A bipolar DC PWM reversible speed-adjusting system is constituted by 80c196 single chip computer for elevator door machine.
以80c196单片机为核心，构成双极式直流pwm电梯门机可逆调速系统。
This paper is about the theoretical and experimental research on the speed feedback control systems of hydraulic elevator using single chip microcomputer.
对液压电梯速度反馈单片机控制系统进行了理论设计和实验的研究。
At present, most elevator audio systems, which are designed by using special audio chip, are far from being flawless.
目前，大多数电梯楼层语音系统都采用专门语音器件，但缺陷多。
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