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以MSP430F149单片机为控制芯片,主要通过噪音检测电路和音频放大电路,寻找地铁广播的空闲时段,采集地铁车厢内的环境噪声,A/D转换后的噪音经音频放大电路放大,适当地控制地铁车厢内的广播音量,实现在地铁噪声环境下自适音量调节控制。该系统采用TPA3112D1音频放大器、LM358双运算放大器,性能良好,适应能力较强。实验结果表明,该系统实现了音量自动调节,适应环境噪声能力良好,性价比较高,应用较为广泛。
MSP430F149 single-chip microcomputer as the control chip, mainly through the noise detection circuit and audio amplifier circuit to find the free time of the metro radio to collect the ambient noise within the subway car, A / D conversion of the noise amplified by the audio amplifier to properly control the subway car Within the broadcast volume, to achieve adaptive volume control in the subway noise environment. The system uses TPA3112D1 audio amplifier, LM358 dual op amp, good performance, strong adaptability. The experimental results show that the system can automatically adjust the volume, good ability to adapt to environmental noise, high cost, and is widely used.