MORSE

(page last modified on January 26,1997)

This program serves the study of the INTERNATIONAL MORSE ALPHABET (as given in GROLIER: Book of Knowledge, 1964 ). The code is presented visually and acoustically via the PC-speaker.

user interface

main features

• Single Character Mode: click a character button (or click the small window for a random character)
• Typing Mode: type text, other window displays code + sound
• Morsing Mode: use keybord for morsing, other window shows decoded text + sound
• change sound frequency and signal speed
• REPLAY option: replays the typed text
• REPLAY FILE: play any text file
• configuration file: modify start-up sound frequency, signal speed and length of pauses

symmetry in the Morse code

It is possible to use symmetry relations in the learning process of the Morse code. Instead of learning the 26 letters you then only need to learn 15.

I consider two symmetry relations, namely the MIRROR and the INVERSION. The MIRROR reverses the order of dots and dashes and the INVERSION changes a dash to a dot or vice versa. If you have a look at the list below you will understand how the codes on the left side are related to the ones on the right.

  MIRROR RELATION
 1                      .-  A    N  -.
 2                    -...  B    V  ...-
 3                     -..  D    U  ..-
 4                    ..-.  F    L  .-..
 5                     --.  G    W  .--
 6                    --.-  Q    Y  -.--

  INVERSION RELATION
 7                       .  E    T  -
 8                      ..  I    M  --
 9                     .-.  R    K  -.-
10                    .--.  P    X  -..-
11                     ...  S    O  ---

  REMAINING LETTERS
12                    -.-.  C
13                    ....  H
14                    .---  J
15                    --..  Z

Release Notes
- released January 27, 1997: download MORSE (45Kb)