). >>> My limiter needs are merely to turn hard-clipping into soft-clipping for >>> voice and tonal instruments. >>> >>> I believe the "limiter slope" is the compression ratio to use above >>> threshold (4 in the case of limiter_1176_R4_mono). >>> >>> >>> >>> On Sat, May 23, 2020 at 3:57 AM Dario Sanfilippo < >>> sanfilippo.da...@gmail.com> wrote: >>> >>>> >>>> Hi, Julius. I understand. >>>> >>>> See this: >>>> https://github.com/grame-cncm/faustlibraries/pull/37/commits/8f1bd1ba78ff4919637a9bfd9ec635225cfb4ba5 >>>> . >>>> >>>> That's a basic lookahead limiter based on this post: >>>> http://iem.at/~zmoelnig/publications/limiter/. >>>> >>>> This algorithm is even simpler: it just calculates the amplitude >>>> profile using a peak-holder and it smooths out attack and release using, >>>> respectively, a one-pole lowpass and a peak envelope. Those filters are >>>> based on the e^(-2pi) time constant (Chamberlin's design for 1pole >>>> filters). This time constant works in this case as the input delay is set >>>> by the attack of the system, so the amplitude profile to calculate the >>>> scaling factor roughly reaches its maximum after the attack time. The >>>> release time might be changed with some other constant, if more >>>> appropriate. >>>> >>>> Personally, I'm satisfied with it but I also designed it for my >>>> specific case, that is, stability in self-oscillating systems. I needed a >>>> cheap solution with low distortion; I'm not sure if this works well for >>>> most applications. People are invited to test and comment. >>>> >>>> I had a look at Zölzer's limiter, pp 231 and 232, but I don't quite >>>> understand what "the slope of the limiter" is. What do you think? He >>>> also doesn't mention a specific delay for the input path but I'd assume >>>> that it is the same as the attack time. >>>> >>>> Dario >>>> >>>> >>>> On Sat, 23 May 2020 at 01:38, Julius Smith <julius.sm...@gmail.com> >>>> wrote: >>>> >>>>> Hi Dario, >>>>> >>>>> Yes the current limiter is simply a compressor, using the usual >>>>> (causal) amplitude follower, that applies a ratio of 4 starting halfway up >>>>> (-6 dB). Please feel free to make us a new one that is nicer! >>>>> >>>>> Julius >>>>> >>>>> On Fri, May 22, 2020 at 11:19 AM Dario Sanfilippo < >>>>> sanfilippo.da...@gmail.com> wrote: >>>>> >>>>>> Hello, list. >>>>>> >>>>>> Am I missing something with co.limiter_1176_R4_mono? I see that >>>>>> there is no lookahead mechanism inside and, if I test it with a song at >>>>>> +60dB, the output of the limiter is rather consistently at about 25 dB. >>>>>> >>>>>> Best, >>>>>> Dario >>>>>> _______________________________________________ >>>>>> 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 >>>>> >>>> >>> >>> -- >>> "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
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