1. Different anti-interference capabilities: Digital communication has obvious advantages compared with analog communication. It has strong anti-interference ability, communication quality is not affected by distance, can adapt to the requirements of various communication services, facilitates the use of large-scale integrated circuits, and facilitates the realization of confidential communications and computer management. The disadvantage is that the occupied channel frequency band is wider. Analog communication has weak anti-interference ability.

2. Different systems: Compared with digital communication, analog communication system equipment is simple and occupies a narrow frequency band, but the communication quality, anti-interference ability and confidentiality performance are not as good as digital communication. From a long-term perspective, analog communications will gradually be replaced by digital communications. Analog communication systems are mainly composed of user equipment, terminal equipment and transmission equipment. Analog communication systems are relatively complex compared to digital communications.

3. Different confidentiality: Compared with analog signals, digital signals are easier to encrypt and decrypt. Therefore, digital communications are highly confidential. Analog communications have poor confidentiality. Analog communications, especially microwave communications and open-wire communications, are easily eavesdropped. As long as the analog signal is received, the communication content is easily obtained.

Extended information:

Mutual conversion between analog signals and digital signals:

Analog signals and digital signals can be converted into each other: Analog signals generally pass The PCM pulse code modulation (PulseCodeModulation) method is quantized into a digital signal, that is, different amplitudes of the analog signal correspond to different binary values. For example, using 8-bit encoding can quantize the analog signal into 2^8=256 magnitudes. In practice, it is often used 24-bit or 30-bit encoding;

Digital signals are generally converted into analog signals by phase shifting the carrier wave (PhaseShift). Binary digital signals are used in computers, computer LANs and metropolitan area networks. Currently, what is actually transmitted in computer wide area networks are both binary digital signals and analog signals converted from digital signals. But what has more application development prospects is digital signals.

Reference material: Baidu Encyclopedia-Analog Communication

Reference material: Baidu Encyclopedia-Digital Communication