<div dir="ltr">I think maybe this has branched off from it's parent thread now, so I will respond here. Thanks for the replies!<br><div><div>
<div style="margin-left:40px"><br></div><div style="margin-left:40px">Take a look at speech CODECs like linear predictive coding, CELP, SPEEX,
etc. ...<br>
A variant of this digital "vocoder" is used in the GSM baseband
processing that conveys speech over mobile phone networks with minimal
bitrate <br></div><div style="margin-left:40px"><br></div>Oh I never correlated vocoding so directly with the telecom industry, but of course it makes perfect sense that's where the tech would be developed. <br><div><div><div style="margin-left:40px"><br></div><div style="margin-left:40px">Also check out Ray Wilson’s take with a very detailed writeup:</div><div style="margin-left:40px"><a href="http://musicfromouterspace.com/index.php?CATPARTNO=NONE&PROJARG=VOCODER2013%2FVOCODER2013.php&MAINTAB=SYNTHDIY&SONGID=NONE&VPW=1024&VPH=500" target="_blank">http://musicfromouterspace.com/index.php?CATPARTNO=NONE&PROJARG=VOCODER2013%2FVOCODER2013.php&MAINTAB=SYNTHDIY&SONGID=NONE&VPW=1024&VPH=500</a></div>
<br><div>Am I missing something? Ray Wilson's looks like fixed frequency BPFs.</div><div><br></div><div>
<p class="MsoNormal" style="margin-left:40px">If applied to music, probably one thinks of synthesizing singing or some DESIRABLE vocal effect.<span>
</span>I tried this<span style="font-size:10pt">:</span></p><div style="margin-left:40px"></div><p class="MsoNormal" style="margin-left:40px"><a href="http://electronotes.netfirms.com/AES4.PDF" id="m_6330743025372978772gmail-m_739302232685471322LPlnk294295" class="m_6330743025372978772gmail-m_739302232685471322OWAAutoLink" target="_blank">http://electronotes.netfirms.com/AES4.PDF</a></p><p class="MsoNormal" style="margin-left:40px"><br></p><p class="MsoNormal">Inspiring read! I think I'll build that sawtooth phase shifter.</p><p class="MsoNormal"><br></p><p class="MsoNormal">-Colin<br></p><p class="MsoNormal"><br></p><p class="MsoNormal"><br></p><p class="MsoNormal"><br></p><p class="MsoNormal"><br></p>
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</tbody></table><a href="#m_6330743025372978772_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Aug 31, 2019 at 7:25 PM Bernard Arthur Hutchins, Jr <<a href="mailto:bah13@cornell.edu" target="_blank">bah13@cornell.edu</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">
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<div id="gmail-m_6330743025372978772gmail-m_9214907933667589027divtagdefaultwrapper" style="font-size:10pt;color:rgb(0,0,0);font-family:Arial,Helvetica,sans-serif" dir="ltr">
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<p class="MsoNormal">Of courses vocoders have “dynamic poles” (not fixed resonances) – else what is the point?<span>
</span>In the original application (Voice-Coder) the idea was to exploit the redundancy in human speech (10:1 to 50:1 - - said redundancy being the repetition of many very similar “cycles” in time that constitute a particular vowel/phoneme/syllable). Instead
as few as three bandpass resonances might well represent a “frame” of 1/5 a second.<span>
</span>A loss of quality of stored/transmitted speech for a vast reduction of memory required (expensive in the early days). But clearly the resonant frequencies changed with each new frame encoded.<u></u><u></u></p>
<p class="MsoNormal"><br>
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<p class="MsoNormal">If applied to music, probably one thinks of synthesizing singing or some DESIRABLE vocal effect.<span>
</span>I tried this<span style="font-size:10pt">:</span></p>
<p class="MsoNormal"><span style="font-size:10pt"><br>
</span></p>
<p class="MsoNormal"><u></u><u></u></p>
<p class="MsoNormal"><a href="http://electronotes.netfirms.com/AES4.PDF" id="gmail-m_6330743025372978772gmail-m_9214907933667589027LPlnk294295" class="gmail-m_6330743025372978772gmail-m_9214907933667589027OWAAutoLink" target="_blank">http://electronotes.netfirms.com/AES4.PDF</a><u></u><u></u></p>
<p class="MsoNormal"><br>
</p>
<p class="MsoNormal">The “animator” worked through a series of (LFO controlled – see Fig. 7) of POSSIBLE formant frequencies (phonemes both used and unused in a particular language).<span>
</span>It worked - it sounded human!<span> </span>BUT basically like a human suffering from food poisoning!<span>
</span>Lesson learned.</p>
<p class="MsoNormal"><span><br>
</span></p>
<p class="MsoNormal"><span>-Bernie </span><span> </span><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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