Receiving System Of Digital Audio Broadcasting Signal And Its Software Architecture

The shortened form of Digital Audio Broadcasting is DAB, it is originated from Europe for changing traditional broadcasting technology,improving the quality of broadcasting voice and providing the performance of receiving in high speed. In digital state, DAB encodes,modulates and transfers the digitalizational broadcasting audio and multiform data image signal. Because digital signal just has"1"or"0"two states in the course of processing, the character of transferring medium includes noise,nonlinear distortion and etc can't change the trait of digital signal and it is convenient for all kinds of numerical value operation and logical operation. Because of these unique merit of digital technique, it changes the technique run environment of the existent system very much, improves the holistic technical performance index, and attains to run quality and request that the existent analog technique can not implement.Base on the existent digital audio broadcasting technique, author put forward the software architecture structure of digital audio broadcasting signal receiving system and material implement scheme. The architecture structure bases on the software platform of time-sharing operation system and the hardware platform of digit to analog conversion. The digital audio broadcasting signal is received by the signal receiving chip. The special decoding chip decodes it and transforms it to audio stream and correlative data that the system can deal with. The main processor transfers the audio stream to the player of system to play.In the part of realization of system, the project designs hardware abstract layer used to separate software and hardware, adopts C programming language to develop and implement.Finally,we adopt special testing scheme to test and validate the system.