| C Mount |
Long established industrial standard for connecting cameras and lenses, widely used in the CCTV industry. |
C.C.D. (Charged
Coupled Device) |
A ‘chip’ that performs the same function as a camera tube. |
C.C.I.R. (Comite
Consultatif
International des
Radiocommunications) |
The European TV standard 625 lines 50 fields. |
| Cable screen/shield |
A conductor which forms a sheath around one or more insulated conductors. This reduces the effect of interference onto the conductors. This shield is usually metallic foil or stranded wire wrapped around the conductors. |
| Card Number |
Coded number stored in the access control card. |
| Card Reader |
Unit fitted by the controlled door that reads the access card and transfers the information to the access control system. |
| Cardholder |
An individual who has been issued an access control card. |
CD-ROM (Compact Disc
Read-Only Memory) |
A compact disk format used to hold text, graphics and hi-fi stereo in excess of 650 MB of data, which is equivalent to about 250,000 pages of text or 20,000 medium-resolution pages. |
| Chrominance (C) |
The part of the video signal corresponding to the colour information. |
| Co-Axial Cable |
Any cable that has a conductor and shield sharing the same axis. |
| Composite Sync |
A signal comprising of both Line and Field sync pulses but without any video information. |
| Composite Video |
The full video signal, including both video data and sync pulses. |
| Compression |
A number of methods to reduce the size of digital information. See J-PEG, M-PEG and Wavelets. |
| Conditional Refresh |
Technique used in slow and fast scan where only small screen changes are transmitted. Up to a certain percentage of the on-screen picture can be updated before a full picture is required. |
| Controlled Area |
A location where entry and/or exit is under the control of other persons or a control system. An area where the entrance and exits are controlled by an access control system is a controlled area. |
CS Mount (Special C
mount) |
New standard for connecting cameras and lenses. It has a shorter penetration into the camera, needed for many modern CCD designs. |
CS to C Mount
Adaptor |
5mm spacer ring used to enable the use of C mount lenses on CS mount cameras. |
