For many hobbyists, they should also have a certain understanding of the burn-in. After buying a new headset, they will play some common burn-in music to burn the machine. There are also friends who can use the burn-in software for effective burn-in. But for many first-time friends, there may be a lot of incomprehensibility for the machine. It is often said to use pink noise and white noise to burn the machine. What kind of burn-in method is this?
In fact, although white noise and pink noise are technical terms and do not understand well, they have been away from us for a long time and are part of our lives.
White Noise
Also known as white noise, it is a random signal or random process with a constant power spectral density. In other words, the power of this signal in each frequency band is the same. Since white light is mixed with monochromatic lights of various frequencies (colors), the flat power spectrum of this signal is called "White", this signal is therefore called white noise. In the audible frequency range of the human ear (0～20KHZ), the sound is uniform and the noise with the same energy is called white noise, which is a relatively annoying rustle and contains noise with various frequency components. , Is the continuous noise spectrum. So judging from the graph of the spectrum analyzer, white noise is a straight line in the full spectrum, which is widely used in environmental acoustics measurement.
In contrast, other noise signals that do not have this property are called colored noise. Ideal white noise has infinite bandwidth, so its energy is infinite, which is impossible in the real world. In fact, we often treat flat signals with limited bandwidth as white noise, because it makes mathematical analysis more convenient.
Ideal white noise has infinite bandwidth, so its energy is infinite, which is impossible in the real world. But in real life, we often regard flat signals with limited bandwidth as white noise. White noise sounds like the sound of rain, or the sound of waves hitting rocks, or the sound of wind blowing over leaves. However, people of different ages have different feelings, and white noise has an auxiliary therapeutic effect in medicine. Some experts and scholars claim that “white noise†is actually a sound hint given to us by nature, which can play a role. The role of adjuvant treatment of some neurological diseases can also achieve the effect of comforting the baby.
Pink Noise
Pink noise is the most common noise in nature, and the frequency component power is mostly distributed in the middle and low frequency bands. From the perspective of waveform, pink noise is fractal, and audio data has the same or similar energy within a certain range. From the perspective of power (energy), the energy of pink noise decays from low frequency to high frequency. The curve is 1/f, which usually drops by three decibels every octave. It is often used for acoustic testing. Use pink noise to simulate sounds such as waterfalls or rain.
We can get pink noise by tuning the radio to an empty frequency band with no content, which is the kind of "rustling" sound.
In the logarithmic scale, the energy of white noise is distributed with an increase of 3dB per octave, and pink noise is evenly distributed.
In the linear coordinate, the energy distribution of white noise is uniform, and the distribution of pink noise is reduced by 3dB per octave.
White noise and pink noise are mainly reflected in their power spectrum density, the power spectrum of white noise is uniform, and the power spectrum of pink noise is concentrated.
The new headset can be "burned" with signal sources such as white noise or "burning" software, and it is relatively simple, as long as it is tuned to a non-signal radio station, it can be achieved, and the operation is simple. You can also use the music program in daily use to burn the machine naturally. After two hours of burn-in, stop for a few minutes, let the earphone coil cool down and then continue in the loop. Generally, burn at the normal volume (not exceeding 70% of the maximum volume) for about 48 hours Or longer. And the burn-in needs to increase the volume, and the time should gradually decrease to avoid damage to the earphones. In fact, burn-in is a way to speed up the aging of the earphones and make the internal physical structure more stable. However, if the burn-in is not taken, it will not have much impact. Generally, the earphones can be used for about half a year.
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