Design and Study of the Automatic Volume Adjustment System for Broadcast System in Metro Cars
With the rapid development of the urban rail transit,people have higher requirements for the acoustic environment in metro cars and the automatic volume adjustment function of the car broadcast system adapted to the noises in car attracts more attention.The sources of noises in metro cars are complex such as wheel-rail noise and human noises which are influenced by multiple factors,unordered and variable and affecting the broadcast effect in metro cars.Before,the metro broadcast volume was adjusted by adopting a fixed volume,therefore when the environmental noise level inside the car is relatively too high,the broadcast information is easily disturbed by noises and cannot be accurately expressed;when the environmental noise level inside the car is relatively too low,the broadcast volume is abrupt and affecting the ride experience of passengers.To solve this problem,this article adopts the modular design method,proposes a design scheme of automatic volume adjustment systerm for broadcast system in metro cars,introduces the principle and the division of functions of the system and mainly analyzes the hardware and software design.Finally,it's verified by the tests that with a good dynamic adjustment effect,this system can improve the auditory comfort of passengers.
NETL
NSTL
万方数据
维普
