The 1. amplifier only amplifies the signal and suppresses noise and interference.

2. Repeater plays the role of signal forwarding, equivalent to the role of sound conduit, which can not only forward data, but also carry out conversation and application services.

Second, the principle is different.

The 1. amplifier is actually an analog Fourier transformer. The output of the amplifier is DC voltage, which is proportional to the signal amplitude of a specific frequency (parameter input frequency) in the input signal.

Other frequency components in the input signal will not have any influence on the output voltage.

2. The repeater is designed to enhance the network signal, so that it can be transmitted further.

Due to the influence of transmission line noise, digital signals or analog signals carrying information can only travel a limited distance.

Third, the application occasions

1. amplifier is a device that can amplify the voltage or power of the input signal. It consists of electron tubes or transistors, power transformers and other electronic components.

Amplifiers are used in communication, broadcasting, radar, television, automatic control and other equipment.

2. Repeater is a device widely used in computer network transmission speed and wireless Internet access.

Both devices are used for network extension and range expansion, but the application occasions and principles are completely different.

References:

Baidu encyclopedia-amplifier

Baidu encyclopedia-repeater