LinuxDevices.com: Building a Linux/RTAI based software radioApr 21, 2001, 15:57 (1 Talkback[s])
(Other stories by Rick Lehrbaum)
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"You already knew you could use a Linux box to create your own "Internet radio" station that streams MP3s onto the 'net, right? But did you know you could turn your Linux system into a real radio transmitter, using nothing but the system's parallel port as the wireless media interface?"
"Well, don't get too excited . . . because this is really just a very clever way to demonstrate the real-time capabilities of a popular real-time Linux add-on, called RTAI (the Real-Time Application Interface)."
"...The demo software creates a radio carrier in the "long wave" radio spectrum, using a task running under RTAI to turn parallel port data lines on and off at a fast rate. The carrier is further modulated with a lower frequency, in the audio range, to produce music. Now for more detail."
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