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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. Although the first ...
When an electric current is applied, it produces a repetitive buzzing, clanging or ringing sound. Electromechanical bells have been widely used at railroad crossings , in telephones , fire and burglar alarms , as school bells , doorbells , and alarms in industrial areas, since the late 1800s, but they are now being widely replaced with ...
Video door phone indoor terminal.. Going a little further in time, we find video door phones featuring a video installation apart from the classical audio. In these cases, the intercom plate has the same structure as the previous version but features a video monitor connected to a surveillance camera that allows inspecting the person who pressed the button and part of the surrounding area.
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There is a "doorbell" sound when anyone on one side of a door on the series attempts to get the attention of the person on the other side. It's 3 mid-pitch tones followed by a high-pitched tone. This sound seem very familiar to me from somewhere else, possibly a video game.
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What differentiated the NBC chimes from these earlier identifying sounds, at least in the beginning, is their use for network communications and coordination. Later they would also become a signature sound representing the network, but their primary initial purpose was to help ensure smooth network operations.
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