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This article mainly shows you "what is the concept of 40db noise reduction in the Internet". The content is simple and clear. I hope it can help you solve your doubts. Let me lead you to study and learn this article "what is the concept of 40db noise reduction in the Internet".

The concept of 40db noise reduction refers to the noise reduction of 40 decibels, indicating that the noise has been reduced to a certain extent, while dB is actually a ratio, a numerical value, a pure counting method, without any unit labeling, and has different names in different fields, so it also represents different practical meanings.

This article operating environment: Windows7 system, Dell G3 computer.

What is the concept of 40db noise reduction?

40db noise reduction: the concept of noise reduction of 40 decibels. It shows that the noise has decreased to a certain extent.

DB (decibel)

DB is a ratio, is a numerical value, is a pure counting method, without any unit labeling.

It has different names in different fields, so it also represents different practical meanings.

Decibel meaning

1. Relative strength

In electromagnetics, dB is defined as the logarithm multiplied by 10 of the ratio of the intensity of a quantity to the reference intensity. Db is not a unit, but a numerical value, which is used to represent the ratio.

Common representation: dB

2. Signal strength

In the field of wireless communication, dB can also be used to measure the communication signal strength of a wireless base station at a location. For example, the communication signal strength of the No.1 wireless base station in room 402 of a hotel is-90dBm, which is defined as the useful signal strength (signal power) of the room.

Common representations: dBm, dBw

3. Gain

In terms of antenna technology, dB is a parameter to measure the performance of the antenna, called gain. It refers to the ratio of the power density of the signal generated by the actual antenna and the ideal antenna at the same point in space under the condition of equal input power.

Common representations: dBi, dBd

4. Significance in other fields

In the field of electronic engineering, dB is used for amplifier gain. The ratio of amplifier output to input is the magnification, the unit is "times", such as 10x amplifier, 100x amplifier. When the unit is changed to "decibel", the magnification is called gain, which are two names of a concept.

The conversion relationship between decibels and magnification in electricity is as follows:

A (V) (dB) = 20lg (Vo/Vi); Voltage gain A (I) (dB) = 20lg (Io/Ii); current gain A (p) (dB) = 10lg (Po/Pi); Power gain above is all the content of the article "what is the concept of 40db noise reduction in the Internet". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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