Speak FreelyÕs sfspeaker receives the packets on port 2075 and rejoins them into an 8-bit ULAW stream.
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Next the ULAW stream is uncompressed back into an 8-bit raw stream of audio.
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The raw audio is streamed through the digital to analog (D/A) converter (the output device of your sound card).
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The IRLP interface card keys the radio when the audio stream is present (live -- no buffering).