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."



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