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<div class="moz-cite-prefix">On 05.08.2024 00:23, Mattias
Rickardsson wrote:<br>
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cite="mid:CAP92RBWsEWs90uOdnuB5pxDygYi6xNN2r5Q5KrgefhS+E5EPvw@mail.gmail.com">
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<div dir="auto">Interesting thread.</div>
<div dir="auto"><br>
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Do these vintage examples use static amplification factors in
their MDACs, or do they allow the digital value be modulated by
envelopes and LFOs?
<div dir="auto"><br>
<div dir="auto">If they do modulate stuff, how is the result
in terms of zipper noise etc? Unlike when using a VCA
controlled by a CV generated from the very same DAC, there
is no way of smoothing out the digital irregularities in the
MDAC case. Only perhaps keeping the sample rate above audio
(which they probably didn't do by then) or to use clever
noise shaping techniques (which also seems unlikely).</div>
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<p>I did intend to use this in an instrument I built some time ago. </p>
<p>Yes, it does create noise from aliasing if you do not update the
DAC fast enough. (You'd need a sampling rate well past audio and
ideally low passes in the signal chain.) <br>
</p>
<p>In the end I switched over to a VCA and smoothing the CV instead.<br>
</p>
<p><br>
</p>
<p>Best,</p>
<p> René<br>
</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:CAP92RBWsEWs90uOdnuB5pxDygYi6xNN2r5Q5KrgefhS+E5EPvw@mail.gmail.com">
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<div dir="auto">
<div dir="auto">/mr</div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Den sön 4 aug. 2024
20:48Gordonjcp <<a href="mailto:gordonjcp@gjcp.net"
moz-do-not-send="true" class="moz-txt-link-freetext">gordonjcp@gjcp.net</a>>
skrev:<br>
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<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On
Sun, Aug 04, 2024 at 06:26:06PM +0100, Tom Wiltshire wrote:<br>
> The Synclavier used DACs for VCAs like this too, fed with
audio from other DACs. In that case it was a way of avoiding
doing multiplies in hardware and not losing any resolution.<br>
> <br>
<br>
The Ensoniq DOC chip uses the same trick for the same reason.<br>
<br>
-- <br>
Gordonjcp<br>
<br>
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<pre class="moz-signature" cols="72">--
--
<a class="moz-txt-link-abbreviated" href="mailto:synth@schmitzbits.de">synth@schmitzbits.de</a>
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