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Koch method to learn Morse

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The Koch method is based on exposing the student to full-speed Morse
from day one. The first lesson starts with just two characters,
played in full speed. The student must "copy" them (i.e. writing them
down or typing them, like in this page). Once 90% of the characters
are correctly "copied", the student can go move to the next lesson,
where just one more character is added.

[0                   ] Hz tone
[0                   ] words per minute
[0                   ] Farnsworth compression (wpm)
[0                   ] % volume
[INS: :INS]

Lesson []

Click or touch any letter to see and listen the respective Morse code
c h a r

Start lesson and type chars below, or Cancel lesson
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Press Start button

The Morse parameters are suggestions that happened to work well for
me. You can play with parameters in this page or in the Web Morse
player.

After lesson 39, there are two "post-training" or maintenance lessons
that you can use to try different speeds, or just not to forget the
Morse code. The option "Post-training: all chars" creates a lesson
with all possible characters guaranteedly included, just like lesson
39. The option "Post-training: mostly letters" reduces the frequency
of punctuation and numeric symbols to better represent the real-world
frequency of characters.

The Farnsworth compression is yet another feature to aid Morse
learning. The default parameters are 8 words per minute (WPM) and 20
Farns, this means that characters will "sound" like 20 WPM the
inter-character spacing is increased so the effective rate is 8 WPM.
If you can only "copy" in 8 WPM (because you can't type or write fast
enough) but can distinguish by ear in higher speeds, the Farnsworth
compression helps to "train the ear" with higher speeds.

Learning morse in a slow rate like 5 WPM and without Farnsworth
compression is considered harmful because the student will have a
hard time later to get used to higher speeds. She would probably have
to re-train at 6 WPM, 7 WPM, and so on until reaching a useful speed
in the 20-35 WPM range.
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