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A video tape recorder (VTR) is a tape recorder designed to record and playback video and audio material from magnetic tape. The early VTRs were open-reel devices that record on individual reels of 2-inch-wide (5.08 cm) tape.
By the 1990s Ampex focused more on video recorders, instrumentation recorders, and data recorders. In 1991, Ampex sold their professional audio recorder line to Sprague Magnetics. [18] The Ampex Recording Media Corporation spun off in 1995 as Quantegy Inc.; that company has ceased producing recording tape. Consumer models
In order to record high frequencies, a tape must move rapidly with respect to the recording or playback head. The frequencies used by video signals are so high that the tape/head speed is on the order of several meters per second (tens of feet per second), an order of magnitude faster than professional analog audio tape recording.
Doorbell at the entrance of Chetham's Library, Manchester, England Sound of a two-tone mechanical doorbell A doorbell is a signaling device typically placed near a door to a building's entrance. When a visitor presses a button , the bell rings inside the building, alerting the occupant to the presence of the visitor.
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One of the earliest smart doorbells that entered to the market is the Ring Video Doorbell which was created by entrepreneur Jamie Siminoff in 2013. Since then, several more smart doorbells have been introduced to the market, some of them with additional, unique features. Another major one is Nest Hello. [3] [4] [5] [6]
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