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It is also desirable that the doorbell camera 106 can provide dynamic audio
feedback to a user via the microphone 1104 and the speaker 1106. The feedback may concern an operational status of the doorbell camera 106 itself, a status of the outdoor environment surrounding the doorbell camera 106, the operational status of another electronic device associated with the doorbell camera 106, and/or the operational status of a set of electronic devices 106 associated with the doorbell camera. For ease of references, the speaker 1106 and the speaker box 1136 are collectively called the speaker 1106 in this application. In some implementations, the lens assembly 704 includes a cover glass 705, a camera lens structure 1132 and an infrared filter 1134. The IR filter 1134 is activated in the daytime mode for precise color reproduction, and disabled in the night mode for greater light sensitivity when the field of view of the doorbell camera 106 is illuminated by the IR illuminators 1105. Optionally, the ALS assembly 714 is also used to cause switching between the daytime and night modes, and enable/disable the IR illuminators 1105 and the infrared filter 1134. In some implementations, the lens holder 1120 is supported by the infrared filter 1134 to protect lenses in the lens assembly 704 from being pushed when a user touches or presses the front cover plate 708. The doorbell camera 106 may include at least a sensor board 1108, a main board 1110 and a secondary board 1112 that are stacked within the device housing 702. In some implementations, the sensor board 1108 includes a connector 1108A that is coupled to another connector of the main board 1110 directly. Alternatively, a
flexible cable is optionally connected to the connector 1108A for electrically coupling the main board 1110 to the sensor board 1108. In some implementations, two ends of a flexible printed circuit FPC 1126 are electrically coupled to a respective connector at the main board 1110 and the secondary board to couple them to each other.
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Cameras are generally acceptable in hallways, parking lots, front offices where students, employees, and parents come and go, gymnasiums, cafeterias, supply rooms and classrooms. The installation of cameras in classrooms may be objected to by some teachers. There were an estimated 30 million surveillance cameras in the United States in 2011. Video surveillance has been common in the United States since the 1990s; for example, one manufacturer reported net earnings of $120 million in 1995. With lower cost and easier installation, sales of home security cameras increased in the early 21st century. Following the September 11 attacks, the use of video surveillance in public places became more common to deter future terrorist attacks. Under the Homeland
Security Grant Program, government grants are available for cities to install surveillance camera networks. In 2009, there were an estimated 15,000 CCTV systems in Chicago, many linked to an integrated camera network. New
York City's Domain Awareness System has 6,000 video surveillance cameras linked together, there are over 4,000 cameras on the subway system although nearly half of them do not work, and two thirds of large apartment and commercial buildings use video surveillance cameras. In the Washington D. C.
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