Ringtone Air Horn [WITH FREE DOWNLOAD LINK IN DESCRIPTION]
Channel: Minim Ringtones
Date: 12/07/2023

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An air horn is a pneumatic device designed to create an extremely loud noise for signaling purposes. It usually consists of a source which produces compressed air, which passes into a horn through a reed or diaphragm. The stream of air causes the reed or diaphragm to vibrate, creating sound waves, then the horn amplifies the sound making it louder. Air horns are widely employed as vehicle horns, installed on large buses, semi-trailer trucks, fire trucks, trains, and some ambulances as a warning device, and on ships as a signaling device. An air horn consists of a flaring metal or plastic horn or trumpet (called the "bell") attached to a small air chamber containing a metal reed or diaphragm in the throat of the horn. Compressed air flows from an inlet line through a narrow opening past the reed or diaphragm, causing it to vibrate, which creates sound waves. The flaring horn serves as an acoustic impedance transformer to improve the transfer of sound energy from the diaphragm to the open air, making the sound louder. In most horns it also determines the pitch of the sound. When vibrated by the diaphragm, the column of air in the horn vibrates in standing waves. The length of the horn determines the wavelength of the sound waves generated, and thus the fundamental frequency (pitch) of the note produced by the horn. The longer the horn, the lower the pitch.

Larger air horns used on ships and foghorns function similarly to a whistle; instead of a diaphragm the air escapes from a closed cylindrical resonator chamber through a precisely shaped slit directed against a knife edge (fipple). The air blowing past the knife edge oscillates, creating sound waves. The oscillations excite standing waves in the resonator chamber, so the length of the chamber determines the pitch of the note produced.

Trucks and buses
In trucks and buses, the air horn is powered with compressed air from the vehicle's air brake system. In trucks, a cord mounted on the ceiling of the operator's cab is pulled or in buses, a valve lever on the side of the dashboard is pushed down or pulled up to open the valve, supplying varying amounts of air to the horn. Thus, an outstretched hand reaching upward and pumping is a signal to the driver of an air horn equipped vehicle, requesting a toot. In modern trucks and buses, the horn is actuated by a button on the steering wheel (just like a normal car horn). Some trucks and buses have both electric and air horn, selectable by a switch on the dashboard. This is to prevent the use of the powerful air horn in populated areas.

Emergency vehicles
File:Toronto Fire uses air horn while responding.webm
Toronto Fire uses air horn while responding
Many fire trucks, ambulances, and other large emergency vehicles operate air horns as a means of warning vehicles to clear the right-of-way.

There are also electronic horns for emergency vehicles, which produce a similar easily recognizable sound. These are typically integrated into the same system as the vehicle's electronic siren, and sound through the same speakers. In the last several decades, electronic sound systems with more widely varying frequencies have been chosen as common supplemental warning systems. The air horn is used for signalling in various sports:

ice hockey (especially in the NHL)
the National Lacrosse League
Major League Baseball (MLB)
indoor soccer
the National Football League (NFL)
NHL arenas normally employ two horns—a high-pitched horn (or a siren, as in the home arenas of the Boston Bruins and Montreal Canadiens) that announces the end of the period (or the start of instant replay reviews), and a much louder, lower-pitched horn sounded when the home team scores and/or wins a game. Some MLB stadiums use horns for similar purposes, such as when a member of the home team hits a home run. In many places, air horns are used for signaling the end of the period or quarter on scoreboard systems.

The idea of a goal horn in NHL ice hockey is said to have begun in 1974, when Bill Wirtz, then-owner of the Chicago Blackhawks, liked the sound of the horn on his yacht so much that he had another example of it mounted inside of the team's home arena, Chicago Stadium, to be sounded whenever the Blackhawks scored a goal.[6]

In mixed martial arts, an air horn is commonly used to signal the end of a round as opposed to the bell used in boxing and professional wrestling. However, CZW, GCW, and other independent wrestling companies allow air horns, while major companies such as WWE and IMPACT Wrestling have banned them.

Use in music
Samples of various air horns have been used by NHL teams when the home team scores a goal, often accompanied by music.

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