The Research And Design Of Intelligent Broadcast System For Buses

With the rapid development of communication technology,the short distance wireless communication has a promising application widely in many fields.It has the advantages of high reliability,strong anti-interference ability,less restricted by geographical conditions,good safety,convenient construction and flexible installation.The intelligent voice broadcast on buses is a good way to improve the quality of service for the convenience of passengers,increasing satisfaction and comfort of passengers,reducing the labor intensity of the crew,but at present the bus stop function is single,and the driver still need manual operation,so the voice broadcast system increases the part of the function with fast operation and timely correction,finally the system is more convenient,and reduce the driver's job.The bus application system will not only enhance the image,but also grow the benefit of public transport enterprises for the public transport enterprises.At present,there are various ways,for example,one is the use of GPS global satellite positioning system bus station system.Some cities in the United States put into use,there is domestic research and development of such products,the system is powerful and stable,but its investment is expensive,especially in some small cities.Another method is attendant voice shout.Some small cities or towns in our country are short of cost investment and short bus operation course,which is widely used in this way.But such stations require specialized crew to operate with a lot of problems.There is a bus stop system manual button to select the station by the driver.This kind of system of embedded system based on DSP and ARM,the function is inferior to the GPS positioning system of station system,but its function is relatively stable.However it still can not avoid high cost disadvantage.Voice broadcast device is an important part of the bus,and the system achieves the voice data collection,voice station,temperature and humidity measurement,LCD display and other functions.The design develops intelligent broadcast system based on MSP430 microcontroller and anti-collision theory.The system selects hardware and software platform,describes the detail of module design.We uses nRF905 module to complete the transmitting and receiving data through the RS232 serial interface or the host computer and connect module PTUF1 FS completes voice recording function with receiving and transmitting data,at the same time control system will play content,read the corresponding content from the FLASH memory,and decode for decoding playback;then system begins to playback by D/A converters,bandpass filters,high frequency correction circuits,finally the signals are transmitted to end amplifier by the speaker.