[sdiy] tinnitus (WAS Lossless synthesizer demos)

Jimmy Moore jamoore84 at gmail.com
Sun Apr 25 21:49:20 CEST 2021


>Tensor Tympani Syndrome

This is a revelation to me -- I experience this fairly regularly and never
knew what it was.

On Sat, Apr 24, 2021 at 3:52 PM Richie Burnett <rburnett at richieburnett.co.uk>
wrote:

> I think I've heard about the Tensor Tympani Muscle being implicated as a
> possible cause for this.  It's a muscle that normally contracts to reduce
> the sensitivity of the ear in the presence of loud sounds, (a sort of
> AGC,)
> but the process can malfunction leading to a range of symptoms classed as
> "Tensor Tympani Syndrome".
>
> https://en.wikipedia.org/wiki/Tensor_tympani_muscle
>
> It mentions that muscle contraction produces noise... "Fast twitch fibers
> produce 30 to 70 contractions per second (equivalent to 30 to 70 Hz sound
> frequency)".  Some people hear rumbling if they close their eyes really
> tight, etc.
>
> The Tinnitus discussion is interesting.  I turned 46 last year and just
> started to notice degradation in my hearing and Tinnitus around 10kHz
> particular at night.  I could easily have tried to blame this on the
> excess
> noise produced during the day by my young daughter, or a symptom of too
> much
> caffeine intake in a futile attempt to be able to keep up with her! ;-)
> ...but sadly it probably has more to do with listening to music loud in my
> younger years.  I've also listened to high-frequency sweeps at elevated
> volume from time to time searching for aliasing artefacts.  Something
> which
> was foolish in hindsight and definitely more scientifically and safely
> quantifiable in a spectrogram anyway!  Lesson learnt: Be kind to your ears.
>
> -Richie,
>
>
>
>
> -----Original Message-----
> From: Bernard Arthur Hutchins, Jr via Synth-diy
> Sent: Saturday, April 24, 2021 9:35 PM
> To: synth-diy at synth-diy.org
> Subject: [sdiy] tinnitus (WAS Lossless synthesizer demos)
>
>
>
>
>
> LF Tinnitus ???
>
> 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.
>
> 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.
>
> 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).
>
>
>
> For those interested, Dr. Glen MacPherson maintains an excellent website
> on
> the WWH:
>
> https://hummap.wordpress.com/
>
> and I have posted on my EN site Webnotes linked here:
>
> http://electronotes.netfirms.com/ENWN56.pdf
>
>
>
> -Bernie
>
>
>
>
>
>
>
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