| Broadcast TV technology can't exist without digital technology in 21 century. D Digital technology has been widely applied to various radio and television programs acquisition, production and broadcast systems. Traditional AM radio, a simple modulation techniques, covering a wide range of transmission distance, as well as portable receivers, and the advantages of cheap, widely used all over the world. But with the rapid development of digital and communications technology, on the one hand, the majority of radio and television media are beginning to provide multimedia messaging services, transmission rich voice, images and information. People can truly feel the quality the advantages of digital programming; On the other hand, AM radio is still in the traditional analog technology stage. The electromagnetic environment for the AM broadcasting has become increasingly worse than before. Therefore, the situation of traditional AM radio has become increasingly difficult. Find a way that can make full use of the AM frequency resources and improve its obvious shortcomings become pursuit of the goal.DRM organizations conform to the needs of the situation, based on digital AM broadcasting ideas, and developed a digital AM broadcasting international standards. The standard covers the LF,MF and HF. The results can be broadcast to FM quality and solve the problem of the decline of signal. DRM can provide high-quality and diverse digital multimedia programs, and thus attracted the eyes of the world.In this paper, I use the software radio theory as the basis and the TMS320C6416 DSP as the core, to design a DRM digital radio signal receiver. The receiver is divided into several modules, including analog front end, A/D/A converter, main processor, external storage, coprocessor, the bus segregation and the power supply. It has powerful real-time digital signal processing capabilities and flexible control function. It provides a powerful support to the preparation and operation of the software... |
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