Urgent, question about white noise thank you 5

Noise refers to sound that has the same energy at all frequencies. It may not be very easy for you to understand this, so here is a spectrogram of an ordinary song. The song chosen here is "Lemon Tree" by Peter, Paul & Mary.

This song of less than 3 minutes contains a lot of frequency variation, with hardly any of the same passages.

So let's take a look at the spectrogram of white noise:

The sound energy of the whole picture is very uniform at different frequencies, like a solid cloth spread out.

And there's the pink noise that we might have heard:

Although the pink noise is more prominent in the low frequency of the sweet potato, its energy is relatively uniform at all points in time.

Whether it's white noise or pink noise, we all sound like a rustle in a TV set.

Just as white is a combination of all the same energy bands, white noise is a combination of all the same energy bands, and they are so similar in this respect that this sound is called white noise.

Of course, the white noise mentioned above is only white noise in a serious sense, in fact, we now call many sounds with relatively stable energy and no specific meaning as white noise. A lot of white noise comes from nature, like ocean waves, streams, rain, wind, and so on.

At present, the most well-known role of white noise is to help you sleep.

When there are sudden sounds such as footsteps, dog barking, cars whistling by, etc., the safe and comfortable environment is instantly destroyed, and people's spirits are tense, and it is more difficult to calm down this tense mood swing, and insomnia comes.

Although white noise is audible, it does not suddenly raise its sound anywhere, which means that it actually provides a relatively safe and comfortable environment. This is one of the principles of white noise to help you sleep.

Another principle comes from the masking effect in acoustics, when two large and small sounds exist at the same time, the larger sound will mask the smaller sound, which means that people can only feel the larger sound.

Under the effect of white noise (larger), many sudden sounds (smaller) will be masked by it, thus ensuring that the environment is still relatively safe and comfortable.

White noise has a great positive effect on people's physiology and psychology in the field of sound. For example, we are surrounded by noise for a long time in the city without realizing it, which actually makes people more prone to impetuousness. White noise has the effect of regulating people's emotions, reducing impetuousness and making people's mood calmer.

The sound library hopes that the white noise can return to nature, so that people feel as if they are in the real natural environment when listening to the white noise, so the recording of the white noise is all artificial, and it is also from the countryside, which will bring you a more realistic experience.

It may be hard for you to imagine that when you turn on the CD player at home, you can ** the sound of waves, waterfalls, springs, birds and insects... All sounds can linger in your space, and all scenes can loom in front of your eyes.

Answer: 1. White.

Definition of copy noise.

1. White noise refers to noise with equal noise energy in each frequency band of equal bandwidth in a wide frequency range.

2. White noise or white noise is a random signal with a constant power spectral density.

3. In other words, the power of this signal in each frequency band is the same, because white light is a mixture of monochromatic light of various frequencies (colors), so the property of this signal with a flat power spectrum is called "white", and this signal is also called white noise.

4. On the other hand, other noise signals that do not have this property are called colored noise.

Second, the advantages of white noise.

White noise does not increase the noise white noise, but contains all calls of equal frequency. Studies have shown that a stable, peaceful sound stream of monotonous, such as white noise, can filter and disperse noise, helping to reduce noise distractions, which is why it is used to help people relax and sleep.

Definition one: white.

noise, whose self-power spectral density is pn( )=n(constant),-

Definition 2: White noise, the autocorrelation function is rn( )=nδ( For ≠ at any moment, its autocorrelation is zero, and if and at =0, its autocorrelation is an impulse with a strength equal to n. That is, the value of white noise at any given moment is chaotic and uncorrelated.

It is a very useful kind of noise in auditory research, borrowing from the principle of white light formation in optics, the name of white noise has already explained its nature, which refers to the sound energy carried by the frequencies of each equal bandwidth in a wide frequency range.