What is "White Noise "?

Overview

 

Generally, it is physically translated into white noise ).

White Noise refers to the noise in which the power spectral density is evenly distributed throughout the frequency domain. Random Noise with the same energy at all frequencies is called white noise. From the frequency response of our ears, it sounds like a very bright "beep" (every eight degrees high, the frequency is doubled. Therefore, the energy in the high-frequency zone is also significantly enhanced ).

White Noise or white noise is a random signal or random process with a constant power spectrum density. In other words, the power of this signal in each frequency band is the same, because the white light is composed of the monochrome light of various frequencies (colors, therefore, this flat power spectrum is called "white", and this signal is also called white noise. Relatively, other noise signals that do not have this property are called colored noise.

 

The ideal white noise has infinite bandwidth, so its energy is infinite, which is impossible in the real world. In fact, we often regard flat signals with limited bandwidth as white noise, which makes it easier for us to perform mathematical analysis. However, white noise is more convenient in mathematical processing, so it is a powerful tool for system analysis. Generally, as long as the spectrum width of a noise process is much greater than the bandwidth of the system to which it is applied, and the spectrum density of the noise process can be considered as a constant, it can be processed as white noise. For example, the thermal and elastic noise have a uniform power spectral density in a wide frequency range, which can be considered as white noise.

When you need to concentrate on your work and there are always complicated sounds around you, you can use these two sounds to mask them. Generally, you can use white noise, while pink noise is a masking material especially for speaker sounds.

 

Pink Noise is also called inverse frequency (1/F) noise, because its energy distribution is inversely proportional to the frequency, or the energy of every octal interval decreases by 3 dB.

White Noise Analysis

He was the new infinite-dimensional Schwartz extensive function theory created internationally in the 1970s S. the researcher Yan Jianan of the application is one of the main contributors to the establishment and improvement of the mathematical framework of this theory, the framework proposed by Dr. Meyer, a member of communications with the French Emy of sciences, is called the Meyer-yan space. He and Kondratiev and other recently published papers have established a complete mathematical framework for infinite-dimensional non-Gaussian analysis. We plan to conduct pioneering research in this area in the future. Since white noise analysis has a profound physical background, it has become more and more profound in quantum physics.

Application

One of the application fields of white noise is architectural acoustics. In order to reduce the noise (such as human conversation) that disperses attention and does not want to appear in the internal space, we use continuous low-intensity noise as the background sound. Alarms for emergency vehicles also use white noise, because the white noise can pass through background noise such as the traffic noise in the city and will not cause reflection, so it is more likely to attract people's attention.

 

There is also a white noise application in electronic music. It is used directly or as the input signal of the filter to generate other types of noise signals, especially in audio synthesis, it is often used to reproduce percussion instruments that have a high noise in the frequency domain, similar to zookeeper.

White Noise is also used to generate an impact response. In order to ensure a balanced effect for concerts or other performances at a place, the p A System emits an instantaneous white noise or pink noise, and monitors noise signals in different places, in this way, engineers can automatically increase or decrease the acoustic effect of a building to adjust the overall balance effect for a balanced sound.

 

White noise can be used for frequency response testing of amplifiers or electronic filters. Sometimes it is used together with a microphone with a flat response or with an automatic balancer. The idea of this design is that the system will produce white noise. The microphone will receive the white noise produced by the speaker, and then perform automatic balancing in each frequency segment to get a smooth response. This type of system is used on specialized devices, high-end home stereo systems, or some high-end car radios.

White Noise is also used as the basis for some random number generators.

 

White Noise can also be used to confuse people before interrogation and may be used as part of sensory deprivation techniques. White noise machine products sold on the market include privacy enhancement devices, sleep guides, and masks.Tinnitus.