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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.
Freesound is a collaborative repository of Creative Commons licensed audio samples, and non-profit organisation, with more than 500,000 sounds and effects (as of May 2021), [1] and 8 million registered users (as of March 2019). Sounds are uploaded to the website by its users, and cover a wide range of subjects, from field recordings to ...
The Standard Emergency Warning Signal (SEWS) is a warning siren used in Australia to alert the public of danger. The siren is played over radio, television or public address systems in public places to warn of bushfire, flood, cyclone, tsunami, earthquake or terrorist attack.
Sounds to Sample is a UK-based website that sells copyright free audio samples and loops for use in music production. It was launched in 2007 (17 years ago) ( 2007 ) by Sharooz Raoofi and David Felton, initially as a digital download portal for the Sample Magic libraries, and expanded to include developers such as Sony , Zero G and Best Service ...
A siren disk is used in pneumatic sirens and has holes which are variously spaced apart. When the disk is spun in front of a jet of air, the holes modulate the air-jet which produces a sound. The pitch of a siren is produced by "the frequency of the impulses of compressed air passing through the openings in a rotating disk."
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FMOD Studio low-level API - A programmer API that stands alone, with a simple interface for playing sound files, adding special effects and performing 3D sound. Legacy products include: FMOD Ex - The sound playback and mixing engine. FMOD Designer 2010 - An audio designer tool used for authoring complex sound events and music for playback.
And there are sirens of other sorts used musically, for example the two electric sirens used by Edgard Varèse in Ionisation (1929–1931) and the factory siren used by Dmitri Shostakovich in Symphony No. 2 (1927) (but Shostakovich's siren part is nowadays often played by the brass section using their standard instruments).