http://www.whence.com/minimodem/

        Kamal Mostafa kamal@whence.com
        Software          Electronics Geek Radio Ham
[kamal] Developer
                          BeatNik          KA6MAL
        DebianUbuntu
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minimodem - general-purpose software audio FSK modem  for GNU/Linux
systems

Minimodem is a command-line program which decodes (or generates)     
audio modem tones at any specified baud rate, using various framing
protocols. It acts a general-purpose software FSK modem, and
includes support for various standard FSK protocols such as Bell103,
Bell202, RTTY, TTY/TDD, NOAA SAME, and Caller-ID.

Minimodem can play and capture audio modem tones in real-time via
the system audio device, or in batched mode via audio files.

Minimodem can be used to transfer data between nearby computers
using an audio cable (or just via sound waves), or between remote
computers using radio, telephone, or another audio communications
medium.
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    "I like the Unix-philosophy of simple tools that do their job...
    minimodem has all the boxes ticked."
                - a minimodem user

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Minimodem demos and applications:

  * [video] Original minimodem demo video
      + Try using minimodem to decode the modem data in this video
        yourself! (Hint: maybe use 'pavucontrol')

  * [video] Sarah Rose "Signals Everywhere": Decoding Digital Audio
    Data
      + Excellent demonstration of modem-audio forensics methods and
        tools! "This." -Kamal

  * [blog] Maxime Leblanc: Decoding Audio Modems
      + Good introduction to basic FSK fundamentals.

  * [application] Sega Saturn Save Game Extractor
      + Transmit Sega Saturn save game files as audio. Based on
        minimodem.

  * [video] Kris Occhipinti: "Computer Radio Data Communications"
    video series
      + Nice video series using minimodem to demonstrate
        experimental emergency comms methods.

  * [video] 300 Baud Acoustic Modem Emulation & calling a BBS
  * [video] Hak5 "Alternative Sneaker Nets" (minimodem at 6m12s)
  * [video] minimodem decoding modem data from Arduino
    microcontroller
  * [audio] Freifunk.radio show featuring minimodem (German)

Ubuntu installation:

    sudo add-apt-repository ppa:kamalmostafa/minimodem
    sudo apt-get update
    sudo apt-get install minimodem

Debian installation:

    sudo apt-get install minimodem

Fedora installation:

    sudo yum install minimodem

Source packages:

    git: github:kamalmostafa/minimodem
    tar: minimodem-0.24.tar.gz

Installable binary packages:

    Debian: minimodem (sid)
    Ubuntu: minimodem (PPA)
    Fedora: minimodem

Man page: minimodem(1)

minimodem is Copyright (c) 2011-2020 by Kamal Mostafa
<kamal@whence.com>. License GPLv3+: GNU GPL version 3 or later <http:
//gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.