513a11d454
For non-interactive output (writing to an audio file), generate the
idle output carrier for same duration that the input is idle. Makes
this case generate an output .wav file of just over 1 second duration:
{ echo hello; sleep 1; echo world; } | minimodem --tx -f /tmp/xx.wav 300
minimodem - general-purpose software audio FSK modem Copyright (C) 2011-2016 Kamal Mostafa <kamal@whence.com> 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.