Design Of Digital Car Audio System

Car audio system is one of the few entertainment equipment inside the car.A superiorperformance, complete functions of the car audio system can effectively relieve the fatigueof driver and the regulation of boring driving atmosphere.Car audio system includes thefollowing parts: the audio portion, power amplifier and sound reduction part etc. Alongwith the automobile technology innovation, car audio system technology also obtainedspan type develops: With that the cassette type music player passed away and advancedlarge capacity Mp3player took his place; introducing the audio processing module, it couldbe a variety of audio output, to meet different requirements of users.Our research aimed at improving the capacity of reception, reducing the powerconsumption of system, vibration and sound processing several aspects, which has animportant meaning to improve the performance of the car audio system, satisfy users,requirement.The topics are divided into three parts.The first one is study working conditions of thecar audio system and determining module parameters and peripheral circuit of eachhardware on the system; The second one is design control software of the system,according to the control requirements; The last one is System test for various functionsand make corresponding improvement for the system problem.Based on analysis of shortcomings of the car audio system and implementation of thesystem, building block design is selected. the module circuit schematic diagram and circuitsimulation was constructed in Protel99SE, rendering system schematic diagram anddesigning the PCB with Protel99SE software.The system software to a great extent determine the stability and convenience of thesystem operation. memory software: whether the system automatically fall electricity ormanual shutdown, the system can automatically will set the parameters of the user saved,for the next turned on the system automatically calls; The radio filtering software: filteringsoftware could simplify system peripheral filter circuit, also can match with filter circuitcompleted filter, and improve the performance of the radio; Sound processing software,control the output of the sound system of loudness, balanced, high and bass etc, to bringgood listener hearing enjoy.After many tests, the system runs stably, each function index comply with the relevantrequirements. This stereo system has been widely used in engineering vehicles and police electric vehicles.the feedback information from the users is good.