Design And Implementation Of Civil Aviation Digital Audio System

With the rapid development of science and technology, civil aircraft is improved inthe speed, height and distance. At the same time, The communication requirements ofaircraft interior and between aircraft and ground are constantly improved and perfected,but also the reliability, effectively, response speed of aircraft audio system are directlyaffect the performance and safety of flight. Audio system is the audio processing centerof the civil aviation. It is intergrated by the signals of communication, navigation,monitor and alarm system on the aeroplane. It realizes multi-audio mixing, audiowarning and volume regulation.Currently, audio systems used on the domestic civil aviation are almost importationand there is no mature homemade system in China. In order to answering the call of thestrategy that developing civil aviation, research on the homemade audio system isimperative. Based on the goal, the thesis presents the design, function and performanceof an civil aviation digital audio system, lays the foundation for designing the real audiosystem in the future.This thesis first briefly describes the project background, development status andtrend of theresearch, raises the research value and significance. And then the maintechnical characteristics of this project are introduced, mainly ARINC429bustransmission technology, voice acquisition technology, digital audio mixing technologyand software reuse technology. Based on these techniques, the digital audio system isdesigned, including implementation plan, working principle, hardware and softwareinterface. Next, the thesis elaborates the hardware and software realization of the system,especially in software realization, including software requirement analysis, softwarearchitecture design, detailed design and implementation, software Test. The softwaresystem adopts layered architecture, and through the Singleton, Oberserver and otherdesign patterns to achieve, so that the software system has a good ability to adapt to thechanging needs and easy expansion. At the same time, this thesis also gives severalimportant reuseable modules code realization. Finally, the functional and performance testing methods are provided.The digital audio system is passed the test and consigned to the consumer. TheARINC429bus transmission, digital audio mixing and the layered design technologiesthat accumulated in the research can be used for reference in similar system.