The microphone converts sound into a digital signal. 麦克风把声音转换成数字信号。
After sampling and quantization, the analog waveform is represented as a digital signal that can be filtered and compressed efficiently. 经过采样与量化后,模拟波形被表示为数字信号,从而可以高效地进行滤波与压缩。
词源 Etymology
digital 源自拉丁语 digitus(“手指”),引申为“用数字表示的”;signal 来自拉丁语 signum(“标记、符号”)。合起来 digital signal 字面即“以数字形式表示的信号”。