Posts Tagged ‘ security camera industry’



Digital Recording Device

Written By:
Friday, September 2nd, 2011

A digital (audio) recording device, according to the U. S. Code of Regulations (Title 17, Chapter 10, Subchapter A, paragraph 1001), “is any machine or device of a type commonly distributed to individuals for use by individuals, whether or not included with or as part of some other machine or device, the digital recording function of which is designed or marketed for the primary purpose of, and that is capable of, making a digital audio copied recording for private use…”

Huh?  Let’s try this again.  A digital recording device is any device that records in a digital (binary) format.  There are all kinds of digital recording devices.  Since the technological advancements that have come with the computer age, many other industries have borrowed the same technology but may have modified it slightly to meet their specific needs.

As far as the digital video security and surveillance camera industry goes there are basically two digital recording devices that immediately come to mind.  One is the digital phone/room recorder and the other is the Digital Video Recorder or DVR.

Security Camera King offers two different digital phone/room recorders, product# DPR-N88 and product# DPR-N308.  These two recorders are audio digital recording devices.  They work by recording to a storage medium a stream of discrete numbers that represent the changes in air pressure or sound.  In contrast, analog sound is created from a continuous wave that represents the changes in air pressure or sound.

Basically using a simple set of the numbers 1 and 0 (called binary or digital format) just about anything that is recorded as an analog set can be converted to digital.  There are several advantages to digital recording devices.  First and foremost is that digital recording does not degrade in quality over time like analog recordings do.  Another advantage of digital recordings is that, thanks to the ever increasing technology of the computer industry, more data can be stored digitally than can be done by an analog medium.

While digital audio recording record the changes in sound, digital video stores information that represents the changes over time in chroma and luminence for video.  Once again, the older (analog) method of recording video was, like analog audio, the creation of a continuous wave.

The security camera industry reaped the biggest benefit from the “computer age” when they started using digital recording devices called DVRs (which are also the second type of digital recording device referenced above).  In the security camera industry the main digital recording device is the DVR.  There are several types of DVRs which use several different methods for storage as a digital recording device.

The most common digital recording device for full size commercial or residential security camera systems is the Hard Disk Drive or HDD.  The DVRs HDD is a non-volatile (will not lose recorded information when power is disconnected), random access digital recording device.  Security Camera Kings systems’ HDD storage options ranges from 500 Gigabytes (GB) to 8 Terabytes (TB).

The HDD consists of rotating rigid platters (disks) on a motor driven spindle.  Digital data is magnetically written to or read from the platter by read/write magnetic heads.   These heads are extremely close to the platters but they never touch them.  As a result when the heads are directed to read or write the platter spins and the head either searches and reads for magnetic changes on the platter or writes magnetic changes on the platter which is literally a series of 1s and 0s.

There are other types of digital recording devices too.  For example, Security Camera King’s product# HC-SUNGL-DVR are sunglasses with the camera and DVR included and built into the glasses.  Of course, in this case the digital recording device is not an HDD but an electronic circuit designed for digitally recording the video and audio.  These sunglasses not only have 4 GB of storage built-in, but the DVR can also accept Micro SD Expansion memory cards of up to 8 GB.

Well hopefully this article has given you enough knowledge about digital recording devices that you’ll know what to look for and how they work.  If you have any additional questions about digital recording devices and how they may apply to you please contact one of Security Camera Kings security experts today.

 

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DVR Security System Cameras

Written By:
Friday, May 6th, 2011

Today’s Digital Video Recorder or DVR security camera systems are an amazing bundle of new high quality technology.  The security camera industry can also thank the personal computer industry as a contributor, because a lot of today’s DVR security camera systems use recently invented technology borrowed from the computer industry.

In this article we are going to describe how a typical DVR security camera system works.

Modern digital video security and surveillance systems are basically component systems.  This means that essentially, the parts of the system are like plug n play items used in computers.  All of the components do not have to be made by one manufacturer, they can differ in function and still work on the system, and they can usually be removed and replaced with something else and the system will continue to work.

This provides tremendous versatility in application because the DVR security camera systems are no longer required to use all of the same components.  For example, an 8 channel system may have 6 bullet cameras and 2 Pan-Tilt-Zoom (PTZ) camera made by a totally different manufacturer.

 

Let’s take a closer look at how a DVR security camera system (and its individual components) works.  The first component of the system is the camera.  There are so many different type of cameras available today that we do not have the space for this article to cover them all.  Instead, let look at how they work

DVR security cameras possess one primary function; transfer the reflecting light that is in its field of vision into electrical impulses that can be measured, manipulated, and compiled to create a digital video file.  This information is then sent to the DVR and/or monitor for processing and viewing.

The camera does this by using one of two different electronic sensor chips called a Charged Coupled Device or CCD or a Complementary Metal Oxide Semiconductor or CMOS.  Although both sensors work a little differently, the both yield the same end product–the electrical data that can be used to create a digital video file.

This is accomplished by the camera’s lens focusing the field of view onto one of these chips, which generally range from only 1/4″ to 1/2″ square.  When the light strikes the sensor chip, small electrical impulses are created by the pixels in the chip.  Each one can be measured and used to create the data that will be used to display the cameras field of view as a digital video.

At this point the signal is still an analog type signal.  The camera sends this analog data through an analog-to-digital processor chip to convert the data into digital or binary format.  The camera also contains a Digital Signal Processor or DSP chip that is used to make fine adjustments to the data.  Once the digital information is ready it is sent via a video transmission cable or other means to the DVR, hence the name DVR security camera systems.

Once the signal reaches the DVR, it applies its own DSP technology along with a CODEC utility.  Codec is an acronym for COmpression/DECompression.  This utility program uses a special algorithm program that reduces the incredibly large file into just a fraction of its original size without sacrificing significant quality.  Once this is accomplished the digital video file is compiled and is saved on the DVR’s hard disk drive and/or displayed on a system monitor.

It should be easy to see now why DVR security camera systems benefit from technological improvement in the computer world.  Many PC based devices are used in security camera systems.  For example, the DVR saves the digital video file to its hard disk drive for storage.  USB Thumb drives can be used to update firmware and copy and transfer video footage.  DSP and memory chips are directly related to the computer industry.

Even the monitors used today are basically the same as computer monitors but they may include a few extra input options.  Monitors have gone from the bulky Cathode Ray Tube (CRT) type to the LCD type just like most computer monitors.

Security Camera King offers a wide selection of DVR security camera systems with everything you need to install it but the tools.  Try one of our systems, the Elite Mini Economy, the Elite Mini HD, the Elite Series, or the Ultimate Series and see for yourself.  The majority of our cameras come with a 1 year full warranty (some models have 2 years) and our DVRS have a 3 year warranty.

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DVR Security Camera systems

Written By:
Friday, May 6th, 2011

Today’s Digital Video Recorder or DVR security camera systems are an amazing bundle of new high quality technology.  The security camera industry can also thank the personal computer industry as a contributor, because a lot of today’s DVR security camera systems use recently invented technology borrowed from the computer industry.

In this article we are going to describe how a typical DVR security camera system works.

Modern digital video security and surveillance systems are basically component systems.  This means that essentially, the parts of the system are like plug n play items used in computers.  All of the components do not have to be made by one manufacturer, they can differ in function and still work on the system, and they can usually be removed and replaced with something else and the system will continue to work.

This provides tremendous versatility in application because the DVR security camera systems are no longer required to use all of the same components.  For example, an 8 channel system may have 6 bullet cameras and 2 Pan-Tilt-Zoom (PTZ) camera made by a totally different manufacturer.

 

Let’s take a closer look at how a DVR security camera system (and its individual components) works.  The first component of the system is the camera.  There are so many different type of cameras available today that we do not have the space for this article to cover them all.  Instead, let look at how they work

DVR security cameras possess one primary function; transfer the reflecting light that is in its field of vision into electrical impulses that can be measured, manipulated, and compiled to create a digital video file.  This information is then sent to the DVR and/or monitor for processing and viewing.

The camera does this by using one of two different electronic sensor chips called a Charged Coupled Device or CCD or a Complementary Metal Oxide Semiconductor or CMOS.  Although both sensors work a little differently, the both yield the same end product–the electrical data that can be used to create a digital video file.

This is accomplished by the camera’s lens focusing the field of view onto one of these chips, which generally range from only 1/4″ to 1/2″ square.  When the light strikes the sensor chip, small electrical impulses are created by the pixels in the chip.  Each one can be measured and used to create the data that will be used to display the cameras field of view as a digital video.

At this point the signal is still an analog type signal.  The camera sends this analog data through an analog-to-digital processor chip to convert the data into digital or binary format.  The camera also contains a Digital Signal Processor or DSP chip that is used to make fine adjustments to the data.  Once the digital information is ready it is sent via a video transmission cable or other means to the DVR, hence the name DVR security camera systems.

Once the signal reaches the DVR, it applies its own DSP technology along with a CODEC utility.  Codec is an acronym for COmpression/DECompression.  This utility program uses a special algorithm program that reduces the incredibly large file into just a fraction of its original size without sacrificing significant quality.  Once this is accomplished the digital video file is compiled and is saved on the DVR’s hard disk drive and/or displayed on a system monitor.

It should be easy to see now why DVR security camera systems benefit from technological improvement in the computer world.  Many PC based devices are used in security camera systems.  For example, the DVR saves the digital video file to its hard disk drive for storage.  USB Thumb drives can be used to update firmware and copy and transfer video footage.  DSP and memory chips are directly related to the computer industry.

Even the monitors used today are basically the same as computer monitors but they may include a few extra input options.  Monitors have gone from the bulky Cathode Ray Tube (CRT) type to the LCD type just like most computer monitors.

Security Camera King offers a wide selection of DVR security camera systems with everything you need to install it but the tools.  Try one of our systems, the Elite Mini Economy, the Elite Mini HD, the Elite Series, or the Ultimate Series and see for yourself.  The majority of our cameras come with a 1 year full warranty (some models have 2 years) and our DVRS have a 3 year warranty.

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IR Bullet Camera

Written By:
Monday, May 2nd, 2011

When looking for versatility in a digital video security camera nothing may offer you more than an IR bullet camera (InfraRed bullet camera).  Among the most popular types of cameras these days, the IR bullet camera usually comes packed with dozens of extra features, thanks to modern technology.  In the following article, we’ll take a look at digital video security cameras and how they work and especially how an IR bullet camera works.

There are three major types of digital video security cameras based on shape; the box type, the dome type, and the bullet type.  For many years the favorite has always been the box type.  Although box type cameras are somewhat obtrusive, they are versatile because you must purchase the lens separately, which allows you to change the field of view characteristics when ever you want.  Also, box type cameras are intended for indoor use, but can easily be converted to outdoor use by placing the camera in an outdoor rated housing.

Next in line is the dome camera.  Dome cameras are used indoors or outdoors but it seems as though the majority of their applications lean toward indoor installation and mounting.  These camera are fast becoming competitive with box cameras because they are small and unobtrusive, versatile with many features, and are easy to mount to the wall or ceiling.  Dome cameras can be purchased as indoor, outdoor, or indoor/outdoor models.  The can also be sold as vandal proof because once they are properly mounted on the ceiling it would be very difficult for a vandal to change the position of the camera.

Finally, there is the IR bullet camera or just a plain bullet camera.  They are so called because their shape resembles the shape of a bullet.  Bullet cameras may be mounted in several different ways.  Regardless if they are mounted on the wall or ceiling, bullet camera mounts normally have a bit of an extension arm that aids in getting the camera in the exact position you desire.  The down side to this is that the camera can become vulnerable to vandalism because it can be easily repositioned.

Now that we’re familiar with the types of cameras, let’s talk a little bit about how they work.  As a matter of fact, all three types of cameras produce digital video images in the same manner and this is how they do it.

The lens’ job is to gather the reflected light from images in it’s field of view, and focus them onto a very small censor chip (the chip ranges from 1/4 to 1/2 square inch).  The sensor chip is a high specialized electronic chip that can convert light energy into electrical energy.  The electrical energy can be measured and the values used to recreate the actual image as a digital video image on an electronic display monitor.

There are two different sensor chips that may be used and although they may go about producing the video image differently, the both produce the same result; digital video images.  The names of these sensor chips are the Charged Coupled Device or CCD and the Complementary Metal Oxide Semiconductor or CMOS.

These sensor chips are incredibly interesting because they possess an unusual trait.  They both are sensitive to near infrared radiation.  This is the type of radiation that is given off by TV remotes, DVD players, etc.  It is harmless to humans but even better for the security camera industry, it is completely invisible.  Therefore, it could be pitch dark and the camera can still produce a video image as if a spot light were shining in its direction.

It does this by the use of InfraRed producing Light Emitting Diodes or IR LEDs.  Generally, the more LEDs used to produce infrared “light” the longer the range of the camera in total darkness.  This is where the bullet camera comes in.

Due to its shape an IR bullet camera can really pack a large array of IR LEDs around its lens.  Some camera boast as many as 78 or more and a range if 300 feet.

To summarize, the IR bullet camera is a versatile digital video security tool.  It provides the same quality video as box camera but doesn’t require an additional housing.  It provides the capability for IR imagery like a dome camera but it has a much longer range potential due to the size and shape of the camera.

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640 x 480 Infrared Camera

Written By:
Monday, October 11th, 2010

What exactly is a 640 x 480 infrared camera? This can be a complicated answer for many reasons. In the following article we will attempt to address some of the characteristics that can make this seemingly simple question so complicated. Specifically, we will briefly discuss infrared technology and the reference to display resolution and how they relate to a 640 x 480 infrared camera.

First lets discuss the meaning of “infrared” when we talk about a 640 x 480 infrared camera. The term “infrared” refers to the wavelength of electromagnetic radiation. The wavelength of infrared radiation generally ranges between 0.7 and 300 micrometers abbreviated as “µm.” The exact range and categories defined may vary slightly depending on the scale that is used to describe the radiation.

For our purposes, it is sufficient enough to know that infrared radiation is a longer wavelength than visible light, therefore the human eye cannot see it. Further, there may be several categories of infrared radiation based on wavelength but we will only consider two; “near infrared” radiation which is invisible to the human eye but is the closest in wavelength to radiation that is visible to the human eye) and “long-wavelength” also called “far infrared,” which for our discussion is the thermal imaging region which is naturally emitted by objects and requires no external or artificial illumination.

So, on this basis there are essentially two types of 640 x 480 infrared cameras. The first type, and the one most commonly used in digital video security camera systems, is the near infrared camera. This camera contains one of two electronic sensor chips, either a Charged Coupled Device (CCD) or a Complimentary Metal Oxide Semiconductor (CMOS). These sensors are able to convert the light energy into electrical energy that can be measured, thereby creating a digital image. Fortuitously, these sensors inherently detect near infrared radiation as well.

The near infrared 640 x 480 camera uses external infrared radiation (or infrared light) to illuminate the area in its field of view. These cameras use InfraRed Light Emitting Diodes or IR LEDS to illuminate the target area in order to create an image. The IR LEDs are normally configured in an array that surrounds the camera lens so that they are focused in the same direction. However, some cameras may have IR LEDs clustered off to the side of the lens and there are even separate “illuminators” that contain nothing but IR LEDs and can be mounted and aimed separately from the camera.

These cameras normally produce a color image in visible light conditions and when the visible light is not bright enough to produce a high quality video image, they switch to infrared, producing a monochromatic or black and white video image.

The far infrared 640 x 480 infrared camera does not require additional external infrared illumination. This camera uses an infrared “Focal Plane Array” or FPA sensor and is capable of creating a digital video image based solely on the thermal emissions or “heat signatures” of objects. These cameras are often called “Forward Looking InfraRed” or FLIR cameras. These cameras are also often made in a “hand held” version. Older models of these cameras had to be cooled somehow to prevent the users’ and their own thermal emissions from interfering with the image.

Far infrared 640 x 480 infrared cameras are often used not only for covert surveillance and security, but by inspectors and engineers to detect a variety of heat signatures. These cameras can be used to detect areas of heat “leakage” from a building or “hot spots” on mechanical engines and other devices.

As for the reference of “640 x 480″ in a 640 x 480 infrared camera, this refers to the image resolution in pixels that the camera is capable of displaying. Far infrared cameras are more commonly referred to by their resolution in pixels, i.e. 640 x 480 infrared camera. However, digital video security cameras may also use the same description.

This can be confusing because older, analog security video cameras more commonly referred to their resolution in terms of TVL or Television Lines. Since the security camera industry today uses primarily digital video cameras, they may refer to the resolution in terms of TVL or pixels.

Perhaps the easiest way to tell the difference between the two is the price. Near infrared digital image security video cameras can be purchased for as low as less than one hundered while far infrared FLIR cameras range from one to several thousand dollars.


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