[sdiy] Drum sample playback

[Matthias Puech]

Hi,

Yes, it looks like an interesting little board. What is that impressive
though?
I didn't know about this particular codec, it could be handy in a module
design. Now if I put aside SDIO throughput (which I don't know much about),
it doesn't seem that surprising to be able to read 32 samples at the same
time. We can already achieve 32+ linearly interpolated voices on an STM32F4
(Cortex-M4 @ 200MHz) at 48kHz, and the M7 has far better performance
(300MHz, better FPU) so there should be room for better interpolation (or
more polyphony). Am I missing something?

Best,
    -m
On Fri, Feb 17, 2017 at 11:45 PM, Richie Burnett <
rburnett at richieburnett.co.uk> wrote:

> That's impressive!
>
> It's usually the resampling that takes the majority of CPU cycles with
> sample playback. So for a given amount of CPU power you can either have
> tons of voices that alias like hell when you transpose the samples or a
> quarter of those voices with nice clean detuning of the samples. I suspect
> this is where they might have cut corners.
>
> Of course if you want to pitch up a Hi-hat sample and the playback module
> has crap resampling, then there's nothing to stop you transposing the
> sample in a decent audio processing package first before sticking it on the
> sd card.  (That's what I used to do with my old Akai S01 sampler that had
> crappy linear interpolation, and turned hi-hat samples into rustling paper
> bag sounds as soon as you touched the transpose control!)
>
> -Richie,
>
> Sent from my Xperia SP on O2
>
> ---- paula at synth.net wrote ----
>
> >OMG,
> >
> >anyone seen this?
> >
> >https://www.sparkfun.com/products/13810
> >
> >upto 32 samples playing back at the same time, built in MIDI, 8 outputs
> >which can dynamically assign. Just WOAH
> >
> >Paula
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