噪声

• There must be a threshold of thermal noise .
  必有一个热噪声的门限值。
• Ambient noise may come from any direction .
  外界噪声可以来自任意方向。
• The noise stopped, and then began again .
  噪声停止了，但不久又开始了。
• Our second concern is with shot noise .
  第二个要讨论的是散粒噪声。
• The noise of the car died away in the distance .
  汽车的噪声消失在远方。
• The noise of the aeroplane deafened us .
  飞机的噪声使我们耳朵听不见了。
• Receivers must be as noise-free as possible .
  接收机必须尽量做到无噪声。
• W is a zero mean white noise source .
  W是一个零均值的白噪声源。
• Noise immunity is the maximum amplitude of noise .
  抗扰度是最大的噪声幅值。
• Our fifth concern is with modulation noise .
  我们要讨论的第五个问题是调制噪声。