White, pink, brown...? In general, to what category does it subscribe the spectrum of city noises, like traffic noise, ambulance/police siren, alarms, etc, put together?

If the question is too broad, then, what is the color for particular noises, like traffic?

  • $\begingroup$ The noise "colors" really refer to signals without distinguishable acoustic features, and describe very continuous power spectral densities (PSDs) that are assumed to be stationary. Sirens, for example, don't fit those categories at all - they are modulated tones by definition, and as such have a very time-dependent PSD. So, you can't apply your color categories to the individual kind of noise sources, but only to their sum, when there's enough different sources that the result, by pure randomness, becomes time-invariant in PSD again. So, you're trying to apply inapplicable terms here :( $\endgroup$ Jul 13, 2018 at 23:49
  • $\begingroup$ Maybe your question can be salvaged - for what reason or purpose are you asking this? $\endgroup$ Jul 13, 2018 at 23:49
  • $\begingroup$ If there's more hills the motors generate more bass. You can get city noise samples from freesound and run freq graphs from arbitrary lengths. You wount find that with 1000ds of sound sources and recording locations' that its a simple sound system thst has a known type. More walls or skyscrapers mdke different filters. $\endgroup$ Jul 14, 2018 at 18:32

1 Answer 1


Noise color isn't a rigorous model for traffic noise



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