[GreenKeys] RTTY engine using SOX and Perl

Thu Aug 26 22:55:10 EDT 2021

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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