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A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...
Ululation (/ ˌ j uː lj ʊ ˈ l eɪ ʃ ən, ˌ ʌ l-/ ⓘ, [1] [2] from Latin ululo), trilling or lele, is a long, wavering, high-pitched vocal sound resembling a howl with a trilling quality. It is produced by emitting a high pitched loud voice accompanied with a rapid back and forth movement of the tongue and the uvula. [3]
The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...
Extended episodes of TV shows. Adaptations of operas, Broadway plays, and other musicals; Celebrity profiles, interviews, or tribute specials; Seasonal programs or parades: Christmas television specials, Macy's Thanksgiving Day Parade, New Year's Eve; Theatrical films and "made-for-TV" movies; Animated cartoons (shorts, more than two-part episodes)
The device works by emitting an ultra-high frequency blast (around 19–20 kHz) that teenagers or people under approximately 20 are susceptible to and find uncomfortable. Age-related hearing loss apparently prevents the ultra-high pitch sound from causing a nuisance to those in their late twenties and above, though this is wholly dependent on a ...
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A siren is a loud noise-making device. There are two general types: mechanical and electronic. There are two general types: mechanical and electronic. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks.
Artificial crowd noise is pre-recorded audio that simulates the live sounds of spectators, particularly during sporting events.. Sports teams have used artificial crowd noise to simulate stadium sounds during practices to acclimate themselves to conditions they would face in actual games, and some have accused teams of using artificial crowd noise on top of in-person crowds to distract ...