[sdiy] Nord Modular DIY

[Tom Wiltshire]

+1 agree here too.

Even on the dsPIC, the DSP instructions are able to do five different things in one instruction - do the MAC, preload registers for the next instruction, increment pointers, store the other accumulator. Efficient DSP code on dsPIC boils down to making use of as many of these features as you possibly can in a given situation!

Tom

On 3 Mar 2016, at 16:19, Tim Ressel <timr at circuitabbey.com> wrote:

> DSPs have special hardware to speed things up. Even though an STM32 can do single cycle MACs they don't have the other things that make DSPs fast. Figure 4-5X speed improvement DSP vs CPU for a given clock speed, approx. Of course one can put more than one STM32 in a design...
> 
> --tr
> 
> On 3/3/2016 7:39 AM, Simon Brouwer wrote:
>> Right, so the MS2000 used a 100 MIPS DSP56362 for 4 voices of polyphony.
>> 
>> I get that a DSP is significantly more efficient in signal processing tasks than
>> a general purpose processor, but  wouldn't a STM32F446 (225 MIPS) be able to
>> achieve similar performance?
>> 
>> Best regards
>> Simon
>> 
>>> On 03 March 2016 at 14:31 Gordonjcp <gordonjcp at gjcp.net> wrote:
>>> 
>>> 
>>> On Wed, Mar 02, 2016 at 08:17:07AM -0800, Tim Ressel wrote:
>>>> Hi,
>>>> 
>>>> I've always been interested in a software based synth that was
>>>> configured through an app. I took a whack at it many years ago but
>>>> never got very far. Then I found the Nord Modular and that seemed to
>>>> fill the need nicely. Why re-invent the wheel?  But then they get
>>>> discontinued, and used G2s go for $1000.
>>>> 
>>>> So maybe its time for the DIY thing after all.  Anybody interested?
>>> Grab a copy of the service manual for the Korg MS2000.  It looks pretty
>>> DIY-able ;-)
>>> 
>>> -- 
>>> Gordonjcp
>>> 
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> 
> -- 
> --Tim Ressel
> Circuit Abbey
> timr at circuitabbey.com
> 
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