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V.32 Modem Datapump |
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V.32 modem datapump implements 9600 and 4800 bit/s QAM modulation and demodulation according to ITU-T V.32 recommendations. Modem uses echo cancellation technics to provide full duplex operation over phone or 2-wire leased line.
V.32 features:
Official ITU-T recommendation V.32 is available at V.32 standard V.32 development test benchCommonly, test bench is used to simplify modem datapump development and simulate modem operation in non realtime mode. Test bench consist from two modem datapumps, channel simulator, generator and receiver of transmitting data or BER tester, command and configuration parser, sample/data read/write functionality, report generator etc.Fully functional development test bench including source codes may be downloaded here V.32 testbench. Though test bench was used for described above modem development, V.32 datapump is excluded from freely available testbench and replaced with simple FSM modem V.23 from SpanDSP packet. Currently, documentation is available at Russian language only, source code comments written at english may be used instead. Modem testbench is designed for MSVC 2008 Express and for Code Composer Studio 3.3 for TI 55XX DSP. Testbench C code is optimized with intrinsics, pragmas and other high level optimization technics. Modem testbench may be easily used at other TI DSP platforms 64XX and 54XX or ported to Blackfin, ARM etc. Here is channel simulator diagram: 
Channel simulator emulate following channel distortions:
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Email: powerdsp@narod.ru |
