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。
The method of direct modulation is: change the ready information to current signal and then inject the LD or LED to obtain the corresponding light signal, thus the idea is source modulation.
直接调制是把要传送的信息转变为电流信号注入LD或LED，从而获得相应的光信号。
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