Or as I said before, even for N bands, one parameter, “Preset” works wonders to describe the purpose and accommodate different use cases.
> On 23. Mar 2018, at 17:44, gm <g...@voxangelica.net> wrote: > > For equally spaced bands you could do it with 2 parameters, one to shift the > middle or base frequency > and one spread or fan parameter that spreads or narrows the bands. > > The reason I don't want this, is that I don't want too many parameters > and the user doesn't know how to set the bands either, especially since > the difference is probably not obvious, sonically. > > But it's an option I am considering. > > > > Am 23.03.2018 um 16:50 schrieb Matt Jackson: >> If it’s a distortion or compression and only 2-4 bands, a user set >> crossover(s) would usually be desirable. >> The Ableton Multi-band Dynamics, Waves C4, Ohm Force Ohmacide, Izotope >> plugins, Surreal Machines Transient Machines all come to mind. >> It probably depends on the complexity you are looking for but some presets >> for “voice”, "full mix”, “drums” etc. usually go a long way. >> >>> On 23. Mar 2018, at 15:05, gm <g...@voxangelica.net> wrote: >>> >>> >>> The purpose is multiband compression and distortion. >>> >>> So I only have a few bands, 2 to 5. >>> >>> I use ERB scale in my vocoder, which worked slightly better than Bark scale >>> for me (it seems better defined at the low range) >>> >>> I was wondering if I should use it here too or if it's better on a log2 >>> scale. >>> >>> Also I cant decide what upper and lower frequency I should use when I >>> divide evenly on a log scale. >>> >>> I chose 100 Hz cause thats the lowest Bark band I think. >>> >>> >>> Am 23.03.2018 um 14:39 schrieb Matt Jackson: >>>> Gabriel, >>>> >>>> I think it depends on what you are trying to do. What’s your context? >>>> >>>> For example a Vocoder (for voice) might have a different distribution of >>>> bands (bark scale) than a multipurpose graphic EQ (even octaves). >>>> One strange example I know of is the Serge resonant EQ (not crossovers but >>>> fixed frequency resonant peaks) has deliberately picked frequencies that, >>>> “except for the top and bottom frequency bands, the bands are spaced at an >>>> interval of a major seventh. The Resonant Equalizer is designed to produce >>>> formant peaks and valleys similar to those in acoustic instruments.” >>>> >>>> Matt >>>> >>>>> On 23. Mar 2018, at 13:05, robert bristow-johnson >>>>> <r...@audioimagination.com> wrote: >>>>> >>>>> On 3/23/18 12:01 AM, gm wrote: >>>>>> What are good frequencies for band splits? (2-5 bands) >>>>>> >>>>>> What I am doing is divide the range between 100 Hz 5-10 kHz >>>>>> into equal bands on a log scale (log2 or pitch). >>>>>> >>>>>> Are there better strategies? >>>>>> Or better min/max frequencies? >>>>>> How is it usually done? >>>>> conventionally, a graphic EQ might be split into bands with log center >>>>> frequencies every octave, for a 10 band, or every 1/3 octave for a 31 >>>>> band EQ. >>>>> >>>>> i think the 10-octave frequencies might be at >>>>> >>>>> 25, 50, 100, 200, 400, 800, 1600, 3200, 6400, 12800 Hz >>>>> >>>>> with the bandedges at the geometric mean of adjacent pair of frequencies >>>>> >>>>> but they might put them conventionally at >>>>> >>>>> 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000 Hz >>>>> >>>>> you can see there's a bigger-than-octave gap between 200 and 500. >>>>> >>>>> maybe the 31-band 1/3 octave frequencies might conventionally be at >>>>> >>>>> 20, 25, 32, 40, 50, 63, 80, 100, 125, 160, 200, 250, 320, 400, 500, 630, >>>>> 800, 1000, 1250, 1600, 2000, 2500, 3200, 4000, 5000, 6300, 8000, 10000, >>>>> 12500, 16000, 20000 Hz >>>>> >>>>> those are conventional frequencies. not all spacing are exactly 1/3 >>>>> octave. you can see that 630 is a compromise between twice 320 and half >>>>> of 1250. you might want your bands split precisely in 1/3 octaves spaced >>>>> apart by a frequency ratio of 2^(1/3) which is about 1.26. that might >>>>> have bands labeled: >>>>> >>>>> 20, 25, 32, 40, 50, 63, 80, 100, 126, 159, 200, 252, 318, 400, 504, 635, >>>>> 800, 1007, 1271, 1600, 2014, 2542, 3200, 4028, 5084, 6400, 8056, 10168, >>>>> 12800, 16112, 20336 Hz >>>>> >>>>> >>>>> -- >>>>> >>>>> r b-j r...@audioimagination.com >>>>> >>>>> "Imagination is more important than knowledge." >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> dupswapdrop: music-dsp mailing list >>>>> music-dsp@music.columbia.edu >>>>> https://lists.columbia.edu/mailman/listinfo/music-dsp >>>>> >>>> _______________________________________________ >>>> dupswapdrop: music-dsp mailing list >>>> music-dsp@music.columbia.edu >>>> https://lists.columbia.edu/mailman/listinfo/music-dsp >>> _______________________________________________ >>> dupswapdrop: music-dsp mailing list >>> music-dsp@music.columbia.edu >>> https://lists.columbia.edu/mailman/listinfo/music-dsp >> _______________________________________________ >> dupswapdrop: music-dsp mailing list >> music-dsp@music.columbia.edu >> https://lists.columbia.edu/mailman/listinfo/music-dsp > > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
