<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Just for interest, the complete collection of Polyphony magazines are hosted on the mu:zines website (with permission).<div><br></div><div><a href="http://www.muzines.co.uk/mags/pl">http://www.muzines.co.uk/mags/pl</a></div><div><br></div><div>There is a project on the back burner to try and do the same thing for Electronic Musician and Keyboard magazines. I have the first 10 years of EM in my collection already. The key issue is likely getting permission to put these on the Internet, plus a not small task of scanning over 800 magazines, but there have been some initial discussions on these issues already.</div><div><br></div><div>Let’s see what the future brings.</div><div><br><div dir="ltr">Regards<div><br></div><div>Mike Gorman</div></div><div dir="ltr"><br><blockquote type="cite">On 7 Mar 2022, at 09:49, Tom Bugs via Synth-diy <synth-diy@synth-diy.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>This reminded me to dig back to see what PDFs I have on my
hard-drive -- 12 copies it turns out.. (16pages each).<br>
There's so many interesting ideas in them! Really nice retro
reading - some good circuit snippets etc.<br>
I may get around to compiling them into a single PDF to send to a
doc-printing company who'll spiral bind them - much nicer reading
then ;)</p>
<p>Tom<br>
</p>
<div class="moz-cite-prefix">On 05/03/2022 21:44, grant
musictechnologiesgroup.com wrote:<br>
</div>
<blockquote type="cite" cite="mid:embcd2aedd-0c78-4a0f-a407-fc1285f22b0a@asus_n76">
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<div>What the heck is <span>Device Magazine? Sounds interesting of
course.</span></div>
<div><br>
</div>
<div>------ Original Message ------</div>
<div>From: "Pete Hartman via Synth-diy" <<a href="mailto:synth-diy@synth-diy.org" moz-do-not-send="true" class="moz-txt-link-freetext">synth-diy@synth-diy.org</a>></div>
<div>To: "Michael E Caloroso" <<a href="mailto:mec.forumreader@gmail.com" moz-do-not-send="true" class="moz-txt-link-freetext">mec.forumreader@gmail.com</a>></div>
<div>Cc: "synth-diy mailing list" <<a href="mailto:synth-diy@synth-diy.org" moz-do-not-send="true" class="moz-txt-link-freetext">synth-diy@synth-diy.org</a>></div>
<div>Sent: 3/5/2022 1:29:35 PM</div>
<div>Subject: Re: [sdiy] Mathematics of flanging</div>
<div><br>
</div>
<div id="x81642878a02c409">
<blockquote cite="CACodTR_VFcM2SN7K-=01DQc9q7yBrS_j_jEqKC0VncEeFVmmrw@mail.gmail.com" type="cite" class="cite2">
<div dir="ltr">Thanks for that Michael.<br>
<br>
I've tweaked the image so that the contrast is a bit more
readable, I figured I'm not the only one whose vision needed
such assistance, so here it is :)<br>
<br>
Pete
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Mar 5, 2022 at
12:57 PM Michael E Caloroso via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" moz-do-not-send="true" class="moz-txt-link-freetext">synth-diy@synth-diy.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Nice.
<div><br>
</div>
<div>The key to extreme flanging sounds is inversion in
place of the summing node. Many delay units do not
include inversion. The inversion produces a radically
different frequency response.</div>
<div><br>
</div>
<div>But a real "jet flanging" effect - same as the
classic technique using analog tape players - needs a
minimum of TWO delay elements. The concept of
the flanging effect heard by a listener in a fixed
position relative to a jet airplane in motion was laid
out in Electronotes #56 pg 12, so I attempted to
implement it with my Korg SDD-3300, a very flexible
triple digital delay. See attached.</div>
<div><br>
</div>
<div>The result was flanging but the effect was mild.
In Device Magazine volume 1:10:79 pg 10, Stephen St
Croix - inventor of the CCD-based Marshall Time
Modulator effect processor - lays out the crucial
criteria for effective jet flanging effects.</div>
<div><br>
</div>
<div>Digital delays aren't ideal because you can't get
deep enough modulation, the modulation LFO in digital
domain is often too discrete at low sweep rates, and
you need ~0.3ms delay (few digital delays offer short
delay times). BBDs aren't ideal because the amplitude
of the direct and delayed signals must be matched
within 0.1dB for widest notch bandwidth in the comb
filter effect. Also the bandwidth of delayed output
must be as wide as possible for deepest nulls in the
comb filter effect. The deep nulls and wide bandwidth
of the notches result in more extreme flanging
effects.</div>
<div><br>
</div>
<div>Granted, from the Electronotes concept the two
delays will need some filtering to emulate the two
delay paths between listener and jet airplane,
especially the reflected path. Also the Electronotes
concept does not take into account other indirect
reflections.</div>
<div><br>
</div>
<div>The Marshall unit used CCD based delay elements to
meet these criteria - dual independent delays,
smooth/deep LFO modulation, wide bandwidth, and
precise output matching. CCD and BBD elements are
bucket related, but operate differently. Each sample
charges the storage capacitor of each BBD element,
while each sample DRAINS the charge of an initially
fully charged CCD element. CCDs are also much
quieter.</div>
<div><br>
</div>
<div>Effect connoisseurs report that the Marshall Time
Modulator delivers the best "jet flanging" effect.</div>
<div><br>
</div>
<div>MC</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Mar 5, 2022 at
1:36 AM Lanterman, Aaron D via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" moz-do-not-send="true" class="moz-txt-link-freetext">synth-diy@synth-diy.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div style="overflow-wrap: break-word;">I just put
together a lecture on that, if you’re into that kind
of thing:
<div><br>
</div>
<div><a href="https://youtu.be/LRZW31_aAnE" moz-do-not-send="true" class="moz-txt-link-freetext">https://youtu.be/LRZW31_aAnE</a></div>
<div><br>
</div>
<div>
<div>
<div>Aaron Lanterman, Prof. of ECE, Georgia Tech<br>
My blog on Education and Innovation: <a href="https://edupocalypsenow.wordpress.com" moz-do-not-send="true" class="moz-txt-link-freetext">https://edupocalypsenow.wordpress.com</a><br>
My blog on Electronics and Programming: <a href="https://lantertronics.blogspot.com" moz-do-not-send="true" class="moz-txt-link-freetext">https://lantertronics.blogspot.com</a><br>
My YouTube channel on Electronics
and Programming: <a href="https://www.youtube.com/c/lantertronics" moz-do-not-send="true" class="moz-txt-link-freetext">https://www.youtube.com/c/lantertronics</a></div>
<div><br>
</div>
<br>
</div>
<br>
</div>
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