The LED system shall be digitally driven using high-speed pulse width modulation (PWM).
LED系统应采用高速脉宽调制(PWM)数字式地驱动。
By utilizing the LED and light way of the instrument and employing PFM modulation, it can transmit voice from the master of the instrument to measuring point.
该装置利用光电测距仪的光源和测量光路，采用PF M调制，来完成测量主机到测量站的话音通信。
Circuitry involve LED drive circuit, signal modulation circuit, DSP circuit and display circuit.
硬件电路系统包括LED光源驱动电路、信号调制电路、DSP硬件电路、显示电路。
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