[sdiy] Novation peak NCOs

[Richie Burnett]

There's a Novation Peak review by Paul Nagle in the latest Sound On Sound 
that just landed on my doormat.

-Richie,


-----Original Message----- 
From: Veronica Merryfield
Sent: Friday, April 21, 2017 4:49 PM
To: Richie Burnett
Cc: SYNTH DIY
Subject: Re: [sdiy] Novation peak NCOs

Not read the rest of this thread just yet, but..

Isn’t this just a simple case of implementing a sigma-delta low noise DAC in 
an FPGA and closely coupling the oscillator engine to the DAC. With care, 
they probably play a few tricks with that coupling to reduce noise and 
aliasing further. The output per oscillator is a single pin that needs 
almost no external components, thus making it a simple design with the 
quality of output defined in ‘software’ thus allowing easy changes.

For an FPGA, even a cheap one, 24Mhz is slow. The real trick is that they 
should be able to run it at 10 to 20 times faster and use TDM to implement 
10 to 20 oscillators, then repeat the block for more, allowing an extremely 
rich oscillator palette relatively cheaply.

Anyway, this is not a new idea.

> On Apr 20, 2017, at 2:20 PM, Richie Burnett <rburnett at richieburnett.co.uk> 
> wrote:
>
> An interesting direction Novation are taking with the use of FPGA based 
> NCO oscillators on their new hybrid polysynth. There's a video from 
> Superbooth about it on sonicstate. It uses a sample rate of 24MHz to 
> generate classic analog saw, pulse, tri waves, etc, then feeds them 
> through conventional analog VCF, VCA, etc.
>
> Seems like a bit of a brute force way to crack the old aliasing nut, but I 
> guess it gives them the ability to do some wacky audio rate modulation 
> stuff with reduced aliasing too.
>
> -Richie,
>
> Sent from my Xperia SP on O2
>
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