<div dir="ltr">speaking of back in the day... don't forget Jim Patchell's vocal filter (<a href="http://www.noniandjim.com/Jim/synthmodules/vocalfilter.html">http://www.noniandjim.com/Jim/synthmodules/vocalfilter.html</a>). check out the picture of the PCB - to me it is an inspiration and a thing of beauty, but it explains why some folks might want to do it in software! really should build mine someday...<div><br></div><div>b</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Aug 31, 2019 at 10:25 PM Bernard Arthur Hutchins, Jr <<a href="mailto:bah13@cornell.edu">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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<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>
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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>
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<p class="MsoNormal"><a href="http://electronotes.netfirms.com/AES4.PDF" id="gmail-m_6487360089769108638LPlnk294295" class="gmail-m_6487360089769108638OWAAutoLink" target="_blank">http://electronotes.netfirms.com/AES4.PDF</a><u></u><u></u></p>
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<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>
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<p class="MsoNormal"><span>-Bernie </span><span> </span><u></u><u></u></p>
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