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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.
The Whelen siren's wail, yelp and phaser tones are a familiar sound in many cities. When an emergency vehicle is responding, it often uses audio warning devices in addition to the visual warnings provided by its warning lights. Audio warning devices are turned off once the vehicle is on-scene. Such devices include:
This Q2B or "Q-siren" is mounted on a Pierce Platform Aerial Fire Truck owned by the City of Bellingham, WA. The Q2B siren ("Q-siren") [1] is an electromechanical siren that is produced by the Federal Signal Corporation and is most recognizable for its sound, which is trademarked, and the look of the siren.
CBS News said in their caption that the sound was so accurate that some officers thought that their vehicles' sirens might have been faulty. Inspector Simon Hills described the mimicry as “so ...
Different siren noises may be used depending on traffic conditions and the context. For example, on a clear road, "wail" (a long up-and-down unbroken tone) is often used, whereas in heavy slow traffic or at intersections, "yelp" (essentially a sped-up wail) may be preferred.
The town’s protocol says the sirens and messaging will sound for 10 minutes, followed by intervals of five minutes of silence and five minutes of warnings “until the emergency has subsided.”
The use of flashing lights and sirens is colloquially known as blues and twos, which refers to the blue lights and the two-tone siren once commonplace (although most sirens now use a range of tones). In the UK, only blue lights are used to denote emergency vehicles (although other colours may be used as sidelights, stop indicators, etc.).
The Orange County Sheriff's Office said on social media that there was no active shooter at the park and that a fight broke out and a "popping" sound was heard that police believe was a balloon.