To achieve the dynamic adjustment of the broadcast volume, the adaptive control system based on ambient volume for broadcast volume is designed. The system takes MSP430 single chip computer as the controller,and collects the ambient noises in the hall through noise detection circuit. The internal A/D converter in MSP430 is used to transform the ambient noises into digital values, and then calculate the average noise. According to the average noise,the dividing resistors are switched over by the volume control circuit,and the adaptive control of the broadcast volume under dynamically varied noisy environment is realized. The tests indicate that the system is simple in structure and offers high cost effectiveness,the adaptive control effect of broadcast volume is remarkable;the broadcast transmission rate is guaranteed,and both the passenger comfort and energy saving are satisfied. The system has good application and promotion values.%为实现广播音量的自动调节,设计了基于环境噪声的广播音量自适应控制系统.系统以MSP430单片机为控制器,通过噪声检测电路采集大厅内的噪声信号,利用MSP430片内的A/D转换器将其转化为数字量并计算平均噪声;根据处理后的平均噪声,并利用音量控制电路切换分压电阻,实现了广播音量在动态多变噪声环境下的自适应控制.试验表明,系统结构简单、性价比高,对广播音量的自适应控制效果显著,能在保证大厅广播传播率的同时兼顾乘客的舒适度与节能性,具有良好的应用推广价值.
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