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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