Wireless security cameras are closed-circuit television cameras (CCTVs) that transmit video and audio signals to a wireless receiver via a radio band. Many wireless security cameras require at least one cable or cable for power; "wireless" refers to the video/audio transmission. However, some wireless security cameras use batteries, making cameras completely wireless from top to bottom.
Wireless cameras are proving very popular among modern security consumers due to low installation costs (no need to run expensive video extension cables) and flexible installation options; wireless cameras can be installed/installed in locations that were not previously available for standard cable cameras. In addition to ease of use and convenience of access, wireless security cameras allow users to take advantage of broadband wireless internet to provide unlimited streaming video over the internet.
Video Wireless security camera
Type
Wireless analog
Wireless analog is the transmission of audio and video signals using radio frequency. Typically, analog wireless has a transmission range of about 300 feet (91 meters) in open space; walls, doors, and furniture will reduce this range.
The analog wireless is found in three frequencies: 900 MHz, 2.4 GHz, and 5.8 GHz. Currently, most wireless security cameras operate at a frequency of 2.4 GHz. Most home routers, cordless phones, video game controllers, and microwaves operate at a frequency of 2.4 GHz and can cause interference to your wireless security camera. 900 MHz is known as Wi-Fi Friendly because it will not interfere with Internet signals from your wireless network.
Benefits include:
- Cost savings: the cost of each camera is low.
- Multiple receivers per camera: signals from one camera can be picked up by any recipient; You can have multiple recipients in multiple locations to create your wireless surveillance network
Deficiency:
- Disruptive interference from other home appliances, such as microwaves, cordless phones, video game controllers and routers.
- No signal strength indicator: no visual marks (like bars on cell phones) indicate the strength of your signal.
- Vulnerable to interception: since wireless analogs use consistent frequencies, it is possible for signals to be picked up by other receivers.
- One-way communication only: the recipient can not send a signal back to the camera.
Digital wireless camera
Digital wireless is the transmission of analog audio and video signals encoded as digital packets through high frequency radio frequencies.
Benefits include:
- Broad transmission range - usually almost 450 feet (open space, clear viewing distance between camera and receiver)
- High-quality video and audio
- Two-way communication between camera and receiver
- Digital signals mean you can send commands and functions, such as turning on and off the lights
- You can connect multiple receivers to a single recording device, such as a security DVR
Maps Wireless security camera
Usage and app
Home security system
Wireless security cameras are becoming increasingly popular in the consumer market, being a cost-effective way to have a comprehensive home or business-installed monitoring system at a price that is often cheaper. Wireless cameras are also ideal for people who rent a house or apartment. Since no need to run a video extension cable through a wall or ceiling (from camera to receiver or recording device), one does not need owner approval to install wireless security camera system. In addition, the lack of cable allows less "clutter", avoiding damage to the look of the building.
Wireless security cameras are also a great choice for seasonal monitoring and monitoring. For example, one can observe a pond or terrace.
Camera Barn
Wireless cameras are also very useful for monitoring other buildings because wireless signals can be sent from one building to another where it is impossible to run cables due to roads or other obstructions. One common use of this is to observe the animals in the warehouse of a house located on the same property. One example like this can be seen in the story of one of the first BarnCam in the New York Times.
Law enforcement
Wireless security cameras are also used by law enforcement agencies to prevent crime. Cameras can be installed in many remote locations and video data is transmitted over a government-only wireless network. An example of this application is the deployment of hundreds of wireless security cameras by the New York City Police Department on lampposts in many streets throughout the city.
Wireless range
The wireless security camera works best when there is a clear line of sight between the camera and the receiver. Outside the room, and with a clear line of sight, digital wireless cameras typically have a range of between 250 and 450 feet. Inside the room, its range can be limited to 100 to 150 feet. The walls of cubes, drywall, glass, and windows generally do not degrade the wireless signal strength. Bricks, concrete floors, and walls lower the signal strength. Trees in the line of sight of cameras and wireless receivers can affect signal strength.
The signal range also depends on whether there is a competing signal using the same frequency as the camera. For example, signals from a cordless phone or router may affect signal strength. When this happens, the camera image may freeze, or appear "choppy". The general solution involves locking the channel that the wireless router operates.
References
Source of the article : Wikipedia
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