随着现代科学技术的发展,“信息”这个词出现得越来越频繁了。什么是“信息”呢?信息是对接收者来说预先不知道的知识内容。例如天气预报,向人们告知明日是晴、是阴还是雨,它对收听者来说就是信息。信息必须传输出去才有意义。为了传输信息,需要把它载于某种物理量中,才能使它表现出来,被接收者感觉、认识、检测和处理,这种载有信息的物理量统称为信号。人们常把信息载于光、电、磁 With the development of modern science and technology, the word “information” appears more and more frequently. What is “information”? Information is the knowledge content that the recipient does not know in advance. Such as the weather forecast, to tell people tomorrow is sunny, it is cloudy or rain, it is the message to the listener. Information must be sent out to make sense. In order to transmit information, it needs to be contained in some kind of physical quantity, so that it can be manifested, perceived by the receiver, and detected and processed. Such information-carrying physical quantities are collectively referred to as signals. People often put information in light, electricity, magnetism