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  2. Intercom - Wikipedia

    en.wikipedia.org/wiki/Intercom

    Many schools and office buildings now use audio / video systems to identify visitors trying to gain access to a locked building and can be interfaced with the building's access control system. Besides fixed locations, intercom systems are used on many types of vehicles including trains, watercraft, aircraft and armoured fighting vehicles.

  3. Clear-Com - Wikipedia

    en.wikipedia.org/wiki/Clear-Com

    The product line of Clear-Com has expanded beyond party-line wired units to include multi-channel intercoms and wireless technology. Clear-Com patented a multi-channel wired digital intercom system in 2009, used in the HelixNet product line. The company's FreeSpeak wireless intercom was nominated in 2020 for a TEC Award. [7]

  4. Sound-powered telephone - Wikipedia

    en.wikipedia.org/wiki/Sound-powered_telephone

    A dial telephone system with a battery backup will not meet the USCG Regulations as they currently exist. Other uses for sound-powered telephone technology today include emergency communications systems for high-rise buildings, draw bridges, ski lifts, and temporary locations where reliable communication is necessary.

  5. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    PA and Intercom systems are commonly used as part of an emergency communication system. The term sound reinforcement system generally means a PA system used specifically for live music or other performances. [1] In Britain, PA systems are often known as tannoys after a company of that name that supplied many of the systems used there. [2]

  6. Intercom telephone - Wikipedia

    en.wikipedia.org/wiki/Intercom_telephone

    An intercom telephone is a special kind of telephone that controls an intercom system. Intercom telephones can be found in residential, commercial, and educational settings. [1] For an example, a school is an environment that displays all the capabilities of an intercom

  7. Interruptible foldback - Wikipedia

    en.wikipedia.org/wiki/Interruptible_foldback

    The IFB is a special intercom circuit that consists of a mix-minus program feed sent to an earpiece worn by talent via a wire, telephone, or radio receiver (audio that is being "fed back" to talent) that can be interrupted and replaced by a television producer's or director's intercom microphone. [14]

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