Coupling refers to the process that energy propagates from one medium (such as metal wire and optical fiber) to another medium.

Difference:

1, different functions

In electronics, coupling refers to the transfer of energy from one circuit part to another.

Filtering is the operation of filtering out the frequency of a specific frequency band in the signal, and it is an important measure to suppress and prevent interference. Filtering can be divided into classical filtering and modern filtering.

2, the working principle is different

Through conductive coupling, energy propagates from the voltage source to the load. The AC part and DC part of the circuit can be coupled by using the characteristic that the capacitor allows the AC component to pass and blocks the DC component. Transformer can also be used as coupling medium, and appropriate impedance matching can be achieved by configuring appropriate impedances at both ends.

Filtering is the operation of filtering out the frequency of a specific frequency band in the signal, and it is an important measure to suppress and prevent interference. It is a probability theory and method to estimate another random process according to the results of observing one random process.

3. Different characteristics

If a group of modules all access the same common data environment, the coupling between them is called common coupling. The public data environment can be a global data structure, a public communication area, a public coverage area of a memory, and the like.

The word filtering comes from communication theory, which is a technology to extract useful signals from received signals containing interference. "Received signal" is equivalent to the observed stochastic process, and "useful signal" is equivalent to the estimated stochastic process.

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