Digital Recording

DVR:

Digital Video Recorder. There are numerous recorders available on the market. From simple boxed units to sophisticated PC based systems At Nightowl Security we offer a boxed economical unit, right up to the PC based units. Nightowl design and assemble our own PC based recorders. This gives us the advantage of being able to design a system to your exact requirements, as well as giving us the advantage of doing on site repairs. By being able to do this means there are no lengthy interruptions if your system malfunctions. We are able to recover lost data in certain conditions. Drives that are changed can be stored for any future data retrieval.

Components of the DVR:

  • Frame Rate: The frame rate or images per second (IPS) dictates how much of a gap or jump there is between pictures. This is important when watching suspects or incidents where continuity is crucial. E.g. Public Liability or honesty issues. Digital systems allow you to control the frame rate of individual cameras thereby allowing you to prioritise important cameras. Top of the range systems can record up to 400 frames per second across 16 cameras.
  • File Size: The file size relates to the amount of information the DVR retains from each image. The higher the file size the closer the recorded information is to the live picture. The important thing with any digital system is that the priority cameras can be allocated larger file sizes to improve quality. It is important to realise that the higher the file size the more hard drive space is used.
  • Hard Disks: The information recorded is stored on hard disc drives (HDDs) similar to those in a computer. The larger the HDD the longer the system can store the information for. Hard drives can be internal or removable and the requirements of the system will dictate which is used. The hard drive uses a first-in first-out system whereby the oldest information is recorded over first giving you a continuous rolling amount of storage. It is important to realise that cameras set up to record on motion can mean that the system gives a varying amount of stored information depending on the level of motion detected. The increasing growth in the size of hard drives means that systems can record for longer periods of time.
  • Archiving: Incidents can be copied from the hard disc onto a CD or DVD. The original incident is watermarked and this watermark is carried over onto the disc.
  • Software: The PC based software comes with the following programmes: POS (Point of Sale) both serial and TCP/IP, Email, SMS, Alarms, IP Camera support, multi monitor outputs (in conjunction with the installation of graphic cards) Spot monitor per 16 channels, resolution settings, Audio channels, to name but a few. Advanced analytics is also available.
  • Remote View: Remote view is available via the Web and or utilising the CMS control software. Most DVR`s today can be connected to your smart phone and or I Phone.

NVR: Network Video Recorder: The NVR is very similar to the DVR comprising of most of the components as well as software. The main difference is that you do not need a capture card. The system is software based. Generally the NVR needs to be a more powerful system than the DVR in that the processing power and Ram need to be of higher specs. 

 


Advantages of Digital Recording

- Ease of retrieval (search by time & date/motion)
- Quality of recorded images
- Large storage available and Archiving to CD or DVD
- System upgrades simple
- Minimum user interaction with system
- Password protected