hellschreiber-processing

A meager attempt at a Feld Hell decoder program, with the end goal of TX/RX in a cross-platform, user-friendly form... Really, just an excuse to learn something new and practice writing code.

Notes about the concept

Receive is 7 scan lines per character, 14 pixels per scan line.

    I   II  III IV  V   VI  VII  
13-14  :   :   :   :   :   :   :   ^  <- 57.14/14 = 4.08ms per pixel
11-12  :   :   :   :   :   :   :   |
 9-10  :   :   :   :   :   :   :   |
 7-8   :   :   :   :   :   :   :   400/7 = 57.14ms
 5-6   :   :   :   :   :   :   :   |
 3-4   :   :   :   :   :   :   :   |
 1-2   :   :   :   :   :   :   :   v
    <======== 400ms ==========>

Compatibility

Only tested on Windows so far. I use Androidomatic Keyer to test receiving messages.

Credits

• Thanks to Frank Dörenberg's Hellschreiber pages on how it all works.
• Uses Processing with
• ControlP5 for GUI controls and
• Minim for audio processing.