Types of Audio Subliminals

In this thread I hope to list various kinds of Audio Subliminals presently known to common public. I searched for something like this on the net, there were few places which listed them but I couldn’t find them on this forum.

  1. Back-masking
  2. Masking
  3. Silent Sound Spread Spectrum
  4. Binaural

More details and types will be added in the future.

More details and types will be added in the future.

Details are good, such as how to test the product to make sure your “manufacture” is correct and then how to decode or demodulate the product back into the sound you started with. Don’t leave out those last two plz.



I will try to add that information if I can find it. I don’t know much about Audacity to decode or demodulate them back to original form, in the other thread here about ultra sonic subliminals, I think a user posted a script to demodulate to the ultra sonic content close to the original.


This type of subliminal is audible but the sounds making up the words are in reverse order, it is similar to but not same as pronouncing the word “forward” as “drawrof”. Most smart phones have apps to achieve this effect, you can record yourself saying a word and play it backwards, this would be backmasking.

More information can be found on this link: https://en.wikipedia.org/wiki/Backmasking


This type of audio subliminal is meant to be inaudible, there are two sounds present, one foreground sound is the masking noise which is audible which is meant to obscure the audibility of some other noise, the background sound like a message. This is achieved by either raising the volume of the foreground sound which is meant to obscure or reducing the volume of the background sound, which is meant to be inaudible. This is made with the intention of delivering messages directly to the subconscious mind bypassing the conscious mind. For example, if you want your subconscious mind to believe every time it sees red color at traffic lights, it has to understand as go, you would record yourself saying something like “red is go”, then you would add another sound to mask the audibility of your utterance, like sounds of rain drops, etc.

So now you have two sounds:

  1. Your utterance(red is go, this is meant to be inaudible, so this would be background sound)
  2. Masking sounds(rain drops, etc, this is meant to be audible, so this would be the foreground sound)

If you find that even after adding this masking sound, you are still able to hear your utterance, you would either decrease the volume of your utterance or you would increase the volume of the masking sounds, until your utterance is barely audible. As your utterance would be at the threshold of audibility, your conscious mind will have difficult understanding it but your subconscious is believed to hear it and understand it.

More information can be found here: https://en.wikipedia.org/wiki/Auditory_masking

Silent Sound Spread Spectrum:

This is one of the most sophisticated subliminals listed here. This type of subliminal has been first described in a patent by Oliver M. Lowery, link: US5159703A - Silent subliminal presentation system - Google Patents

In brief, it is described on the patent page as such:

A silent communications system in which nonaural carriers, in the very low or very high audio frequency range or in the adjacent ultrasonic frequency spectrum, are amplitude or frequency modulated with the desired intelligence and propagated acoustically or vibrationally, for inducement into the brain, typically through the use of loudspeakers, earphones or piezoelectric transducers.

Human beings can only hear sounds in the range of 20Hz to 20,000Hz(also known as 20KHz). In this frequency range, frequencies closer 20Hz are called low frequencies and frequencies closer to 20KHz are called high frequencies. Anything above 20KHz is called ultrasonic.

As humans grow, because of noise pollution or age, their ability to hear sounds at the high frequency decreases, only children have the ability to hear up to 20KHz, most adults can only hear up to 16KHz. So from this, anything above 16KHz can be considered inaudible for an adult.

This Silent Sound Spread Spectrum patent claims that an audio message can be either frequency modulated or amplitude modulated into an inaudible high frequency. This form of subliminal doesn’t work with MP3 and other similar encoding techniques.

A plug-in for this is available for Audacity, it is mentioned in this link: Silent Subliminals [solved?]