一、噪声及其重要性在通讯系统中一般将不是所要获得的讯号通称为噪声。例如,在雷达系統中,讯号由发射机发射以后,讯号电波經所欲探测之目的物反射后,为接收机所接收。除去讯号外,接收机同时也接收其他电能,这些非所欲获得的讯号,統称为噪声。又例如,在普通广播收音机中,除去收得广播节目外,收音机中所发出的其他声响,亦統称为噪音。又例如,在紡織車間中互相谈话,谈話为所需訊号。然而由于車間的机器等其他声 First, the noise and its importance In the communication system will not be generally obtained by the signal known as noise. For example, in a radar system, after a signal is transmitted by a transmitter, a signal wave is reflected by a desired object to be detected by the receiver. In addition to the signal, the receiver also receives other power, these undesired signals, collectively referred to as noise. As another example, in a regular radio receiver, other sounds emitted by the radio except for receiving radio programs are also collectively referred to as noise. As another example, talking to each other in a textile workshop, talking to the desired signal. However due to other machines such as workshop sound