However, sirens were also used during wartime to alert soldiers and citizens alike of various scenarios from being alert, to danger or an all-clear signal.Ĭurrent-day sirens used by first responders have come a long way since the sirens of the old. It was in the 1970s that emergency vehicles employed the use of sirens, this included police sirens. To increase the volume of the sound generated by sirens, a horn was fitted to the device that turned the high pitch from the siren into a low-frequency loud noise that could be heard much further. Prior to the siren, emergency vehicles relied on bells to alert the public. It was this feature that inspired the name based on sirens from Greek mythology. In 1891 an improved siren was capable of producing loud noises even underwater. A far cry from the police sirens of today. Originally the siren was a musical instrument producing musical tones, especially in acoustical studies by the rapid interruption of a current of air, steam, or fluid by a perforated rotating disk. Free to download About the police siren □ Over 30 Police siren sound effects which include long, short, fast, and slow siren sound effects.
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