Basic transmission mode of signal

The basic ways of signal transmission are analog signal and digital signal.

Analog signal transmission: the transmission mode of transmitting information in the transmission medium in the form of analog signals.

Analog transmission is a kind of transmission without considering the content, and it is a way of conducting energy. In the process of transmission, energy will inevitably be lost, and its signal strength will be amplified by the amplifier. In long-distance transmission, its energy needs to be amplified by one level, but its noise also increases, which is called distortion.

Digital signal transmission: a transmission mode in which information is transmitted in the form of digital signals in transmission media.

Digital transmission also needs to amplify the signal during transmission. Digital signal simply recombines and regenerates the received signal by using a mosfet composed of circuits to generate a new signal that completely eliminates attenuation or distortion.

Extended data:

Other data transmission methods:

1. Analog data is transmitted by analog signal:

The traditional telephone system adopts hierarchical switching; The long-distance trunk line adopts frequency division multiplexing transmission mode, that is, carrier telephone.

2. Digital data transmission through analog signals:

Before digital transmission in analog channels, digital signals must be converted into analog signals. Solution: Choose a sine (cosine) analog signal of a certain frequency as the carrier signal to carry the digital signal to be transmitted. The specific implementation method is modulation and demodulation.

3. Analog data is transmitted by digital signal:

The transmitter converts an analog signal into a digital signal through a decoder, and then the received digital signal is restored to an analog signal through the decoder at the receiver.

4. Digital data transmission through digital signals:

Encode data, improve data transmission efficiency, and realize signal synchronization of both parties.

References:

Baidu encyclopedia-transmission signal