Which signals are analog signals

Various physical quantities in actual production and life, such as images captured by cameras, sounds recorded by tape recorders, pressure, flow rate, rotation speed, humidity, etc. recorded in the workshop control room are all analog signals. An analog signal refers to a signal whose amplitude, frequency, or phase changes continuously with time.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Analog signals refer to information represented by continuously changing physical quantities. The amplitude, frequency, or phase of the signal changes continuously with time, or within a continuous time interval, it represents the characteristic quantity of the information. A signal that can appear as any value at any instant.

Various physical quantities in actual production and life, such as images captured by cameras, sounds recorded by tape recorders, pressure, flow rate, rotation speed, humidity, etc. recorded in the workshop control room are all analog signals.

In the process of analog signal transmission, the information signal is first converted into an almost "identical" fluctuating electrical signal (hence the name "analog"), and then transmitted through wired or wireless means. After the electrical signal is received , restored into information signals through the receiving device.

Extended information:

The main advantage of analog signals is their precise resolution, which, ideally, has infinite resolution. Analog signals have higher information density than digital signals. Since there is no quantization error, it can describe the true values ​​of physical quantities in nature as closely as possible.

Another advantage of analog signals is that analog signal processing is simpler than digital signal processing when achieving the same effect. The processing of analog signals can be implemented directly through analog circuit components (such as operational amplifiers, etc.), while digital signal processing often involves complex algorithms and even requires a specialized digital signal processor.

The main disadvantage of analog signals is that they are always affected by noise. When a signal is copied many times or transmitted over long distances, the impact of this random noise can become significant. In electricity, these negative effects can be mitigated to a certain extent by using grounded shields, good line contact, and using coaxial cables or twisted pairs.

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