Posts Tagged ‘ dvr unit’



Hidden Camera With SD Card

Written By:
Wednesday, February 9th, 2011

There are times when covert camera monitoring and recording are necessary and one of the best devices for this purpose is a hidden camera with SD card. Thanks to recent technological advances in the computer world as well as in general electronics, a camera can be made as small as to fit in the shell of an average writing pen.

When it comes to the appearance of a hidden camera with SD card, there are many types from which to choose. These cameras come in “bare-bones” mini versions, where the camera is basically undisguised but is small enough to be hidden, to disguised versions that look (and often times function) as clocks, mirrors, safes, stuffed animals, and many more.

But what exactly is a hidden camera with SD card and how is it able to work? We’ll answer those questions and more in the following article.

The secret behind the success of the hidden camera with SD card is its incredibly small size. Another technological feature is its relatively low demand for power consumption. Yet another is the ability to save digital video images to an SD card, a relatively small device that can pack a big punch in memory capacity these days. Let’s start from the beginning.

A digital video security camera system works by capturing color digital video images with the camera, transmitting those images to the Digital Video Recorder or DVR unit, and saving them on the DVR’s hard disk drive and or displaying them on a monitor. Technically, a monitor is only needed for the system to set it up; that is, fine tune and adjust initial settings. However, if the user wants to monitor the digital video live (or later) the monitor will be needed. The important point here is that a digital video system can consist of just a digital video camera and DVR.

Basically that’s exactly what a hidden camera with SD card is; a digital video camera with a DVR. The key component of the digital video camera is the sensor that is used to create the digital video image. One of two different types of sensors, a Charged Coupled Device or CCD or a Complementary Metal Oxide Semiconductor is used. Generally speaking, a CCD provides the highest quality image at the price of power consumption while a CMOS provided a good quality image at a much lower demand for electrical power.

As technology continues to increase, the power demands for the CCD become much less and the quality for the CMOS becomes even better. Since many hidden cameras with SD card are standalone units placed inside other objects to disguise their appearance, power consumption may be an issue. For that reason many hidden camera with SD cards use CMOS sensor chips.

Although the CCD and the CMOS work a little differently, they both produce the same outcome, a relatively high-quality digital video image. They do this by transferring light images into electrical impulses. These impulses can be measured and compiled into data that creates a digital video image.

One of the most impressive features of digital video cameras is that they can produce these high quality digital video images with a CCD or CMOS the size of a square that is only 1/4 inch! In addition, a wide angle lens is usually used to focus the image on the sensor and these lenses are often as small as 3.7 mm in diameter. Obviously, the small sensor chip and lens combination “paves the way” for camera to be used in other devices as a hidden or disguised camera.

After the camera has created the data for a digital video image micro-circuit technology take over from there. First, an on-board analog-to-digital converter chip transfers the analog data into digital data. Then another circuit compiles and condenses the data to create a digital video file. The digital video file is saved by the DVR, however this cameras DVR records to an SD (Secure Digital) card instead of a hard disk drive.

SD cards are non-volatile memory containers that are used in many electronic devices such as cameras, cell phones and MP3 players. All the user has to do is remove the SD card, plug it into their computer, and download the digital video file created by the hidden camera with SD card.

On-board power for hidden cameras with SD cards may be supplied by a battery, or the camera may actually tap into the power of the device in which they are hidden.

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Hidden Camera In TV

Written By:
Tuesday, February 8th, 2011

Ever need to watch those who are watching? That’s exactly what a hidden camera in TV can do. In fact the possibilities for different types of hidden cameras are nearly endless these days, thanks to 21st century electronic technology.

The current technology that abounds is so compact and efficient, that a hidden camera in TV is rather simple, especially considering the fact that we currently have hidden color cameras that are made to look like the head of a typical Phillips screw. (See Security Camera Kings product# HC-SCREW-WC or go to http://www.securitycameraking.com/wired-color-screw-camera-58967-prd1.html).

Putting a hidden camera in TV is easy because there is usually lots of spare room inside the television set case to allow for the camera and accompanying electronics. Who would suspect that the television is actually watching them?

Perhaps the real question here is not how they put a hidden camera in TV, a screw, a stuffed animal, a clock, or just about any other object but what is it about the technology that makes such a thing possible? In the following article we’ll describe how a miniature hidden camera works and mention some the technological improvements that have occurred over the past few years to make this possible.

There are two types of digital video security and monitoring, overt and covert. Overt monitoring occurs when no attempts to conceal, disguise, or hide the activity to monitor or record images are made. Covert monitoring is just the opposite; the camera and other equipment is hidden, concealed, or disguised so as not to readily reveal its presence. In the world of security and surveillance, both overt and covert monitoring is needed. Thus, the demand has created the need for a device like a hidden camera in TV.

Covert monitoring devices may include just the camera or it may include an entire miniature digital video security camera system. A typical full-size digital video security system not only has cameras, but a Digital Video Recorder or DVR and an optional monitor as well. Hidden miniature digital video security camera systems also include the camera, but in addition, contain a miniature DVR as well. But before we get ahead of ourselves, let’s talk about the technology that allows this to happen.

First a full-size standalone digital video system uses digital video cameras that send their digital video signals to the DVR unit. The DVR unit also contains a highly specialized computer processor called a Digital Signal Processor or DSP. The processor is like the processor in a personal computer but is designed to operate specifically to deal with digital video data. The DSP gathers the digital video data sent to it by the digital video camera and creates a digital video file that can be viewed live on a monitor and/or stored in a digital file format on a hard disk drive on the DVR.

Miniature systems, like a hidden camera in TV system, also have a camera and a DVR. However, the DVR circuitry is contained on a small Integrated Circuit (IC) chip and is either stored in on-board (another type of IC chip) memory or on an SD card or similar device. As technology improves, memory chips become smaller and smaller while their capacity for storage becomes greater. This is just one of the features that provides for making miniature digital video security systems possible.

As for the cameras, there are several technologies applied here to make the devices incredibly small while still yielding fluid, relatively high-quality video. First, many hidden, miniature digital cameras use a highly refined wide angle lens. This lens provides the camera with a significantly wide field of view even though the lens itself is often only 3.7 mm in diameter.

Next the electronic sensor chips used to convert the focused light reflected from the image through the lens can be incredibly small. Typical sizes for these sensors called Charged Coupled Devices or CCDs or Complementary Metal Oxide Semiconductors or CMOSs is 1/4, 1/3, and 1/2 inch square – and that is for full sized cameras.

Finally, as already mentioned IC chip technology continues to get smaller and more sophisticated over time. This allows for an analog-to-digital converter circuit and transmitting circuits to exist in miniature IC chips. So when all of these technological improvements are packaged neatly and tightly together, many covert recording devices are possible, including a hidden camera in TV.

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Infrared Wireless Security Camera

Written By:
Sunday, January 30th, 2011

An infrared wireless security camera offers the ease of do-it-yourself installation and the versatility of total darkness digital video recording. Weather you choose and indoor or outdoor type camera, these cameras can be mounted just about anywhere provided you can provide them with a power source to operate. In addition, infrared wireless security cameras do not require any other special add-on equipment to function.

Infrared wireless security cameras are used for many different applications. The following is just a short, partial list of some of those uses:
• Residential Indoor Applications. In areas that are not always lit, such as storage areas, garages, or any room that is dark. These cameras are excellent for use as baby monitor cameras.
• Industrial (and/or Commercial) Indoor Applications. In any area that is not well lit especially storage facilities, chemical or hazmat storage and use areas, retail store “back” rooms, night time exits and entrances, etc.
• Residential Outdoor Applications. Anywhere outside the house that you want to cover a perimeter zone that surrounds the house: Drive ways, garages or shops not attached to the main home, entrance gates, boats, and barns.
• Industrial (and/or Commercial) Outdoor Applications. Outside store perimeters, no-trespassing areas that may be difficult to patrol in darkness, night-time (or no-light condition) equipment operation areas, rooms and offices that are vacant at night, areas where money and other valuables are stored.

These cameras have the added advantage of performing as a normal visible light digital video camera when sufficient light is available and as an infrared light digital video camera when there is an insufficient amount of light. When the cameras are operating under visible light conditions, they provide a high-quality color display; and when operating under infrared conditions they provide a high-quality black and white or monochromatic video image.

As the description indicates, an infrared wireless security camera does not require the use of a video transmission cable. Non-wireless cameras must have an RG-59 coaxial or similar cable run from each camera to the Digital Video Recorder or DVR. This cabling can complicate installation and some users may feel that, although the cable can be hidden most of the time, when it is visible it can be obtrusive.

Infrared wireless security cameras use one of many different types of wireless technologies to send their video data to a corresponding receiver, or directly to a DVR unit that has a built-in receiver. One of the most popular wireless technologies used for this purpose is the 2.4 or 5.8 GHz technology due to its crisp, clear mostly interference free transmission/reception. (This is the same technology used on many landline-based wireless telephones.)

If the signal is received by a corresponding wireless receiver, the receiver is usually located near the DVR unit and is connected to it by a cable. Some DVRs made specifically for wireless applications have on-board receivers that “catch” the cameras’ transmission and relay it directly to the DVR for further processing.

Most infrared wireless security cameras radio technologies are based on something called a Line Of Sight range or LOS. An LOS range means the camera’s maximum transmission range is based on LOS. This means the camera’s maximum transmission is specified based on a situation where there is an unobstructed view (or LOS) between the camera and the receiver. Although obstructions do not usually cancel the transmission, they do reduce the maximum range based on their material composition.

The interesting thing about infrared wireless security cameras is that they are intrinsically sensitive to infrared radiation. The digital video camera uses one of two sensors, a Complimentary Metal Oxide Semiconductor or CMOS or a Charge Coupled Device CCD, to convert light images into electrical signals that create digital video images. Both of these sensors can detect not only visible light, but infrared light of the near-infrared wavelength. Furthermore, the cameras’ sensors can “see” the infrared light, but the human eye cannot. There for the light used for infrared illumination is literally invisible to the human eye.

Infrared wireless security cameras normally used infrared Light Emitting Diodes or LEDs to create the illumination for the camera. These LEDs may be configured in an array surrounding the camera lens, off to the side, or entirely separate on an infrared “illuminator.” Generally, the more LEDS the longer the range of capturing in total darkness conditions. For that reason, always check the specifications before purchasing the camera to make sure it meets your required range.

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