2 sentences

1. 模拟信号已经逐渐被数字信号所取代。

   mó​nǐ xìn​hào yǐ​jīng zhú​jiàn bèi shù​zì xìn​hào suǒ qǔ​dài.

   Analog signals have gradually been replaced by digital signals.

   Source: Dong Chinese Dictionary

2. 模拟信号经过量化处理后变成数字信号。

   mó​nǐ xìn​hào jīng​guò liàng​huà chǔ​lǐ hòu biàn​chéng shù​zì xìn​hào.

   Analog signals become digital signals after quantization.

   Source: Dong Chinese Dictionary