RadioBanter - View Single Post

March 19th 06, 01:50 PM posted to rec.radio.scanner

On Sat, 18 Mar 2006 13:43:45 +0000, Al Klein wrote:

On Sat, 18 Mar 2006 14:23:34 GMT, wrote:

to get a discussion going on writing some command line decoders
that will take the input from my soundcard and output the characters
for something like ACARS, TTY etc.

Grab an old TTY decoder program and you'll see how it's done ...
pretty trivial, really. The rough part (for me, at least, since I've
never tried it) is getting the sound card to tell you which frequency
it's hearing. But once you have the digital train decoding ASCII is
no job at all (0100 0001 is upper case A - no "decoding" needed), and
decoding Baudot isn't much more complicated (keep the current shift
state in a boolean and look up the character in a table).

Have any web locations for older decoders with source? I've been
looking but cant find the source, realizing its mostly in
visual basic I think. But moving it over to something else shouldnt
be that hard.

TIA
derdogdog