[sdiy] Quality reverb on STM32's?

[Eric Brombaugh]

It really depends on your definition of "quality". I've been able to 
build reverbs on STM32F4 and STM32F7 that sound like reverb but probably 
wouldn't have the cognoscenti turning cartwheels, but then I was just 
spitballing to see if it'd work and didn't spend a lot of effort on 
tuning them up.

It all comes down to what kind of compromises you're willing to make - 
choice of algorithms, tolerance for short RT60, metallic / resonant 
artifacts, etc. Tuning up a reverb that sounds great is definitely an 
art, not science and the folks who do that will spend a long time to get 
it just right.

For reference, the Spin FV-1 reverb chip has just 32k samples (using 
their crazy reduced-precision floating point format) of on-chip memory 
that's used for delay buffers and allpass filters. Those reverbs are 
passable if not fantastic. I was able to port one of their demo 
algorithms to an STM32F405 using only on-chip memory and it worked fine. 
With off-chip memory I'm sure you could do even better.

Eric

On 04/13/2018 12:25 PM, KD KD wrote:
> So when we the unwashed public finally have access to 32bit and SAI/I2S
> with large on board SRAM's i wonder how many Mhz and Kbytes do one
> need to make "quality reverb" on STM32? I'm thinking of how much is
> "enough" to make quality reverb with the known principles excluding the
> large memory sampled ones?
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