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The Fred Fish Collection 1.5
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ffcollection-1-5-1992-11.iso
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ff175.lzh
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SendMorse
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Readme
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1989-02-04
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SendMorse is a little program I kinda "whipped up" for 2 purposes:
1. Learn more about the audio.device (translate: learn something,
*anything* about the audio.device)
2. Practice my very ailing Morse code.
Thus, here it is in its glorious entirety. (Gag). Note that it's
very heavily based on Rob Peck's "audio.c" from Chapter 8 of his book.
Very heavily.....
For those who think I have a weird Makefile -- not ALL of us can have
hard disks. This make works very quickly as it throws everything into
ram:. Note the odd location of c.lib. I have c32.lib on my SYS1 disk,
so I had to put c.lib on my work disk....
To use it: say "SendMorse [-sendrate] <filelist>". It will send the
files in the file list at the given word rate. Default is 5.
Joe Larson (that's still me -- joe@dayton)
November 12, 1988
Golden Valley, Mn.
-------------------Little Notes Follow Hereafter----------------------
A few little notes concerning timings for those who want to fiddle...
There are a few items that may be worth fiddling with.
1. The wave form. I used a short sine wave sample that took me
about 20 seconds on my calculator. However, it clicks a
little at the start of each dit or dah. I don't know why.
I hope someone tells me.....
2. The MORSE_PERIOD value. This defines the period of the sample.
(See the discussion on the audio.device for a definition of
this.) Higher values mean lower frequency.
3. The calculations for ditlength, ditcycles and dahcycles. I
decided that I didn't want longer dits and dahs at slower
speeds but would just add more spacing between letters and
words. Thus, ditcycles is a constant and dahcycles is
3*ditcycles. You may want to fiddle with these, but I
think it works out well.
Ditlength, though, was originally how long a dit was supposed
to be. And I was using a ditlength pause between dits and
dahs and 3*ditlength between letters. I have a constant
defined somewhere that is the number of ditlengths between
words (currently 6). This item is in 20 millisecond
increments, as that's what the Delay() function *seems* to
use.
Because of all this, the sendrate appears to be maybe a
little higher than you ask for. That is, the default of 5
WPM on a 20 character sample SHOULD take about 48 seconds
but seems to be a little closer to 35 or 40. You can add a
little fudge factor if you like -- I'm not too concerned
about it.....
4. Channel allocation. I only use one channel. I should probably
have used Rob's "GetAnyStereoPair" rather than just grabbing
a single channel, but that's the way it goes.