[sdiy] In praise of the ATM STM32F303

[Gordonjcp]

On Fri, Feb 12, 2016 at 09:01:50PM -0000, Richie Burnett wrote:
> Did you base it on the Jon Datorro "Lexicon Plate" reverb algorithm
> too?  Or one of the Spin Semiconductor FV-1 algorithms?  Or
> something you designed yourself?
 
I based it on https://ccrma.stanford.edu/~jos/pasp/Schroeder_Reverberators.html
and a lot of fiddling and guesswork

This is the floating point version - I can't seem to find the fixed-point one, which may be on my spare laptop.  It uses longer periods but the fixed-point one uses 2048-word delays.

https://github.com/gordonjcp/reverb

> I know the early Reverb pioneers had to be really clever in making
> their algorithms make the best use of what limited (expensive!)
> memory they had available to them back then.  With only a small
> amount of delay memory you have to use lots of diffusion to scatter
> the energy around each time it passes around the loop otherwise you
> hear audible repetitions.

Mine has a distinctive "rattle" at certain settings, and certainly sounds a lot better on sounds with a relatively slow attack and decay.  That being said, the "bittiness" seems to be lost with busy drum patterns.

-- 
Gordonjcp MM0YEQ