Application of analog signals in modern communications Basic fields of communication networks Voice communication: In telephone networks, analog signals play a key role. By converting human voice into analog signals and transmitting them to the receiving end through transmission lines, real-time voice communication can be achieved. Although digital communication is now widely used in the voice field, analog voice communication is still used in some specific traditional communication systems or scenarios with extremely high real-time requirements, such as some internal communication systems, old fixed telephone lines, etc. https://www.renkeer.com/analog-signal/