This noise is created by repetitions of patterns, these are used primarily to not scare the listener (whom has usually ingested some sort of contra-ban)
Mindless computer generated noise listened to by drugged up, hoodie wearing thieving idiots. No being that likes this sort of noise ever purchases a CD, instead they steal it from the local supermarket along with razors, alcohol and anything they can sell down the local public house to buy money for drugs.