"Well, the phone we're using now uses analog signals for communication, but portable phones require digital signals. If it's urgent, you can use it for a while and then switch to it later."

"Digital signal?" Several big question marks appeared above Qian Zilin's head. What was this?

He knew that analog signals were sounds converted into electrical signals and transmitted through telephone lines.

But digital signal... Sorry, he had never heard of this term.

Ling Yue opened her mouth and thought about how to explain it clearly in brief words.

Finally, he managed to say, "It converts sound into digital signals and transmits them through telephone lines or the Internet, which can improve transmission quality and stability."

Qian Zilin: ...

It was explained, but it also seemed like it wasn't explained.

Ling Yue looked at Qian Zilin, whose eyes were full of confusion, and sighed. It was not that she didn't want to explain, but mainly because this thing could not be seen or touched.

Unlike real objects, Qian Zilin can understand what it is, what structure it has, what materials are needed, and how many steps it can be divided into by just drawing a picture.

After a moment's thought, he continued, "It's a code consisting of two values: 0 and 1. During a call, the voice signal is first converted into a digital signal, then encoded and modulated, and finally transmitted as a digital signal to the destination phone. The receiving end decodes the signal and converts it back into an audio signal."

Qian Zilin suddenly understood and understood: "Oh, the binary method."

Ling Yue nodded, and as they were talking, they arrived at the base. After going through a set of procedures, when they went in to see the real thing, the sun had already slowly set.