By awixas January 16, 2020
In this article, I will explain the differences in noise generation colours that are used in masking subliminal messages. A popular technique in subliminal embeds is to 'hide' subliminal affirmations in what we call the floor noise. Floor noise refers to all the unwanted sounds picked up by a mic in audio production and it usually sounds a lot like static. It is common to add some generated background 'static' to hide all these unwanted sounds when doing audio production. Generated noise is a wonderful opporutnity to embed some hidden subliminal messages because these messages will be drowned out by the noise. For advanced subliminizers, it is important to understand the differences and frequencies of generated noise so that you could use the appropriate added noise track for the purpose of your subliminal mix.
Fun Fact: did you know that the static you hear on a tv or radio when it is not tuned to an video/audio input channel is actually cause (in part) by Cosmic microwave background? This cosmic noise originates from the origins of our universe and is actually the early electro-magnetic waves caused by 'echos' of the big bang! More about Cosmic Background Noise
In audio production (and in electronics), noise refers to unwanted disturbances in an electrical signal. You can think of noise as the sum of all unwanted background energy picked up by an electronic device such as a microphone or radio antenna. Although we usually think of noise as undesirable, there are times when we want to include noise in an audio track because it could serve some useful purposes, such as drowning out other sounds or creating a baseline sound for a listener to rest their mind on. Certain types of noise can be also used to help people sleep or relax because it has the effect of drowning out distracting sounds. This is not unlike listening to a gentle rain audio track for meditation.
When we hear any sound, that sound wave arrives at the ear as a physical sound wave traveling through a medium such as the air around us. But within the ear the sounds are transformed into neural action potentials. The neural interpretation of sound we experience is the result of our biological needs. Our evolution has given our minds a sort of audio filter that favours some sounds over others. Psychoacoustics tells us that humans don't percieve loudness across the frequency specturm uniformly. We hear some frequencies louder than others, and of course some frequencies we can not hear consciously at all. Different noises will have various emotional effects on us as they will remind our subconsious mind of natural occuring phenomenon such as rain, thunder, waterfalls, hissing snakes, ghostly sounds, blowing wind and more. Most background noise will have a neutral or calming effect on us, whereas some types of noise could be jarring or stir anxiety.
The different colours of generated noise are simply random noise limited or equalized to different sets of frequences. The most common noise is White noise, Brown Noise and Pink Noise. For the purpose of creating subliminal audios, it is important for a producer to understand the differences between these noise colours.
White noise is similar to white light in that it is a signal equally generated across all frequencies. White noise has a spectral frequency of 1, meaning that equal proportions of all frequencies are present. Because the human ear is more susceptible to high frequencies, white noise sounds very hissy. White noise is generated by random values for each sample across the band spectrum. White noise is a good default option for hiding subliminal messages because this noise will cover every frequency of an audio sample. When you use white noise to cover sounds, you don't need to think about the band range of the sound (subliminal) you are masking because the white noise will drown out all frequencies.
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Brown noise, also known as brownian noise, red noise or random walk noise is noise generated with stronger levels at longer wavelengths and weaker at shorter wavelengths. This gives the noise a softer earthy sound with lower tones being favoured. This is the sound of a low roar that could resemble the sound of a waterfall, heavy rain or thunder. Brown noise is produced by the mathematics of brownian motion, or the random movement of particles in liquid. Brown noise has a spectral frequency of 1/f2, which means, in layman’s terms, that the noise has much more low-frequency content. Brown noise is so called because, when viewed, the wave follows a Brownian motion curve. When graphed, this waveform looks like a mountain range.
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Pink noise is one of the most common signals found in natural occuring biological systems. Pink noise has an equal amount of power at every octive. This is different from white noise because in physics, high frequency bands require more energy to produce the same amplitude. This is because higher frequencies need to oscillate at a faster rate, which consumes more energy. Pink noise has a spectral frequency of 1/f and is found mostly in nature. It is the most natural sounding of the noises. By equalizing the sounds, you can generate rainfall, waterfalls, wind, rushing river, and other natural sounds. Pink noise is exactly between brown and white noise (hence, some people used to call it tan noise). It is neither random nor predictable; it is fractal-like when viewed. When zoomed in, the pattern looks identical to when zoomed out, except at a lower amplitude.
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Blue Noise, which is sometimes considered high-frequency white noise, is a noise color with a spectral density (power per hertz) that is proportional to its frequency. This means that the power and energy of the signal increases as frequency increases. In audio production blue noise is often used for dithering, or the process of smoothening out distortions.
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Violet noise has high power in high frequencies making it sound like an extreme version of blue noise. Used mostly in audio production as a filter to reduce distortions in high frequencies.
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Our minds can only interperate sounds within a given range of frequencies and we actually hear some frequencies as louder than others. Grey noise is like white noise but uses psychoacoustics to equalize the frequencies so that our ears and brains interperate each frequency as being equally loud.
Black noise is the complete lack of audio frequencies otherwise known as silence. Technically speaking, Black Noise has a frequency spectrum of predominantly zero power level over all frequencies except for a few narrow bands or spikes.
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