Software for Telecoms & Audio
V.21 Modem DSP C Code
implements the data pump function of the ITU Modem Recommendation V.21,
which provides full-duplex data transmission at rates of up to 300b/s
over the telephone network. Duplex channel separation is achieved by band
at the sample interface, the code can operate at 8.0kHz and 9.6kHz sample
rates, tx and rx sample transfer being simultaneous. 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, the nominal bit clock being 300Hz.
- #example figures from compiling for the TI TMS320C5000(C55x) DSP processor
Availability: NOW - sale is under licence - integration support offered