介绍:
There are two different types, active and passive. Active noise-cancelling utilizes a power source to reduce the outside noise and is more effective at lower frequencies.
（消噪）有两个不同的种类，主动的和被动的。主动的消噪利用电源去减少外界的噪音，针对较低的频率更有效。
Sound travels through the air in the form of waves, each with a particular shape. This is where the active noise-cancelling technology comes in.
声音通过空气以波的形式传播，每一种都有特别的形状。这就是主动消噪科技的来源。
It has small microphones that detect the frequencies in a given environment. The digital processor then determines which sound waves are required to cancel the unwanted sound wave and then amplifies it through the headphones.
其中的麦克风用于检测既定环境中的频率。数码处理芯片将决定需要哪些声波去抵消不想要的声波，然后将它通过耳机放大。
To put it simpler. Imagine a positive sound and a negative sound created at almost the same time. These sounds cancel each other out and bring a listener closer to a level of total silence.
简单来说，想象一下有一个正面的声音和一个反面的声音几乎同时产生。他们会彼此抵消，进而为聆听的人带来一种近似于完全安静的状态。
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