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    <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>
                  </div>
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                </blockquote>
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            </blockquote>
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        </blockquote>
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