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<div><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">If by 'continuous' you mean DC, then there is an image before filtering - at the sampling
rate :-)<br>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Gordonjcp <gordonjcp@gjcp.net><br>
<b>Sent:</b> 14 December 2023 15:25<br>
<b>To:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Generating a large number of CV outputs</span>
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<div><span style="font-size: 11pt;">On Sun, Dec 10, 2023 at 05:02:09PM -0800, brianw wrote:<br>
> Exactly.<br>
><br>
> 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.<br>
><br>
> 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.<br>
<br>
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.<br>
<br>
I cannot see how a continuous signal can possibly produce imaging, even if the filtering after it is quite poor.<br>
<br>
--<br>
Gordonjcp<br>
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