The Design Of Digital Transmission Characteristic System On Virtual Instrument

Test the error code and voice channel quality are very important to analyse the performance of digital transfers system. Combined with a digital transfers characteristic analyzing and test device item, this paper accomplishes the software design for error code analyzing module and voice channel characteristic testing module by Labwindows/CVI8.1 virtual instrument software exploitation flat.It is presented the research background and actuality, and discuss the theory of digital transfer analyzing testing, which provides the theory foundation for latter design of software and hardware. Combining with the performance request of error code performance analyzing module and voice channel characteristic testing module, the collectivity scheme and the accomplish of software and hardware of different modules is designed. It is mainly presented two modules'software, includes the design and accomplish of driver, softpanel, data analyzing program and data storage program. The validity of the software programme is validated by the testing result.The design of digital transfer system based on virtual instrument not only keeps the traditional function but also makes the system could be controlled by computer, so it has engineering application value.