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  2. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.

  3. Sound reinforcement system - Wikipedia

    en.wikipedia.org/wiki/Sound_reinforcement_system

    A sound reinforcement system is the combination of microphones, signal processors, amplifiers, and loudspeakers in enclosures all controlled by a mixing console that makes live or pre-recorded sounds louder and may also distribute those sounds to a larger or more distant audience. [1] [2] In many situations, a sound reinforcement system is also ...

  4. Tannoy - Wikipedia

    en.wikipedia.org/wiki/Tannoy

    Actor Cyril Ritchard and three young women listen to the Tannoy public address system in 1948. Professional studio monitor Little Gold Monitor (c. 1990) with two-way-coaxial construction, meaning the tweeter for frequencies from 1.400 Hz and above is located independently in the center of the 30 cm bass driver.

  5. Emergency communication system - Wikipedia

    en.wikipedia.org/wiki/Emergency_Communication_System

    WMT Public Address Systems; Wireless Mobile Telephony (WMT) PA Systems refers to PA paging and [intercom] systems that use any form of Wireless Mobile Telephony System such as GSM networks instead of a centralized amplifier to distribute the audio signal to paging locations across a building or campus, or other location. The GSM mobile Networks ...

  6. Speech transmission index - Wikipedia

    en.wikipedia.org/wiki/Speech_transmission_index

    Speech Transmission Index (STI) is a measure of speech transmission quality. The absolute measurement of speech intelligibility is a complex science. The STI measures some physical characteristics of a transmission channel (a room, electro-acoustic equipment, telephone line, etc.), and expresses the ability of the channel to carry across the characteristics of a speech signal.

  7. General emergency signal - Wikipedia

    en.wikipedia.org/wiki/General_Emergency_Signal

    The signal is composed of seven or more short blasts followed by one long blast on the ship's whistle and internal alarm system. [1] Within 24 hours of embarkation of all passengers, the crew will conduct a mandatory muster drill in which the General Emergency Signal is sounded. The purpose of the drill is to educate passengers of emergency ...

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