[GreenKeys] RTTY engine using SOX and Perl

[steve bennett]

 Jordan,
"fldigi can be remotely controlled via its XMLRPC functionality:"
That is great news. I will look into that.I agree I do not want a GUI if I can do what I need without it.
Thanks for the tips.-Steve AD8CI

    On Thursday, August 26, 2021, 10:55:31 PM EDT, Jordan Spencer Cunningham <js at teletype.net> wrote:  
 
 fldigi can be remotely controlled via its XMLRPC functionality: http://www.w1hkj.com/FldigiHelp-3.22/xmlrpc_control_page.html

I use this for both Tx and Rx in combination with a Volpe board for printing to my machines along with some scripts I wrote and Icecast to automate broadcast of pre-written, scheduled messages. I call it a poor man's TU. Works pretty well for what it is. I need to work out a couple bugs with the tx scripts and even more bugs with the overarching architecture underpinning the automated rx/printing mechanisms, but it functions to my satisfaction 99.7% of the time. It's what I use to produce the Halloween and Santa Tracker broadcasts (gear up for year three of these, by the way-- it's a comin'): https://teletype.net/display/TEL/Internet+Teletype+-+ITTY

There's also minimodem-- a basic text-based (CLI) program that others on GreenKeys have used for similar purpose. Being a CLI-based program, it's very automatable. I tried using it instead of fldigi as it runs much lighter, and I'd rather not have a GUI when I don't need one. However, I didn't have as much success with it. I may need to try again when I have more time.

But it looks like you have built something that seems to work pretty well-- nice and scrappy, a true GreenKeys trait. I copy your test message fine.

-
Jordan Spencer Cunningham
teletype.net | GreenKeys Search Engine: teletype.net/gksearch
SMS via teletype: 385-308-4898 | Email via teletype: tty at nerdology.org


On Thu, Aug 26, 2021, at 4:44 PM, steve bennett via GreenKeys wrote:

Greenkeys,

  Thanks for answering all my questions about RTTY tones.
It was a big help.
Here is what I accomplished today using that information.

I'm attempting to create a command line script for linux that can convert text to RTTY or iTTY tones.
I would have rather used one someone else already wrote but could not find one.
Yes I know GUI programs like FLDIGI and MMTTY can create the tones
but I wanted it to be scriptable so it can be automated.

I started by using an audio editor called GoldWave to create Mark ,Space and Stop tones of the correct pitch
and duration.
mark.wav space.wav and stop.wav
(this step could have been done with sox)

With those basic building blocks I wrote a CSH script that uses SOX to concatenate the tones into BAUDOT tones.

sox space.wav mark.wav mark.wav space.wav space.wav space.wav stop.wav a.wav
(the first space is a start bit)

This creates a.wav with start and stop bits.
Repeat for all the other characters.

Now I have a.wav, b.wav, c.wav........z.wav....etc

Finally I wrote a perl script that used these wav files to convert input text to baudotout wav

cat quickBrownFox.txt | txt2fsk.pl 
Presto! It creates baudotout.wav ready for RTTY or iTTY. consumption

Here is a link if anyone cares to test the result.
45.45 baud, 1.5 stop bits
2295 space
2125 mark

Please give it a try and let me know if you can copy it. 
https://www.dropbox.com/s/dfpuj471rw9r20h/quick%20brown%20fox.wav?dl=0

Thanks,
-Steve 


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