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2. Wikipedia:Free sound resources - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Free_sound_resources

   Independent, unique sound library with royalty free & free sound effects - for video, sound design, music productions and more. CC0, CC BY Gfx Sounds: Yes Yes Sound library for professional and free sound effects downloads. CC0, CC BY Free To Use Sounds: Yes Yes Sound effects library with hiqh quality field recordings from all around the world.

3. Freesound - Wikipedia

   en.wikipedia.org/wiki/Freesound

   The Freesound platform is based on technology developed by the Music Technology Group of the Pompeu Fabra University, Barcelona. Similarity searches based on automatically extracted audio features using Essentia [5] audio analysis tool. Spectral centroid waveform display [6] The following web technologies are also used: Python scripting ...

4. Civil defense siren - Wikipedia

   en.wikipedia.org/wiki/Civil_defense_siren

   Sound sample ⓘ A civil defense siren is a siren used to provide an emergency population warning to the general population of approaching danger. Initially designed to warn city dwellers of air raids (air-raid sirens) during World War II, they were later used to warn of nuclear attack and natural disasters, such as tornadoes (tornado sirens).

5. Siren (alarm) - Wikipedia

   en.wikipedia.org/wiki/Siren_(alarm)

   In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.

6. Tennessee tornado sirens failed to sound in storm that ... - AOL

   www.aol.com/tennessee-tornado-sirens-failed...

   Since 2003, such sirens have been used in the state to alert residents to imminent danger from tornadoes.. In 2013, a $2m grant was provided to the Nashville county to upgrade the system with new ...

7. Wikipedia:List of sound files - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:List_of_sound_files

   If you have trouble playing ogg files, see Wikipedia:Media help (Ogg). If you would like to help expand and improve this list, and integrate it with other Wikipedia articles, please visit the free music taskforce. Smartphones like the iPhone can store and play music listed here, using various free apps such as Capriccio.