Software for Telecoms & Audio
Bell 202 Modem DSP C Code
implements the data pump function of the modem Bell 202. This provides
half-duplex data transmission over 2 wires or full-duplex over 4 wires
at two rates, one 1800b/s and the other 1200b/s, over the telephone network.
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