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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Interesting. I hear this in some locations. Very rarely at home but I remember having real problems with it in Banff, Alberta Canada.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Synth-diy [mailto:synth-diy-bounces@synth-diy.org]
<b>On Behalf Of </b>Bernard Arthur Hutchins, Jr via Synth-diy<br>
<b>Sent:</b> 24 April 2021 21:35<br>
<b>To:</b> synth-diy@synth-diy.org<br>
<b>Subject:</b> [sdiy] tinnitus (WAS Lossless synthesizer demos)<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:red;background:#FAFAFA"> </span><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black;background:#FAFAFA"> </span><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif""> </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black">LF Tinnitus ??? </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black">Since the subject of “ordinary tinnitus” (HF; say 5 kHz – 10 kHz) has appeared here as a topic, please
humor me in allowing mention of the “World-Wide Hum” (WWH, sometimes Taos Hum, etc.) which is a mysterious LF hum (like an idling diesel engine in the distance - perhaps 30 Hz to 100Hz – I hear 64 Hz), often 24/7/365, the exact nature and cause of which is
largely unknown. </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black">Few people hear this (perhaps 2%), but observations are confounded by real trucks, refrigerator units,
failing power transformers, etc., as well as (conspiracy directed) entertaining suggestions of government mind-control or underground invasion tunnel drilling, cell towers, etc. Few good audio engineers are hearers and participating investigators. </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black">This Hum is likely an individually generated (internal) artifact – not a real physical sound; a LF
tinnitus. Importantly and diagnostically, various “impulsive” INDIVIDUAL ACTIONS (vigorous head-shake, exhale, grunt) seem to interrupt the WWH for about ½ a second, after which it is found to have ramped back up. This ramp-back-up timing reminds an audio
engineer of AGC, which in turn might suggest actions of protective muscles in the middle ear (supposition here). </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black">For those interested, Dr. Glen MacPherson maintains an excellent website on the WWH: </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black"><a href="https://hummap.wordpress.com/">https://hummap.wordpress.com/</a> </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black">and I have posted on my EN site Webnotes linked here: </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black"><a href="http://electronotes.netfirms.com/ENWN56.pdf">http://electronotes.netfirms.com/ENWN56.pdf</a> </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black"> </span><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><span style="font-size:14.0pt;line-height:106%;font-family:"Arial","sans-serif";color:black">-<b>Bernie</b></span><b><span style="font-size:20.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"> </span></b><span style="font-size:11.0pt;line-height:106%;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
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