[sdiy] Quality reverb on STM32's?

Terry Shultz thx1138 at earthlink.net
Fri Apr 13 21:55:34 CEST 2018


Hi Eric,

Why not use our AudioWeaver tools with the STM 32 Discovery boards  https://dspconcepts.com/st <https://dspconcepts.com/st>
Tools are for free and allows near realtime debug / Tuning and we have a ton of examples.

best regards,

Terry

> On Apr 13, 2018, at 12:38 PM, Eric Brombaugh <ebrombaugh1 at cox.net> wrote:
> 
> 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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