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Feb 23, 2018, 08:12 PM
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Miami Mike's Avatar
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Shepard Tone Vario for OpenTX

The Shepard Tone Vario is pretty-much ready and will be released after some of my friends have tested it.

Version #1 was an attempt to create Shepard tones using the limited sound capabilities of the playTone() function of OpenTX Lua, but that didn't work out very well. The latest version uses a set of 100 WAV files that I spent many hours creating using a combination of several tools, including Audacity. This will almost certainly undergo further refinement but I believe it's quite functional in its current form.

Credit for the idea goes to Helmut Stettmaier, who describes it in the March 2018 issue of Radio Controlled Soaring Digest. Please read his article for more information.

Shepard Tone Vario Demo (5 min 54 sec)

Some Shepard tone videos:

The sound illusion that makes Dunkirk so intense (3 min 2 sec)

These are Shepard-Risset Glissandos, rising:

Shepard Tone (5 min 1 sec)

and falling:

Shepard Tones - Falling (2 min 1 sec)

Here's the complete package with instructions for the Shepard Tone Vario.

Last edited by Miami Mike; Nov 29, 2018 at 03:06 PM.
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Sep 08, 2020, 02:50 AM
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pernstig's Avatar
Hi Mike! I stumbled upon your interesting article on the Shepard Tone Altimeter yesterday. Today I have installed the system in my 2 meter electric glider and it works well in my workshop. Will test outdoors when time and weather allow. I am running a Taranis X9E with OpenTx 2.2.4
Sep 08, 2020, 08:05 AM
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Great! Please keep me posted.

Here's a link to the March 2018 issue of Radio Controlled Soaring Digest in case you haven't already found it. Helmut Stettmaier's article is the first one in that issue.
Latest blog entry: I'll be glad when this is over.

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