Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-27 Thread gm
Am 27.03.2018 um 19:29 schrieb David Reaves: If what you do involves material with an unusual spectral balance, and/or if you use aggressive filter roll offs and/or you use something other than RMS detection, then my assumptions may not be useful. that is understood. there are not many

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-27 Thread gm
This actually explains a few misconceptions I had in the past.. Both slopes are filed under "natural spectrum" in my mind. Am 27.03.2018 um 19:16 schrieb robert bristow-johnson:> > I believe thats equal energy on a -6dB/octave spectrum and gives figures > very close no, that's -3 dB/oct.

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-27 Thread David Reaves
What I meant when I explained how I derived my crossover frequencies, was that I used actual, typical program audio and **its own inherent spectral energy density distribution** to determine empirically (over many months work) generally where to set the frequencies. Much typical

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-27 Thread robert bristow-johnson
Original Message Subject: Re: [music-dsp] bandsplitting strategies (frequencies) ? From: "gm" <g...@voxangelica.net> Date: Tue, March 27, 2018 6:10 am To: music-dsp@mu

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-27 Thread gm
i keep dividing into equal bands on a log2 scale, I believe thats equal energy on a -6dB/octave spectrum and gives figures very close to what David Reaves suggested the other day for 4 bands when you set 6300 Hz as the upper limit and 150 Hz corner frequency for the bass band (or 45 Hz

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-27 Thread Theo Verelst
gm wrote: What are good frequencies for band splits? (2-5 bands) For standard mastering applications there are norms for binoral and Equal Loudness Curve related reasons. The well known PC software probably doesn't get there but it may be you want to tune those frequencies based on the

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-23 Thread Matt Jackson
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 wrote: > > For equally spaced bands you could do it with 2 parameters, one to shift the > middle or

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-23 Thread gm
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,

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-23 Thread David Reaves
I designed a four-band AGC for broadcast about 20 years ago, using single-pole subtractive band split filters. I used RMS detection, and wanting each band’s processing to be doing roughly equal ‘work,’ determined the crossover frequencies on the basis of typical energy distribution. This

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-23 Thread 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

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-23 Thread gm
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

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-23 Thread 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

Re: [music-dsp] bandsplitting strategies (frequencies) ?

2018-03-23 Thread robert bristow-johnson
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?