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<div class="moz-cite-prefix">On 02.11.2023 11:15, Andrew Simper via
Synth-diy wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAAxOnzZG_ZQOsJZL6nKDXij3+GE9GHq28PF1dGoJ06bg64pmzw@mail.gmail.com">
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<div dir="ltr">I've already done detailed modelling on the SSM2040
and posted a video to youtube on this model being matched to the
LA67 Maca filter that uses the SSI2140.
<div><br>
</div>
<div>Can you please post links to the internals of the CEM3320?</div>
</div>
</blockquote>
<p><a class="moz-txt-link-freetext" href="https://patents.google.com/patent/US4004141A/en">https://patents.google.com/patent/US4004141A/en</a></p>
<p>Its different from the 2040 in so far that it has logarithmic
shaping before an OTA. ("linearising diodes")<br>
</p>
<p>The OTA core is very similar to the arrangement in the 2040. But
the control and audio inputs are realized differently. <br>
</p>
<p>I've been pondering about this: How can this be patentable, if
this is so similar in its working principle, and all the parts had
been used elsewhere.<br>
</p>
<p><br>
</p>
<p>Best,</p>
<p> René<br>
</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:CAAxOnzZG_ZQOsJZL6nKDXij3+GE9GHq28PF1dGoJ06bg64pmzw@mail.gmail.com">
<div dir="ltr">
<div><br>
</div>
<div>Cheers,</div>
<div><br>
</div>
<div>Andy</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, 2 Nov 2023 at 16:44,
Neil Johnson <<a href="mailto:neil.johnson71@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">neil.johnson71@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">Hi,<br>
<br>
Andrew Simper wrote:<br>
><br>
> And a few patents referenced in the articles:<br>
><br>
> Embley:<br>
> <a
href="https://patents.google.com/patent/US3532868A/en"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://patents.google.com/patent/US3532868A/en</a><br>
><br>
> Buff:<br>
> <a
href="https://patents.google.com/patent/US4341962A/en"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://patents.google.com/patent/US4341962A/en</a><br>
><br>
> Blackmer:<br>
> <a
href="https://patents.google.com/patent/US3714462A/en"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://patents.google.com/patent/US3714462A/en</a><br>
> <a
href="https://patents.google.com/patent/US4403199A/en"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://patents.google.com/patent/US4403199A/en</a><br>
<br>
If you're hunting for patents to understand the SSM2040 then
you could<br>
start with the original patent:<br>
<a href="https://patents.google.com/patent/US3969682A/en"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://patents.google.com/patent/US3969682A/en</a><br>
<br>
For fans of the SSM2044:<br>
<a href="https://patents.google.com/patent/US4404529A/en"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://patents.google.com/patent/US4404529A/en</a><br>
<br>
Neil<br>
</blockquote>
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