LCD Parameter Values & Flickering

Tips and techniques for Minimoog Analog Synthesizers
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monads
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Joined: Sun Feb 01, 2004 6:34 pm
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LCD Parameter Values & Flickering

Post by monads » Fri Apr 02, 2004 2:47 am

I notice when I turn some parameter values to maximum they flicker. For example on the Glide Rate, cranked up to maximum the value flickers on the LCD rapidly from 255 to 254. Same in the Mixer section, if I turn oscillator 1 to maximum, or some other value it seems to have trouble maintaining that current value. Anyone else notice this? I hope it's just some kind of bug.

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FrankB
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Post by FrankB » Fri Apr 02, 2004 3:31 am

Hi monads,

this isn't a bug (maybe not a feature too), but this is because of some "noise" of the voltage that comes out from the pots.

Any analogue signal (pot) when converted to a digital value gets such kind of noise. So the display has to decide what value to display, if the value is changing (as a result of that noise). One can "debounce" (smooth) the signal to avoid fast flickering, but it remains under some circumstances.

The only solution is to use a so called hysteresis. But this needs additional memory (RAM) for each pot, and additional algorithm ...

Maybe this would be solved later ?!?
Frank

monads
Posts: 478
Joined: Sun Feb 01, 2004 6:34 pm
Location: voyagerland
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Post by monads » Fri Apr 02, 2004 11:31 am

Thanks Frank. Just wanted to make sure this was a design issue and other voyager owners experience the same thing.

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