[sdiy] Generating a large number of CV outputs

[Mike Bryant]

If by 'continuous' you mean DC, then there is an image before filtering - at the sampling rate :-)


________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Gordonjcp <gordonjcp at gjcp.net>
Sent: 14 December 2023 15:25
To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Generating a large number of CV outputs

On Sun, Dec 10, 2023 at 05:02:09PM -0800, brianw wrote:
> Exactly.
>
> My paragraph followed a question about minimal reconstruction filtering, which is what removes images after a DAC (anti-aliasing filters prevent aliasing during ADC). Since I've seen commercial products that failed to remove images of their DAC output, I wanted to ensure that my designs don't suffer the same mistakes.
>
> The challenge is that reconstruction filters can be expensive to do correctly, unless there's significant oversampling (which is expensive on the digital processing side). It's easy enough to plop down a single-pole low-pass, but that's not good enough in nearly all cases.

I'm not saying you're wrong, but I think you'd need to demonstrate that pretty clearly to me before I'd accept it was even detectable.

I cannot see how a continuous signal can possibly produce imaging, even if the filtering after it is quite poor.

--
Gordonjcp
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