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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 ...
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 ...
The David S. Pumpkins Halloween Special; The Day After Tomorrow (TV special) Deck the Halls with Wacky Walls; Dennis the Menace in Mayday for Mother; Dick Clark's New Year's Rockin' Eve; Dr. Seuss' The Grinch Musical Live! A Doonesbury Special; Doug Henning's World of Magic
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)
Programme Making and Special Events (PMSE) is a term used, typically in Europe, to denote equipment that is used to support broadcasting, news gathering, theatrical productions and special events, such as culture events, concerts, sport events, conferences and trade fairs.
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 ...
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The devices have also been employed to keep marine mammals away from fishing nets. [2] The devices are known as acoustic harassment devices (AHDs) and acoustic deterrent devices, which are smaller AHDs [3] or intended as an awareness tool to warn species to the presence of danger rather than as a tool of harassment at a much louder level. [4]