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Clear-Com is a manufacturer of electronic intercom products, widely used to enable stage management and crew communications in theatre, filmmaking, video and television production, concerts, professional sports competitions, special events and audiovisual presentations.
DMS-100 (large local digital Class 5) (also known as an SL-100 when used as CPE (Customer Provided Equipment or PBX service)also known as Centrex. A Nortel DMS-100e used by an operator to offer local and long-distance services in France; DMS-100/200 (local/toll digital more than 135,000 lines) DMS-200 (toll digital)
The United States and Canada have several frequency ranges for wireless intercom systems and other wireless products. They are 49 MHz , FM band (160–270 kHz), 900 MHz, 2.4 GHz, 5.8 GHz, and MURS (150 MHz).
NuTone is an American company that manufactures products mainly for residential use, including doorbells, intercom systems, indoor air quality products, ventilation systems, range hoods, ceiling fans, built-in electric heaters, ironing equipment, and home theater systems. The company was founded in 1936 by J. Ralph Corbett in Cincinnati, Ohio. [1]
A butler uses an intercom on behalf of a lady. An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [1]
Intercom systems that use a speaker in a room as both a speaker and a microphone will often use VOX on the main console to switch the audio direction during a conversation. The circuit usually includes a delay between the sound stopping and switching direction, to avoid the circuit turning off during short pauses in speech.
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