The group velocity is the speed at which modulated signals would be transmitted. 群速度就是將調制信號發(fā)送出去的速度。
In the picture above you can see a modulated signal driving the IR LED of the transmitter on the left side. 上面圖片中你可以看到一個(gè)調制信號驅動(dòng)紅外發(fā)光二極管的發(fā)射器的左邊。
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