Posts Tagged ‘ wireless security camera ’

Wireless TV Security Camera

Tuesday, September 14th, 2010

A wireless TV security camera has many uses both around the house and in business. Thanks to modern technological advancements and reduced costs of electronic components anyone can own a wireless TV security camera and can use it just about anywhere.

There are several variations of wireless TV security cameras, and these days the phrase “wireless TV security camera” may have more than one meaning. Many advertisements, vendors web pages, etc. may describe their product as a wireless TV security camera, when in fact it may not be a true TV type security camera. Usually the meaning of “TV” when used with security cameras and systems refers to the ability of the system to use a television as a monitor or to play back recorded video footage.

Standard wireless security camera systems usually work in tandem with an LCD monitor such as the type of monitor that is commonly used on today’s personal computers. It can be confusing if the phrase is used incorrectly, giving the impression that a wireless “TV” security camera that requires the resolution of a typical LCD personal computer monitor can be used on an average television set.

For the purpose of our discussion in this article, a wireless TV security camera means a wireless security camera that can be used along with a television as either the real-time (live) monitor or for viewing recorded video footage. Also, we’ll briefly describe a typical standard security system setup so that you might better understand the differences of a wireless TV security camera system.

A basic digital video security camera system consists of one or more digital video cameras, a Digital Video Recorder or DVR, and a monitor. Each camera has two different wires running to it. One wire is a small thin wire carrying the low voltage Direct Current (DC) from a power distribution center or a plug-in transformer. If a power distribution center is used than each camera will have a line run out to it from the location of the power distribution box. In addition, each camera will require a larger RG-59 coaxial video transmission cable run from it to the DVR.

The digital video camera uses an electronic sensor chip to convert light waves into electrical energy that can be used to create a video image. The information (video data) that is created by the camera is sent to the DVR for processing by way of the coaxial video transmission cable. Most DVRs include a processor that uses a special compression program to reduce the size of the incredibly large digital video file. This has two advantages: 1) By making the video file smaller it allows for more footage, i.e. longer amounts of time, to be stored on the DVR; and, 2) The smaller file is easier for the processor and DVR to handle.

After the processor has compressed the video data and created a digital video file, the file is stored on the DVR. It may also be viewed instantly (live) on a video monitor. Most monitors used today have resolutions much higher than that of a standard cathode ray tube (CRT) television. However, it is true that as time progresses, our televisions are becoming more and more like computer monitors with high definition increased resolution.

A wireless TV security camera works much the same way with a couple of exceptions. First, the wireless TV security camera does not require the coaxial video transmission cable. The camera has an on-board transmitter and antenna and it broadcasts its video signals via radio waves to either a corresponding receiver or combination receiver DVR. Wireless cameras use all sorts of technology to send their signals but the 2.4 and 5.8 GHz band radio technology like that used in home wireless phones is probably the most common.

The second exception for wireless TV security cameras is that the camera’s video picture may be viewed on an average television set. This can be done because the camera either records in a format that is compatible with a television set or the receiver/receiver DVR combo displays the video footage in a format that is compatible with a standard television set.

There are several uses for wireless TV security cameras where viewing the camera’s images on television would be convenient. Just a few examples of these applications include using them as baby monitors, elderly care monitoring, and many other uses around the home as well as the business.


Outdoor Wireless Security Camera Package

Friday, June 4th, 2010

An outdoor wireless security package is an excellent choice for use in both business and residential applications. Standard outdoor wireless security packages are available that contain all the necessary components to provide digital video security and surveillance monitoring or you can create your own package with components that are suited to your own needs.

A basic outdoor wireless security package contains the following components:

  • • One to several outdoor wireless digital video cameras
  • • A receiver unit or units
  • • A processor or capture board with CODECs
  • • A monitor and,
  • • A Digital Video Recorder or DVR

Outdoor wireless cameras differ from indoor wireless cameras primarily in the way the camera is encased. Most outdoor security cameras are enclosed in a housing that prevents entry of dust particles and water and protection from weather elements like wind, hail, and snow. These cameras may have an International Electrical Code standard Ingress Protection rating or IP rating. Most outdoor wireless cameras are rated as IP66 or IP67 which means they offer complete protection from dust and water (IP66) or dust and being submerged in up to 1 meter of water (IP67).

There are several options available for an outdoor wireless security package in regard to the camera types. Standard outdoor wireless cameras provide high quality color video in normal lighting conditions. Day/night vision cameras contain a sensitive light sensor chip called a Charge Coupled Device or CCD that can produce a video image in very low light conditions, such as a moonlit night.

These cameras are often rated in terms of light intensity sensitivity called Lux. Typical outdoor non-direct sunlight intensity ranges from 10,000 to 30,000 Lux. By contrast, a typical moonless clear night sky has an available light intensity rating of about 0.002 Lux. Some outdoor wireless day/night vision cameras are capable of producing images with only 0.002 Lux of visible light.

Another camera choice for an outdoor wireless security package is a night vision infrared (IR) camera. These cameras can produce clear, high quality monochromatic or black and white video images in total darkness.

CCDs are inherently sensitive to IR light or radiation. IR cameras have several IR Light Emitting Diodes or LEDs that surround the camera lens. These LEDs emit infrared light which is invisible to the human eye. However, to the specialized CCDs in these cameras, the LEDs produce IR light that acts light a flood light or spot light on the target area of the camera.
An outdoor wireless security package can also be purchased with cameras that contain pan, tilt, and/or zoom (PTZ) features. These functions can be controlled manually by remote control or automatically. Programmed automatic PTZ cameras can detect motion and track objects such as cars in parking lots or individuals.

Lastly, an outdoor wireless security package can include cameras that can also record audio.

The wireless cameras in these packages may contain rechargeable batteries but most often contain a power source that supplies power to the camera via a small wire. Although most “wireless” security cameras still require the power wire, the coaxial transmission wire that would normally be run from each camera to the processor is not required. These cameras transmit the video image via on-board antennae instead of by cables.

Most outdoor wireless security package cameras transmit the images utilizing the 2.8 or 5.8 MHz radio band technology. The image is transmitted to a corresponding receiver. Most receivers can receive separate video simultaneously from up to four different cameras. Packages that require more than 4 cameras often include additional receivers with different channels.

The receivers relay the video image data to a processor or capture board that interprets the data and creates a digital video file that can be viewed immediately or stored for later use. Digital video files contain enormous amounts of data anc can be incredibly large for only a few minutes of recording time, so a COmpression/DECompression (CODEC) application is normally used. The CODEC reduces the size of the digital file drastically while maintaining the quality of the image. This allows for increased storage on the DVR and easier handling by the processor.

The DVR is very similar to a hard drive on a personal computer. The digital video files are stored on the DVR until it is full and are then rerecorded.

Thanks to modern technological advancements, an outdoor wireless security package can be custom designed to fit your situation and still be affordably priced.


Wireless Security Camera with DVR Systems

Thursday, May 6th, 2010

Wireless security camera with DVR systems may be exactly what you need if cabling security cameras is not an option for you. There are several other good reasons for utilizing wireless security camera with DVR systems. Let’s look at the components of a typical system and see how it operates.

The basic components of wireless security camera with DVR systems are the wireless security/surveillance camera(s), a wireless receiver, a CODEC or capture board, and the Digital Video Recorder or DVR. Additional accessories can include a CD/DVD writer for archiving files, pan/tilt devices, add-on microphones, and additional lenses to name a few.

The key to wireless security camera with DVR systems is of course, the wireless camera. While there are security cameras that operate from rechargeable battery packs, a wireless security camera is not totally wireless. All security cameras need some sort of power supply and if the camera is not battery operated, wires will be needed to supply the camera with the required electricity. The term “wireless security camera” typically refers to the fact that the camera does not require wires, usually in the form of coaxial cable, to transmit its signals. Instead, the cameras used in wireless security camera with DVR systems normally transmit their images as radio signals via antennae using the 2.8 GHz or 5.8 GHz band. This eliminates the cabling that would be required from each camera to the receiver or DVR unit.

Wireless cameras come in many types and sizes and because of modern technological advancements can offer all the features of a non-wireless camera. Some of those features may include pan/tilt/zoom capability, audio recording, day/night vision, infrared or IR imaging, indoor/outdoor usage capability, and internet or IP networking. The type of wireless camera you use is dependent on your needs, so be sure to purchase cameras that can fulfill your monitoring requirements.

The next component in wireless security camera with DVR systems is the receiver. Typical wireless system receivers can receive and/or process up to 4 cameras at a time. Usually, if the system has more cameras than four, additional receivers are added to accommodate the additional cameras. Each camera is assigned a “channel” on the receiver; hence 8 channel systems usually have 8 cameras with four cameras or channels on each of two receivers.

After the receiver accepts the cameras’ transmissions, they are processed using either software or circuitry boards or both. The processing creates useful digital picture/video files out of the data sent by each camera while reducing the size of the file to allow for ample recording and storing. This processing is known in the computer industry as Compression and Decompression processing and is usually referred to in the abbreviated form, CODEC. Common types of CODECs include MJPEG and MPEG4 as well as the relatively new format H.264.

Once the data has been processed and the files size compressed, it is transferred to the DVR for storing. A DVR is basically the same as a personal computer’s hard drive; it is a high-speed magnetic disk that can store tremendously large file sizes. Typical DVRs today have a capacity of at least 250 to 500 Gigabytes and may go as high as 1 Terabyte.

DVRs keep track of where the beginning of the recording takes place on the hard disk so that when the maximum storage capacity of the disk has been reached, the DVR can begin recording over the older stored files at the beginning of the disk. Depending on the CODEC and storage capacity of the DVR, this can provide you with several hours to several days of continuous recording without recording over earlier files. This is advantageous because it provides a buffer of time before the rewriting of new files will eliminate the earlier files. Usually, most systems come with additional options such as USB thumb drive support or internal or external CD/DVD drives that can be used to permanently save or archive footage (for example, when needing to provide a copy to police departments or as evidence).

Wireless security camera with DVR systems can fulfill your requirements for a security/surveillance camera system as needed without using the sometimes cumbersome coaxial cabling for transmission of non-wireless cameras. This also has a tendency to offer a little more freedom in the choice for placing cameras which may provide ultimately better surveillance coverage. Make sure you are aware of just exactly what functions you need so that you can make the correct choice when purchasing wireless security camera with DVR systems.