<Li> Vocal spectrum noise used for testing audio circuits </Li> <Li> Joseph S. Wisniewski wrote that "green noise", as marketed by producers of ambient sound effects recordings, is "supposedly the background noise of the world ." It is noise that simulates the spectra of natural settings, without man - made noises . It is similar to pink noise but it has more energy in the area of 500 Hz . </Li> <Ul> <Li> Silence </Li> <Li> Noise with a 1 / f spectrum, where β> 2 . This formula is used to model the frequency of natural disasters . </Li> <Li> Noise that has a frequency spectrum of predominantly zero power level over all frequencies except for a few narrow bands or spikes . Note: An example of black noise in a facsimile transmission system is the spectrum that might be obtained when scanning a black area in which there are a few random white spots . Thus, in the time domain, a few random pulses occur while scanning . </Li> <Li> Noise with a spectrum corresponding to the blackbody radiation (thermal noise). For temperatures higher than about 6993300000000000000 ♠ 3 × 10 K the peak of the blackbody spectrum is above the upper limit to human Hearing range . In those situations, for the purposes of what is heard, black noise is well approximated as violet noise . At the same time, Hawking radiation of black holes may have a peak in hearing range, so the radiation of a typical stellar black hole with a mass equal to 6 solar masses will have a maximum at a frequency of 604.5 Hz, this noise is similar to green one . A formula is: f max ≈ 3627 × M ⊙ M (\ displaystyle f_ (\ text (max)) \ approx 3627 \ times ((\ text (M)) _ (\ odot) \ over (\ text (M)))) Hz . Several examples of audio files with this spectrum can be found here . </Li> </Ul> <Li> Noise with a 1 / f spectrum, where β> 2 . This formula is used to model the frequency of natural disasters . </Li>

Is there such a thing as black noise