Pink noise or 1/ƒ noise (sometimes also called flicker noise) is a signal or process with a frequency spectrum such that the power spectral density (energy or power per Hz) is inversely proportional to the frequency: en.wikipedia.org/wiki/Pink_noise. UCS Category: TEST. Duration: 00:19.
An old metro from Paris arrives, stops, I get in, then leaves. Check-in from the platform, then from inside a train car. UCS Category: TRNInt, TRNSbwy. Duration: 01:50.
Paris apartment. First floor. Closed window (some glass vibrations at low frequencies), before crossing a boulevard (acceleration and braking of vehicles). UCS Category: AMBRoom. Duration: 04:02.
Singing a field cricket. Present in France, the field cricket digs a hole in the sunny plains and sings to seduce the female. UCS Category: ANMLInsc. Duration: 00:36.
Noise of a helicopter. Recording from inside. Wind noise in the paddles. Low and muffled. Sound is difficult loopable. UCS Category: AEROHeli. Duration: 00:08.