The LRAD is the round black device on top of the New York City police Hummer. The long range acoustic device (LRAD) is a crowd-control and hailing device developed by American Technology Corporation. Image File history File links Download high resolution version (600x627, 52 KB) Summary LRAD device mounted on NYPD vehicle, Republican National Convention, New York City, 2004 Photographer: http://www. ...
Image File history File links Download high resolution version (600x627, 52 KB) Summary LRAD device mounted on NYPD vehicle, Republican National Convention, New York City, 2004 Photographer: http://www. ...
New York, New York and NYC redirect here. ...
American Technology Corporation is a USA firm which is developing sound and ultrasound technology. ...
The equipment weighs 45 pounds (20 kg) and can emit sound in a 15 to 30° beam (only at high frequency) from a device 33 inches (83 cm) in diameter. At maximum volume, it can emit a warning tone that is 150 dBSPL (1000 W/m²) at 1 metre, a level that is capable of permanently damaging hearing, and 50 times the normal human threshold of pain (120 – 140 dB). The design range extends 300 to 500 metres. At 300 metres, the warning tone is 105 dB. The warning tone is a high-pitched shrill tone similar to that of a smoke detector, only somewhat louder. db(spl) = decibel sound PRESSURE level. ...
Hearing is one of the traditional five senses, and refers to the ability to detect sound. ...
The absolute threshold of hearing (ATH) is the minimum sound level of a pure tone that an average ear with normal hearing can hear in a noiseless environment. ...
It's instructive to note that any loudspeaker of equal size will generate a beam of the same directivity as LRAD. The parameter "ka", which is the wave number multiplied by the speaker radius, is often used to characterize sound source directivity. For this source, ka=19 at 2.5kHz, and according to the LRAD data sheet, the beam angle of about 30 degrees total - precisely what is predicted for a regular loudspeaker [1]. Contrary to some beliefs, the device does not use ultrasound. Wavenumber in most physical sciences is a wave property inversely related to wavelength, having units of inverse length. ...
Carl Gruenler, (former) vice president of military and government operations for American Technology Corp. (and who now runs a company making a competing device), says that being within 100 yards (90 m) of the device is extremely painful, but its use should be limited to 300 yards (270 m) to be effectively used. He concedes that the device is powerful enough to cause permanent auditory damage, but that it is only meant to be used for a few seconds at a time.
Countermeasures may include the use of passive hearing protection (earplugs, headsets), which may bring the sound down to ineffective levels. In addition, sound could be reflected from a solid surface, and redirected back to the originator.
Usage
The device was originally intended to be used by American warships to warn incoming vessels approaching without permission, but has now diversified as a more general-use weapon in America's non-lethal force arsenal. Other devices are being developed by the military as non-lethal weapons, such as the Active Denial System, which uses a painful energy beam to discourage would-be attackers or simply any individual the possessor of the weapon might wish to control. Image File history File links LRAD-US-Navy. ...
Image File history File links LRAD-US-Navy. ...
{{ USN redirects here. ...
The examples and perspective in this article or section may not represent a worldwide view. ...
// Humvee with ADS mounted. ...
The device is currently used extensively at Camp Bucca Iraq and is being tested in regions of Baghdad, Fallujah, along with other regions of Iraq. The device was also used by police in New York City during protests of the 2004 Republican National Convention. Baghdad (Arabic: ) is the capital of Iraq and of Baghdad Governorate. ...
This article is about the city of Fallujah in Iraq. ...
New York, New York and NYC redirect here. ...
As President Bush accepted his nomination, thousands gathered in Union Park for a vigil dedicated to, according to United for Peace and Justice, Those who have died or will die as a result of the Bush administration. ...
2004 Republican National Convention Logo President George W. Bush and Vice President Dick Cheney accepted their partys nomination to run for second terms. ...
The luxury cruise ship "Seabourn Spirit" employed an LRAD while repelling pirates who attacked the vessel with RPGs about 160 km off the coast of Somalia in early November 2005.[1][2] The effectiveness of this device during the attack is not completely clear, however the pirates did not succeed in boarding the vessel and eventually fled. Tonnage: 10,000 Length: 440 feet Width: 63 feet Draft: 16. ...
Look up pirate and piracy in Wiktionary, the free dictionary. ...
An RPG-7 captured by the US Army RPG, or Rocket propelled grenade is a loose term describing hand-held, shoulder-launched anti-tank weapons capable of firing an unguided rocket equipped with an explosive warhead. ...
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Non-weapon uses There is a small German company providing systems with similar projection characteristics for large-audience jazz and classical music concerts, sports stadium audio, and so on. Holosonic Research Labs, founded by FJ Pompei, sells the Audio Spotlight a commercial version currently installed in museums such as the Tate Modern and in digital signage by companies such as Cisco. This article needs additional references or sources for verification. ...
Classical music is a broad, somewhat imprecise term, referring to music produced in, or rooted in the traditions of, European art, ecclesiastical and concert music, encompassing a broad period from roughly 1000 to the present day. ...
Note - ^ Beranek, Leo L. 1986. Acoustics, p.132 , American Institute of Physics.
The American Institute of Physics (AIP) is a professional body representing American physicists and publishing physics related journals. ...
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