Miami Mike's blog archive for February, 2018 - RC Groups
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Archive for February, 2018
Posted by Miami Mike | Feb 23, 2018 @ 08:12 PM | 939 Views
This is my first attempt at implementing a Shepard Tone Vario with an OpenTX Lua script. Generating optimum Shepard Tones is difficult due to the limited sound capabilities of OpenTX Lua, such as the ability to play only one tone at a time and no way to control its relative amplitude. This represents the best compromise I've found so far and I haven't yet had an opportunity to try it in flight.

It's actually a very short script but it represents a lot of experimentation and I don't consider it ready for prime time yet.

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 for OpenTX, First Attempt (1 min 46 sec)


A video about Shepard tones:

The sound illusion that makes Dunkirk so intense (3 min 2 sec)
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Posted by Miami Mike | Feb 01, 2018 @ 04:49 PM | 2,446 Views
Here's a simple improvement to the volume control setup I described in my previous blog post, which is a way to put your volume control on one of your potentiometers and confine its range to within your chosen upper and lower limits. The need to do arithmetic is now gone, plus there's a way to set the detent center position of the control to the "perfect" volume setting that's not too loud and not too soft.

If you haven't already guessed, the solution is to use a 3-point curve.

The first step is to create the curve. In this example I'm using Curve 32 and initially setting the three points to -100%, 0%, +100%:



The Special Function used is the same as in the previous setup:



But you can use a mix instead of an input if you like:

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