【摘要】 本方案利用带通滤波器把音乐信号分成三个频段,通过精密整流器再得到一直流电平。该直流电平随音乐信号强弱而上下浮动,然后直流电平再与阶梯波做比较,最终使电压比较器输出高电平的时间与音乐信号大小成正比,通过控制可控硅[1]导通时间,以此来调节灯泡亮度。此方案通过Multisim仿真及实际电路得到验证。更多还原

【Abstract】 Music signal can be divided into three frequency bands by using band-pass filters,then through the precision rectifier,it forms the DC current floating up and down with the signal,which can be compared with the staircase.In this way,the voltage comparator output signal is high time proportional to the signal so as to control the turn-on time of the thyristor and adjust the lamp brightness.The program has been simulated by Multisim and verified by the actual lantern circuit.The actual results prove consistent with the theory.更多还原