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This section provides an overview for pink noises as well as their applications and principles. Also, please take a look at the list of 10 pink noise manufacturers and their company rankings. Here are the top-ranked pink noise companies as of December, 2024: 1.Alen Corporation, 2.Radio Design Labs, 3.Building Systems Solutions.
Table of Contents
Pink noises are noises whose power density is inversely proportional to their frequency.
It is called pink noise because light with the same frequency component appears pink. It is characterized by a "zing" sound, like the sound of strong rain or a waterfall. Pink noises have a constant energy per octave band and are used as a signal source for various acoustic measurements.
A similar type of pink noise is white noise, which has a constant power regardless of its frequency. It is considered to have a calming effect because it sounds pleasant to the ear. Pink noises are also called "1/f Fluctuations" because their power is inversely proportional to their frequency, and in nature, they are sometimes compared to the tides on a sandy beach.
Pink noises are used as a signal source over a wide frequency range for testing audio products such as amplifiers, speakers, and headphones, as a signal source for testing electronic equipment, and as a sound source for human hearing tests and healing.
Pink noises are also called 1/f Noises because their power is inversely proportional to their frequency. Here, f is the frequency. The general expression for noise broadly speaking is S(f)∝1/f^α.
Note that S(f) is the spectral density, f is the frequency, and α is 0=<α<=2. For pink noises, α is around 1. In this case, the spectral density is attenuated by a factor of 10 in frequency, α x 10dB.
Noise with α around 1 is found in nature, including tidal noise, and has been the subject of much research. Also, α = 0 is white noise, and α = 2 is called red noise.
Pink noises are often used for testing audio products and electronic equipment. Another important use is as a sound source. Because of its high low-frequency content, pink noises, when heard by the ear, have a soothing effect by blocking out external sounds. It is also a pleasant sound because it is close to natural noises that humans can easily hear.
Therefore, it is used in some cases as an environmental sound to improve concentration and productivity. Another benefit of pink noises is its positive effect on sleep. It is said that the brain converts short-term memories into long-term memories during sleep.
Among non-REM sleep, slow-wave sleep, a particularly deep state of sleep, is necessary for long-term memory. Research has shown that acoustic stimulation with pink noises during slow-wave sleep improves memory.
Pink noises can be easily created by using a noise generator, by using an electronic circuit such as a diode, or by using a programming language.
Noise generators include those used in electromagnetic interference EMI tests and acoustic characteristic tests, as well as those built into function generators. The noise generator can generate white noise, pink noises, etc., by selecting the desired type of noise. Noise generators attached to synthesizers can also be used.
To use a noise generator circuit with a zener diode, transistor, or operational amplifier, first create white noise. Then, a power attenuation inversely proportional to the frequency is applied to make pink noises. Power attenuation requires -3 dB/oct, so a circuit called a lag-lead filter is used.
Another method is to use a programming language such as C, Java, or Python. Noise is generated in software using random numbers.
It is common to represent noise in terms of color. These are called "colored noise," and include white, pink, red, brown, blue, violet, purple, and gray. Noise is determined by its frequency components, and noise is represented by the color of light having the same frequency components.
White noise contains all frequencies uniformly and is perceived as a "sough, sough" like the sound of a ⾵ sound or the sound of a low river. Red noise is a noise with a power density that decreases by 6 dB per octave of frequency. Pink noises are between white and red, with a power density of 3dB lower per octave of frequency. It sounds like a "zing," like the sound of rain or a waterfall.
Blue noise is also a noise whose power density increases by 3 dB per octave with increasing frequency. It has a limited frequency range. Purple noise is noise whose power density increases by 6 dB per octave. It has a finite frequency range and is equal to the derivative of white noise.
Gray noise is noise with a power density close to the auditory equal loudness curve. The equal loudness curve is an equal-hearing curve with a large attenuation of power density around 2,000 Hz and a smaller attenuation at lower and higher frequencies.
*Including some distributors, etc.
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Radio Design Labs, founded in the United States, is a manufacturer of precision audio and interface products. The company's paint product portfolio includes amplifiers and preamplifiers, studio monitor speakers for music production, mixing, and mastering, audio interfaces facilitate seamless connectivity between audio equipment and computers, and USB and Thunderbolt interfaces enable high-speed data transfer and robust connections for various devices. The company also develops customized solutions that meet specific requirements and deliver tailored results.
Alen Corporation, founded in 2006 and headquartered in Austin, Texas, United States, is a manufacturer and provider of air purifiers and air quality solutions. The company specializes in producing a range of air purifiers designed to improve indoor air quality in homes and workplaces. The company’s products find applications in residential spaces, offices, and healthcare environments, aiding in the reduction of allergens, pollutants, and odors. The company also provides a warranty on all its products to ensure customer satisfaction.
Founded in 1944, Rion Corporation, based in Tokyo's Kokubunji City, is a precision equipment manufacturer. It specializes in three main sectors: environmental measurement instruments for noise and vibration analysis, medical equipment for hearing tests and hearing aids, and particle counters for semiconductor and pharmaceutical cleanliness measurement. Rion boasts significant market share in Japan, driven by its advanced technology and service excellence. In environmental measurement instruments, it offers noise meters, vibration meters, and frequency analyzers. In 2022, Rion expanded its environmental division by acquiring Norsonic AS, a prominent noise meter manufacturer. The company caters to diverse customers worldwide, including government agencies, research institutions, manufacturing industries, and R&D departments. With eight subsidiary companies (five in Japan and three overseas) and a global agent network spanning approximately 60 countries, Rion Corporation maintains a strong global presence.
Nihon Denkei Co., Ltd, founded in Japan in 1950, is a manufacturer of electronic measuring instruments and systems. The company offers digital multimeters designed for accurate measurement of voltage, current, resistance, and other electrical parameters, a range of digital oscilloscopes for signal analysis, troubleshooting, and data visualization, signal generators, and power analyzers that are used for analyzing electrical power quality and energy consumption. The company has offices in India, Europe, and East Asia.
Mecord Systems & Services Pvt. Ltd, founded in India in 1987, is a manufacturer of precision industrial instrumentation and testing equipment. The company's paint product portfolio includes humidity and dew point meters, moisture in oil meters, CO2 transmitters, metrology instrumentation, and sound and vibration monitors. In addition, we also provide services that include calibration services, monitoring services, and application support. It has associate offices in Bangalore, Delhi, Pune and Vadodara.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Alen Corporation |
23.3%
|
| 2 | Radio Design Labs |
20.0%
|
| 3 | Building Systems Solutions |
20.0%
|
| 4 | KingPo testing equipment Co., Ltd |
13.3%
|
| 5 | RION Co., Ltd. |
6.7%
|
| 6 | Nihon Denkei Co., Ltd |
3.3%
|
| 7 | Mecord Systems & Services Pvt. Ltd |
3.3%
|
| 8 | Gigasense AB |
3.3%
|
| 9 | SleepSpace |
3.3%
|
| 10 | THE E.W. SCRIPPS CO., |
3.3%
|
Derivation Method
The ranking is calculated based on the click share within the pink noise page as of December 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
4 | 50.0% |
|
Japan
|
2 | 25.0% |
|
India
|
1 | 12.5% |
Sweden
|
1 | 12.5% |
