Analog data is a continuously varying value collected by a sensor, such as voltage, current, temperature, pressure, and current sounds and images in telephone, fax, radio, and television broadcasts. In an information system, if an analog signal is transmitted in a channel, it is called analog communication. This article refers to the address: http:// The signal waveform changes with the change of information, which is characterized by continuous amplitude (continuous meaning is that an infinite number of values ​​can be taken within a certain range of values). If the signal waveform is also continuous in time, it is called a continuous signal; if the waveform is discrete in time, it is called a discrete signal, but because its amplitude is still continuous, it is still an analog signal. The advantages of analog signals are intuitive and easy to implement, but at the same time, they have serious drawbacks: (1) weak anti-interference ability The electrical signal is interfered by various noises inside the external communication system during the transmission along the line, and the noise and the signal are difficult to separate after mixing, thereby degrading the communication quality. The longer the line, the more noise is accumulated. For example, if you rip a tape or a video tape, the quality of the sound and image will be bad once every time you rip it. The reason is that. (2) Poor confidentiality Analog communications, especially microwave communications and wired communications, are easily eavesdropped. As long as the analog signal is received, it is easy to get the content of the communication.
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