Definition of Communication
Communication refers to the exchange and transmission of information between people or between people and nature through a certain behavior or medium. In a broad sense, it refers to the use of any method or medium by two or more parties who need information without violating their respective wishes. Accurate and secure transmission of information from one party to another.
Classification of Communication
1. Classified by Transmission Medium
Wired Communication
- Refers to the communication in which the transmission medium is wire, cable, optical cable, waveguide, nano-material, ฯลฯ.
- ลักษณะเฉพาะ: The medium can be seen and touched (open wire communication, cable communication, optical cable communication, optical fiber cable communication).
Wireless Communication
- Refers to a form of communication in which the transmission medium is invisible and intangible (such as electromagnetic waves).
- Examples: Microwave communication, short wave communication, mobile communication, การสื่อสารผ่านดาวเทียม, scattering communication.
2. Classification According to the Signal Transmitted in the Channel
Analog Signal
- A signal where a certain parameter (such as the amplitude, frequency, and phase of the continuous wave, the amplitude, width, and position of the pulse wave, ฯลฯ) can take an infinite number of values and directly correspond to the message.
- Also called a continuous signal.
Digital Signal
- A signal where a certain parameter can only take a limited number of values and often does not directly correspond to the message.
- Also called a discrete signal.
3. Classified by Working Frequency Band
- Long wave communication
- Medium wave communications
- Shortwave communications
- Microwave communication
4. Classified by Modulation
Baseband Transmission
- The signal is not modulated and sent directly to the channel for transmission.
Frequency Band Transmission
- The signal is sent to the channel for transmission after modulation.
- The receiving end has corresponding demodulation measures.
5. Classified According to the Division of Labor and Data Transmission Direction of the Communication Parties
Point-to-Point Communication
- Simplex Communication: Messages can only be transmitted in one direction. Examples include broadcasting, remote control, wireless paging, ฯลฯ.
- Half-Duplex Communication: Both parties can send and receive messages but cannot do so simultaneously. Examples include walkie-talkies and transceivers.
- Full-Duplex Communication: Both parties can transmit messages in both directions simultaneously. Examples include ordinary telephones and mobile phones.
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