The Design And Implementation Of A Car Audio System

With steady and rapid development of auto industry and continual strong market demand in recent years, car multimedia audio system has won more and more attention and recognition by the market, becoming an indispensable part of car. Traditional car cassette player has been developed into a more comfortable, safer, more convenient car multimedia audio system, functional diversification and personalized enjoying will be the trend of development. Therefore, how to design a high quality car multimedia audio system, and be in line with the constantly changing market demand, is the practical problem in front of us.This paper first analyzes and studies the research background, present situation and future development trend of car multimedia audio system in depth to clarify the purpose and significance of research; Later, based on the relevant principle of audio system, focus on digital audio signal processing and implementation method, digital filter design, ear auditory characteristics and acoustic evaluation of the audio system; Then, through comparing and evaluating six function modules' solutions of audio system, setup a set of more cost effective and high quality car multimedia audio system architecture; Since then, on the basis of the traditional sound effect design, using DSP audio signal processing technology, especially for the shortcomings and existing defects of current practical application in car audio system, specially design the car audio algorithms and rebuild the acoustic stage field, such as automatic gain compensation, audio gain equalization and management mechanism, virtual channel design, effectively improve the hearing comfort level in the car; After that, verify each functional module and test the audio performance, make the whole system meet the standards and requirements of automotive electronics; Finally, summarize the main tasks and innovation points of the paper, prospect the further design and development direction of car multimedia audio system.This topic is sourced from the enterprise's practical project, aimed to design a platform of car multimedia audio system for original auto market, provide a set of complete audio system solution, especially for complex and changeful situation in the car, design special sound effects specifically for the car is the innovation of this paper. Six key problems should be solved as follows:How to comprehensively analyze each functional module of audio system in the market and build the best cost performance car multimedia audio system platform? On the basis of traditional car audio processing system, how to compensate effectively to enhance hearing comfort level for users under car random interior noise environment? With growing multimedia audio access, how to balance audio gains effectively, avoid voice mutation during listening? How to formulate a high efficient audio source management mechanism, improve users' operation comfort level; Ordinary car has four speakers system, how to cost down by using virtual channel technology, build sound stage similar to luxury car with more speakers? How to tune the most suitable audio effects in the car?The car multimedia audio system designed in this paper, which applied in current developing products gradually. Not only optimize the traditional sound effects, but also design and implement the car specialized sound effects, fully exceed the users' expectations. Verified in the car, this audio system improves the hearing effect and comfort level effectively.