Difference between analog communication and digital communication

1, different anti-jamming ability: digital communication has obvious advantages over analog communication. Strong anti-interference ability, communication quality is not affected by distance, which can meet the requirements of various communication services, facilitate the use of large-scale integrated circuits, and facilitate the realization of secure communication and computer management. The disadvantage is that the occupied channel frequency band is wide. The anti-interference ability of analog communication is weak.

2. Different systems: Compared with digital communication, analog communication system has simple equipment and narrow occupied frequency band, but the communication quality, anti-interference ability and security performance are not as good as digital communication. In the long run, analog communication will be gradually replaced by digital communication. The analog communication system is mainly composed of user equipment, terminal equipment and transmission equipment. The analog communication system of digital communication is relatively complex.

3. Different confidentiality: Compared with analog signals, digital signals are easier to encrypt and decrypt. Therefore, the confidentiality of digital communication is good. The confidentiality of analog communication is poor. Analog communication, especially microwave communication and wired communication, is easily eavesdropped. As long as the analog signal is received, it is easy to get the communication content.

Extended data:

Conversion between analog signal and digital signal;

Analog signals and digital signals can be converted into digital signals by PCM pulse demodulation, that is, different amplitudes of analog signals correspond to different binary values. For example, 8-bit coding can quantize analog signals into 2 8 = 256 orders of magnitude, and in practice, 24-bit or 30-bit coding is often used.

Digital signals are usually converted into analog signals by phase shifting a carrier wave. Binary digital signals are used in computers, computer local area networks and metropolitan area networks. At present, both binary digital signals and analog signals converted from digital signals are actually transmitted in computer WAN. But the more promising application is digital signal.

References:

Baidu Encyclopedia-Analog Communication

References:

Baidu encyclopedia-digital communication