• 11May

  Security Dvr

  Security & Alarm Systems No Comments

  Security DVR for Surveillance and Safety

  

  dvr security system

  DVR stands for Digital Video Recorder. It is faster and easier to manage than non-digital and analog systems. Moreover, it provides instant access to recorded or live video. You need not worry about storage, too, because the bulk of video that can be stored on a single disc tremendously outweighs that stored on tape. In fact, a single disc is the equivalent of over 30 VCR tapes.

  There are two types of DVRs, PC-based models and stand-alone units. PC-based DVRs come with 4, 8, 12, 16, or 32 camera inputs. These security DVR systems convert analog signals to digital signals and compress them. The compressed data is then stored on a hard drive for archiving and playback. By entering the date and time using their on-screen menus, PC-based DVR systems allow you to search and easily retrieve images and videos of any point in time.

  You can access a DVR surveillance camera system from a remote location using any TCP/IP network or dial-up connection. The PC-based DVR has the added advantage of allowing you to connect more cameras when you install multiple DVR cards in your computer. These capture cards are available from INOX, AverMedia, and GeoVision.

  You can also opt for stand-alone DVR systems. It can be operated by the simple push of a button and does not require the use of a PC. They come with 4, 8, 9, or 16 camera inputs. Because their video is compressed less than PC-based units, stand-alone DVR security systems offer better picture quality. The software of these DVR surveillance systems is often more stable than PC-based DVRs.

  Standalone DVR units are very efficient when used for home security. They allow you to monitor your security cameras while you watch TV. They also include an IR remote that lets you control the live video from your security camera. If you want to record and store this data, then get a stand-alone DVR model that includes a hard drive.

  Security DVR systems provide detailed images and crystal clear video that do not degrade. They also allow you to record video for a longer period of time and let you pause the video without distorting the picture.

  Here are some tips to help you buy the right DVR cards:

  1. Always check the card’s frames-per-second display. The frames-per-second designation is the rate at which you can view the video. Thirty frames per second is the average rate of playback according to the National Television Standard Committee. Also, be sure that this rating is quoted on a per-channel basis.
  2. Check the codec processor. Codec is the acronym for compression-decompression. This is a program that allows the DVR to capture videos. If at all possible, purchase an MPEG-4 Part 10 Codec. This is the latest and most efficient codec available today, which gives you high-definition images.
  3. When buying a security DVR card, check the file size. The larger the file size, the sharper the video image. Keep in mind too that the faster the rate of transmission, the less storage space in your hard drive is required.

  Also check reviews about Cctv Security and Security Alarms

  Tags: dvr, dvr card, dvr security system, security dvr

• 04May

  Cctv Security Cameras

  Equipments, Security & Alarm Systems No Comments

  Making the Right Choice for Cctv Security Cameras

  

  security cameras

  There are normally six things to look at before Selecting a CCTV security systems;
  1. Camera Selection
  2. Recording Options
  3. Detection
  4. Time and Date Stamping
  5. Cable and Connectors
  6. Camera Protection

  1.0 Camera Selection
  1.1 Location
  Is the camera to be located indoors or outdoors? If outdoors then you need to ensure that it is appropriate for the environmental conditions that are likely to be encountered such as rain, snow, sun-glare, low light etc.

  1.2 Light Levels
  An ordinary colour or even monochrome camera will not give very good pictures in low light conditions although the monochrome will perform better than an equivalent colour one. Solutions available for low light conditions can include:

  * B&W cameras with built in IR illumination
  * Colour Day / Night cameras
  * Use of additional security lighting
  * Use of a separate IR illuminator in conjunction with a monochrome camera.

  1.3 Colour, Black and White or Day Night Cameras
  B&W cameras generally provide better image quality than colour ones at lower light levels. Colour cameras require the availability of good lighting and will generally provide better recognition capability. Day Night cameras provide the best of both worlds in an external environment.

  1.4 Wired or Wireless
  Wireless CCTV cameras are easier to install. Typical range for wireless camera systems is 100m free-space but this can reduce significantly to around 20 meters in a typical household environment.

  1.5 Visible Deterrence or Covert / Discreet Monitoring
  For visible deterrence the use of larger cameras housed in traditional enclosures are ideal:
  - Very small and can be installed in covert locations, or
  - In enclosures designed to disguise the presence of a camera.

  1.6 Audio
  If the ability to monitor or record sound is important then the camera needs to have a built-in microphone.

  1.7 Camera Viewing Quality
  Resolution - This is expressed as the number of television lines (TVL) that the camera is capable of producing. The higher the TVL value the greater the resolution and hence the quality of the images. A typical entry-level camera will be around 300 TVL with higher resolution cameras having a value of 400+ TVL.

  Size - A larger image sensor will give a better image definition than a smaller sensor. For example, a 1/3″ image sensor will produce a better image than a 1/4 ” sensor.

  Type - There are 2 types of image sensor. CMOS sensors are mass-produced and used in entry-level cameras to provide cost savings. CCD sensors are used in professional CCTV cameras and provide a higher quality image.

  2.0 Recording Options

  2.1 Domestic VCR
  VCRs can be used to provide continuous recording of up-to 8 hours or event led recording when used in conjunction with a PIR camera and a VCR activator.

  2.2 Domestic DVD Recorder
  These operate on a similar principle to the domestic VCR but offer the additional benefits such as higher quality digital recording, increased storage capacity, improved search and retrieval capability.

  2.3 Standalone Digital Video Recorders
  Essentially a DVR is a standalone piece of hardware that is designed exclusively for recording CCTV footage. It has a number of Digital Security camera recorders clear advantages over the traditional analogue systems and these include:

  * Storage Capacity - Days, weeks and even months of high resolution recording is possible through use of large capacity hard drives
  * Consistent Quality Recording - No deterioration of image quality no matter how many you overwrite onto the recording device or how long you store the images for
  * Viewing and Retrieval - Quick and easy access of footage due to digital format
  * Transfer and Storage -Transfer and storage capability is further enhanced by DVRs with built-in CD writers and USB ports.
  * Remote Access - Many DVRs have the capability for remote access from anywhere in the world through use of a remote PC
  * Multiplexed Recording - Capability to view and record multiple cameras simultaneously.

  2.4 PCI Cards
  These are digital video capture cards that can be fitted inside your existing PC to allow the connection of multiple CCTV cameras.

  3.0 Detection
  Event-led recording is a more efficient means of capturing relevant footage and can be achieved by:
  -PIR Movement Detectors
  -Video Motion Detection

  4.0 Time and Date Stamping
  This feature superimposes the time and date onto your CCTV footage.

  5.0 Cable and Connectors
  Co-axial cable with a local power supply to the camera can enable the camera to be sited upto 250m away from the monitor or recording device.

  6.0 Camera Protection
  This not only saves your security cameras from vandalas but protects any evidences collected during the vandal acts.

  You may wanna check our reviews about Camera Cctv and Cctv security

  Tags: cctv security camera, cctv security cameras, security camera, security cameras

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