ABC logo?

Question

Is the ABC's logo a Lissajous figure? I've been playing with an app that creates these figures, trying to  replicate the logo, but no success.

Phil Allison · Accepted Answer

"Jordan"

** Originally, it was a moving scope screen pattern but has been stylised over the years.

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** The frequency components need to be in a 3:1 ratio and with a particular phase relationship.

Peaks in the lower (horizontal) frequency must coincide with zero crossings of the higher (vertical) frequency.

.... Phil

Don McKenzie · Answer

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pedro · Answer

Yes. You need to try harder.

Jasen Betts · Answer

could be, with the horizontal sweep as a triangular wave and a 3:1 frequency ratio what parameters doe the app allow you to tweak? --  For a good time: install ntp --- news:// - complaints:  ---

Jordan · Answer

A 1:3 ratio results in a curved line with unjoined ends. Same with 1:5,  1:7 etc. Only even numbers for Y result in ABC-like curves with endless  loops.

Phil Allison · Answer

"Jasen Bleatts"  could be, ** NO.  Both are sine waves.  ...  Phil

Jasen Betts · Answer

qliss3d: ok, that was easy to install, but it seems to be missing phase controls :( no activity since 2005 ...

poking round in the source to qliss3d I see you can adjust the phase with the keyboard.

punch in frequencies 1,3,3 and then click the main window and lean on the 'A' key for a while

then move to top slider left a few pixels to make it even better.

OTOH this guy used gnuplot:

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Jordan · Answer

That works, thanks. It's odd they didn't make that control more obvious for dummies like me.

ABC logo?

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