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Pink noise is a random signal, filtered to have equal energy per octave. In order to keep the energy constant over octaves, the spectral density needs to decrease as the frequency (f) increases. This explains why pink noise is sometimes referred as "1/f noise." In terms of decibels, this decrease corresponds to 3 dB per octave on the magnitude spectrum.

For the human auditory system - which processes frequencies logarithmically - pink noise is supposed to sound even across all frequencies, and therefore best approximates the average spectral distribution of music.

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In healthcare applications, pink noise is used to treat hyperacusis, an increased sensitivity to normal environmental sounds, or to mask tinnitus, a ringing in your ear occurring without any stimulus.

in the CD-quality version of our pink noise sample: clicking the down arrow next to the playback button will trigger a high quality .wav file download.in longer durations: download our 15-minute pink noise track in mp3 format. It starts and stops with a slow fade in / fade out, which is ideal for healthcare use.in higher sample rates: check out our High Definition Audio Test Files page.in a real stochastic white noise generator: take a look at the wavTones.com Generator.to continuously play white noise from your browser: have a listen to the myNoise Pink Noise machine.Our pink noise sample file has been generated using wavTones' professional grade Pink Noise Generator.

This section will largely focus on the details of pink noise as it is one of the more popular forms of sound therapy. There have not been studies proving that pink noise is the optimal form of broadband noise for hyperacusis therapy. However, for reasons that will be explained below, its frequency characteristics make it a reasonable choice.

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White noise is commonly used for tinnitus masking and masking of unwanted sounds to aid with sleep. It is the simplest noise to generate as it simply a sequence of random numbers. However there are several reasons why pink noise is commonly chosen over white noise for hyperacusis therapy.

From the graph above you can see that the high frequency energy of pink noise is lower than that of white noise. Pink noise contains the same total amount of energy within each octave. Thus the total energy between 1 kHz and 2 kHz is the same as the energy between 2 kHz and 4 kHz. With white noise, the energy between 1 kHz and 2 kHz is equivalent to just half of the energy between 2 kHz and 4 kHz.

For those who have severe hyperacusis, even pink noise can be irritating at very low volumes. Low pass filtering can be employed in early stages to reduce high frequency content further. One popular pink noise treatment uses low pass filtering of pink noise starting at roughly 5 kHz which yields a softened pink noise perhaps more similar to analog generated pink noise. Further reduction of high frequency components can be found by using brown noise. With brown noise, each octave contains half of the energy as the octave below it. Brown noise is far easier to tolerate and resembles the deep roar of a waterfall. Brown noise, however, does not stimulate the higher frequency regions of the auditory system to the same degree.

Below are samples of the broadband noise described in the previous sections. Pink noise is most commonly recommended for hyperacusis treatment. White noise is simpler and contains more high frequency energy but those with hyperacusis can find it to be unpleasant. Brown noise is more pleasant but is not generally used for hyperacusis, perhaps because it does not contain as much high frequency energy as pink and white noise.

MP3 compression of an hour long pink noise file is a helpful way to minimize disk space but it must be done carefully. The concern with MP3 compression on pink noise (and brown noise) is that the compression algorithm will filter high frequency energy and will also cause changes in content across all frequencies. The following will show that MP3 compression of pink noise can be OK if done carefully.

As hearing for most rolls off significantly by 16kHz, cutoff frequencies of 19kHz and above are reasonable. A quick inspection of the graph above also shows that frequency content throughout the rest of the spectrum is not significantly enhanced or reduced before the cutoff. As a result, the 256 kb/s stereo (128 kb/s mono) MP3 can be considered high quality pink noise and is equally as effective as the original file. Using MP3 compression, the file size of an hour of pink noise is more manageable:

Clearly youtube generally does not provide ideal pink noise. Only video #10 is close to being a high quality source. Whether or not these differences result in a difference in treatment effectiveness is unknown.

Equalizers are a common way to knock down high frequencies that may cause discomfort. Looking at pink noise that has gone through an equalizer is a good way to see exactly what common multi-band equalizers do to the frequency content of an audio file. Below is the equalizer settings set in iTunes in order to reduce the high frequency content of ideal pink noise:

The frequency content in the filtered region is not ideal. Keep in mind that when pink noise goes through headphones or speakers, there will be additional fluctuations in the frequency response. Pink noise will never be ideal.

You may have heard of white noise. The steady, static-like sounds from it can drown out disturbing noises and help you sleep better. But have you heard of pink noise and brown noise? Growing research shows that these lesser-known color noises can also help calm you or improve your sleep quality.

Pink noise uses a consistent frequency, or pitch, to create a more even, flat sound, like a steady rain, wind rustling through trees, or waves on a beach. Its added depth and lower waves filter out higher sounds. As a result, you hear more relaxing, lower-frequency sounds.

Blue noise. Its power increases as the frequency goes up. Blue noise sounds slightly shriller than pink and white noise. Imagine the hissing noise you hear when a water spray is turned on.

White noise is equally spread across the sound spectrum, representing all audible frequencies at the same intensity. Because of that, many people find it hard to listen to when falling asleep because they get startled hearing high-pitched noises or heavy bass sounds. So, how does white noise help you sleep? According to this study, others find these frequencies relaxing because they block out distracting and unwanted sounds.

In this study, researchers found that those who listened to steady pink waves saw an increase in stable sleep. This is because pink noise may have the ability to reduce brain waves, which allows you to fall asleep faster. This color noise is a preferred method by many because it is deeper than white noise, but not as deep as brown.

According to Popular Science, those who suffer from tinnitus (constant ringing in ears) prefer pink or brown noise due to the lower frequencies. White noise can be aggravating to those with sensitive hearing because the high frequency sounds are more intense, making it harder for the person to fall asleep.

I listened to both samples a few days after I mixed them. The version mixed with pink noise sounds unbalanced to me. The vocals are buried behind the instrument tracks. The drums are too quiet and the bass synth is too loud.

To determine what channels are outputting what frequencies, you would send pink noise thru the factory system. If you do not have a test CD with pink noise, you can download a wav file full of pink noise here.

Pink (1/f) noise is one of the most common behaviours of biosystems. Our present paper is devoted to clarify the origin of this interesting phenomenon. It is shown that the stationary random stochastic processes under self-similar conditions (as we have in living objects) generate pink noise independently of the kind and number of variables.

Since equal-loudness curves depend not only on the individual but also on the volume at which the noise is played back, there is no one true grey noise.[1] A mathematically simpler and clearly defined approximation of an equal-loudness noise is pink noise which creates an equal amount of energy per octave, not per hertz (i.e. a logarithmic instead of a linear behavior), so pink noise is closer to "equally loud at all frequencies" than white noise is.[2]

Pink noise is a random process with a power spectrum thatdecreases at a 10 dB/decade or 3 dB/octave rate with increasing frequency. Whenmeasured with a 1/3rd octave analyzer, or constant Q filter bank, it has a flatfrequency response. Since the critical bandwidth in hearing is approximately1/3rd octave wide, pink noise tends to give an equal representation of allfrequencies in the audio spectrum, from lows to highs. Thus it would seem to bea good auditory test signal, except that we do not have a referencefor what it should sound like in an absolute sense. This limits the usefulnessof pink noise to comparison tests of A versus B. Pink noise can reveal smallphysical differences between two sound sources, but it can be difficult to findthe cause for those differences or to predict their consequences. Pink noise candrive you nuts, so be careful. Still, pink noise will point to flaws and errorsin a sound system.

The tests use various 5 second combinations of L andR streams of uncorrelated pink noise. What I call Stereo here is actuallyfuzzy stereo and has no solid image, but is spatial like a cloud. In Monothe left and right tracks are identical. Left or Right means that there is soundonly in one or the other track.

The two loudspeakers are placed next to each other asclose as possible and in an open area of the room. Ideally they would soundidentical, though it is rare not to hear differences. There could be slightdifferences in the frequency response due to component variability or driverlevel adjustments. There could also be hearing differences between left andright ear that show up when listening from relatively close distance to the twoloudspeakers. Test your hearing response to pink noise with headphones. Swapleft and right headphones to hear if a particular timbre stays consistently withthe same ear. The test should reveal any driver polarity differences betweenleft and right loudspeakers due to wiring errors.