Software for Telecoms & Audio
V.23 Modem DSP C Code
implements the ITU Data Modem function V.23. This provides half-duplex
data transmission over 2 wires and full-duplex over 4 wires, at two rates,
one 1200b/s and the other 600b/s, over the telephone network. Also provided
(optionally) is a half-duplex backward channel of 75b/s which can be operated
independently of the main channel. Duplex channel separation is achieved
by band splitting.
at the sample interface, the code can operate at 8.0kHz and 9.6kHz sample
rates. At the data interface, operation can be in either Asynchronous
or Synchronous mode. In Asynchronous mode, data is transferred with start
& stop bits auto-inserted/-deleted. In Synchronous mode, data is transferred
transparently, with the receiver performing clock recovery on bit transitions.
In both cases, the data can be passed in multiple-bit blocks, and the
nominal clock used is 1200Hz or 600Hz.
#example figures from compiling for the TI TMS320C5000(C55x) DSP processor
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