The difference between communication signal and communication signal

There is no difference between the two.

Communication signal refers to communication signal, which refers to information exchange and transmission between people or between people and nature through some behavior or media. In a broad sense, it means that two or more parties who need information use any method and any media to accurately and safely transmit information from one party to the other without violating their own wishes.

The history of human communication is constantly developing. Since two jars were connected by a rope, human beings have been exploring how to use tools for remote communication, such as telegraph, telephone, dial phone, touch-tone phone, mobile phone, SMS, VoIP, FreeEIM and so on. Communication has increased the distance between people and achieved the goal of "global village" to a greater extent.

Extended data:

Classification of communication signals (i.e. communication signals):

1. Analog signal: An analog signal refers to a signal whose information parameters are continuous within a given range. Or in a continuous time interval, the characteristic quantity representing information can be presented as a signal with any numerical value at any time.

For example, in the early first generation mobile communication technology (1G), analog signals were used for communication, and voice signals were directly converted into a series of continuously changing voltage signals.

2. Digital signals: Digital signals refer to signals with discrete independent variables and discrete dependent variables. The independent variable of this signal is represented by an integer, and the dependent variable is represented by one of the finite numbers. In computers, the size of digital signals is usually represented by finite binary numbers 1 and 0, while in electronic circuits, it is represented by high and low levels.

For example, a binary number with a word length of 2 bits can represent four digital signals, namely 00, 0 1, 10 and11; But the binary code of the character "a" in the file is 0 10000 1 (that is, decimal 65), so transmitting the character ASCII is equivalent to transmitting a digital signal waveform corresponding to "0 10000 10".

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