Difference Between White Noise and Pink Noise

The color of noises is an interesting topic to discuss. The first one named was White Noise due to the resemblance of the power spectrum. Different noises are found out to have different qualities and they are named accordingly. However, except for pink and brown there are other colors too. All of them are not in accordance but are named informally.

To know about them individually, let us dive into some details. In this article, we shall learn the features of White Noise and Pink Noise

White Noise vs Pink Noise

The main difference between White Noise and Pink Noise is the amount of energy they carry within each frequency. White Noise is known to carry an equal amount of energy in total with each frequency. Whereas, Pink Noise is known to carry an equal amount of energy in total with each octave. A doubling frequency is referred to as an octave.

White Noise vs Pink Noise

White Noise is a very steady voice in the background. It comes due to the equal intensity that it carries. It does not refer to any specific signal. Its name has been derived from white light since it possesses similar properties. The samples of White Noises are sometimes sequential in time.

On the other hand, Pink Noise is used for sleep. It is constant in the background, Pink Noise is recommended for deep and peaceful sleep. It is very effective and it feels relaxing. However, the working of Pink Noise and to what extent it helps in sleeping is not yet known. It has low wave filters and also added depth.

Comparison Table Between Pink Noise and White Noise

Parameters of DifferenceWhite NoisePink Noise
Energy ContentContains equal energy per octave.Contains more energy in the lower frequency.
DepthIt is lighter than the Pink Noise. It is deeper than the White Noise.
FrequencyIt has a higher frequency.It has a lower frequency.
OriginThe sound is generated from electronic devices. The sound is generated from nature.
ExampleWhen we connect the resistor to an amplifier. The sound of the waterfall.

What is White Noise?

White Noise is the combination of the different frequencies of sound. In other words, we can say, it is like hearing all the sounds at the same time. It is known to help us sleep. This is because it has a property by which it can hide unwanted sounds. To be precise, their intensities are of the same frequency.

We as well might be curious about the name. There is a name for why this condition is linked with the name of a color. It came from the reference of the white spectrum of light. It is analogous to the same which is a combination of visible wavelengths of light.

When the White Noise is played in the background, it hides and distracts the other unnecessary sounds. This is an interesting feature that it carries. However, the extreme high frequencies can be fatiguing to some ears. However, it is advised not to leave white noise on the whole day or throughout the night. It is not considered a very healthy option.

It is referred to as a signal or a process. However, the signal has constant power at any given point. There is also a term known as noisy white. It is different from the normal one and is also disturbing. The spectral density of white noise is zero.

What is Pink Noise?

Pink Noise is used in acoustics and audio production. It is considered the best choice for this purpose. This is because it can perceive the frequencies on a logarithm scale. Hence it is well related to human perception of sound.

In acoustic measurements, maximum tests are detected to be octaves. Hence, it needs to be tested with equal energy per octave. These criteria seem to match with the features of pink noise. This is the reason pink noise is preferred.

The spectral density for Pink Noise is 1. The equal power octave mentioned earlier is a doubling frequency. Each octave carries the same amount of energy. This is why despite its real frequency, it is perceived all the same. They generally have a deeper noise and is generated in nature.

While we sleep, Pink Noise tends to amplify the power of brain waves. This in turn results in peaceful and deep sleep. It has potential which is as powerful as sleeping aids. It is also proven to calm anxiety. Examples of Pink Noise include heartbeat, waterfall, falling of leaves, rainfall, etc.

Main Differences Between White Noise and Pink Noise

  1. The main difference between White Noise and Pink Noise is their energy content. White Noise contains equal energy per octave. Whereas, Pink Noise contains more energy in the lower frequency.
  2. White Noise is lighter than Pink Noise. However, Pink Noise is deeper than White Noise.
  3. In White Noise the sound is generated from electronic devices. On the other hand, in Pink Noise, the sound is generated from nature.
  4. The frequency creates a distinct difference between the two as well. White Noise has a higher frequency. However, Pink Noise has a lower frequency.
  5. Last but not the least, examples. An example of White Noise is when we connect the resistor to an amplifier. Similarly, an example of Pink Noise is the sound of the waterfall.

Conclusion

White Noise and Pink Noise are referred to as sonic hues. They have different effects on different listeners in different kinds of ways. White Noise is the common one and generally, people come across this idea. However, the other sounds have different characteristics too. White light contains all the frequencies that are audible to us. Color of noises mainly refers to the power spectrum of a noise signal produced.

It basically depends on the two fundamental characteristics. They are waveform and amplitude. Frequency means at what rate does the waveform vibrates per second. Amplitude means the size of the waves or we can say its power.

Reference

  1. https://iopscience.iop.org/article/10.1088/1741-2552/abe399/meta
  2. https://www.jstage.jst.go.jp/article/indhealth1963/31/1/31_1_35/_article/-char/ja/
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