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SVR8000 Series DVR Comparison

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CCTV Glossary
The following is a list of commonly used terms related to CCTV, with a brief description of the meanings. These terms are not specific to Bolide Technology Group, they are general terms used throughout the CCTV industry. If you don't find the term you are looking for, or you find any error, please contact us.
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Digital Video Recorder (DVR)
This is a device that records video signal digitally. Normally this is on a large hard drive in the machine. For this reason it is sometimes known as a hard disk recorder (HDR).

Direct Drive (DD)
Some auto iris lenses require a DC signal from the camera. These are known as direct drive lenses.

Depth of Field
Depth of field (also known as depth of focus) refers to the range of distance from the camera that is in good focus. The smaller the aperture of the lens, the longer the depth of field. However, less light coming into the lens, means that the image will be dimmer, so the camera needs to compensate by increasing the gain. For example, the best (longest) depth of field would be obtained on a bright, sunny day, with a very small aperture on the camera. In this case the imaging device still gets a reasonable amount of light, even with a small aperture. The worst (shortest) depth of field would be in a dark room, with a large aperture. To improve depth of field, the best approach is to increase the amount of light on the subject, or use a more sensitive camera.

Decibel (db)
The decibel is a logarithmic scale. In the context of CCTV it refers to voltage or signal strength. A 6db increase is equivalent to doubling the signal strength.

Distribution Amplifier
This is a device that accepts one video input and sends it out to 2 or more devices. This is often used in a situation where the signal needs to be split between a number of video monitors or recording devices. 2 or 3 devices can often (but not always) be driven just by splitting the signal with a "T" connector, but more than that, and invariably a distribution amplifier is required to give an acceptable signal quality.

Digital Versatile Disk (DVD)
Sometimes called digital video disk. This is an optical disk the same size as a CD, used for storing data of various formats. Including video, audio and computer data.