Sony SSC-C108P Handbuch - Seite 8
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- 1. Table of Contents
- 2. Introduction
- 3. When and Where Should It be Used
- 4. Light
- 5. Choosing a Camera
- 6. Selecting the Correct Lens
- 7. Which Monitor
- 8. Transmission of Video Signals
- 9. Video Switching and Multiplexing
- 10. CCTV Systems Control
- 11. Recording
- 12. Sony CCTV Products
- 13. Basic CCTV Terminology
- 14. Basic CCTV Terminology
What is
Television?
Closed Circuit Television (CCTV) is a television system which operates on a
'closed loop' basis. Unlike broadcast television, which is available to anyone
with a suitable receiver, CCTV pictures are only available to those directly
connected to the loop.
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power supply
CCTV was first used in the 1950s and has since become an essential element in
any professional security system.
In most installations, the loop is a physical link – a cable which carries the
picture from the camera to the viewer. With very few exceptions, the pictures are
transmitted as a composite video signal at 75ohms, 1 volt peak-to-peak. Where
very high resolution (>400TV lines) is required, some equipment offers a Y/C facility
where the luminance signal (Y) and the chrominance (C) is divided. Over long
distances, for example in Town Centre systems, fibre optic transmission has
become popular. Where this option is too expensive, ISDN offers a cost-effective
alternative for event-driven surveillance systems.
As well as the full range of property protection and control applications, CCTV
offers benefits in many other areas, for example:
Assisting police authorities in the monitoring of traffic flow and the
implementation of prompt action in case of accidents and other emergencies
Supporting process industry managers as they control the flow of work, identify
production bottlenecks and take corrective action
Monitoring of hostile environments that are not accessible to man, i.e. nuclear
reactors, furnaces, etc.
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Closed Circuit
Video Out
(Coaxial cable)
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The Sony Guide to CCTV . Issue 3
Colour Video Monitor
AC outlet