Noise of the Parisian ring road when the traffic is dense and difficult. Sound from the window of my car, rolling. UCS Category: AMBUrbn. Duration: 03:54.
Distress signal "SOS" in international Morse (sound) alphabet. the Morse is formed of "dit" and "dah" (of points and features). 1 "dah" equals 3 "dit". The spaces between the letters are equivalent to 1 "dah", except for the SOS, which must be sent as if it were a single letter, that is to say not using an inter-letter interval. Ends with a space between the words equivalent to 7 "dit". Realized on a computer with a sine wave of 800 Hz. For more information on Morse: en.wikipedia.org/wiki/Morse_code. UCS Category: COMTelm. Duration: 00:03.
Telephone tone when searching a correspondent. This is a sound wave frequency of 440 Hz sinusoidal, slightly clipped. This sound is easy to loop. UCS Category: COMTelph. Duration: 00:01.