Ccd

Glossary

Cable Compensated Amplifier

High frequency video signals are attenuated when transmitted through cables. A cable compensated amplifier boosts the high fre- quency signals depending upon the cable distance. This ensures minimum video loss.

Cable Core

Is the central part of the cable which actually carries the video, con- trol or power signals. It can be made up of a single conductor (solid core) or a number of electrical wires.

Cable Jacket

Is the outer protective coating which covers the core of the cable.

Cable Tray

Is a long tray installed in many sites which allows cables to be eco- nomically laid out.

Camera

Is an electronic device which converts light into an electrical signal.

Camera Controller

Controls the different functions of a pan & tilt head and the zoom lens. It is also known as the PTZ controller.

Candela

Is a new unit which replaces the candle and is a measurement of luminous intensity.

Cathode Ray Tube (CRT)

Is a tube in the monitor containing a heated cathode which emits a beam of electrons focused on a phosphor coated surface. The sur- face glows depending upon the intensity of the beam. The deflection circuitry in the tube controls the movement of the beam.

Charge Coupled Device is a solid state device in a camera that con- verts light falling on it into an electrical signal.

CCD Iris

Is a feature in modern CCD cameras by which the iris function is per- formed by the CCD chip itself. This eliminates the need for an auto iris lens. The CCD iris can handle minor light fluctuations only and therefore is not recommended for most outdoor applications.

CCIR

International Radio Consultative Committee recommends a format of 625 lines per frame and a transmission speed of 25 frames per second.

CCTV

Closed circuit television

Channel Separation

When signals are multiplexed at different frequencies for transmis- sion, then the separation between these frequencies is called chan- nel separation. Poor separation can lead to cross talk.

Chassis

Is used as a carrier for a certain number of slide-in modules. A power supply in the chassis ensures power for the modules. The CCTV chas- sis fit the industry 19” standard.

Chromatic Aberration

Is an error in lenses which causes the focal point to be scattered. This occurs because different wavelengths of light bend differently through a lens. A combination of lenses are required to minimise this error.

Chrominance Signal

Is that part of the video signal which contains the colour information. In S-VHS, this signal is transmitted along a separate cable. In a com- posite video signal, the chrominance signal is multiplexed at a higher frequency and sent along the same cable.

Colour Stripe Filter

This type of filter is placed in front of a colour CCD chip. It breaks up light into the basic colours - red, green and blue which are then directed to separate pixels in the CCD chip.

Common Sync

Is a device used to synchronise cameras. It generates synchronizing pulses that are sent to all cameras connected to it by coaxial cable.

Generator

Composite video is a standard signal format in CCTV which contains the video signal, the horizontal and vertical sync pulses and the blanking pulses.

Concave

Is a type of optical lens in which the light rays passing through it are made to diverge by the inward bulge of the glass surface.

Conduit

Is a plastic or metallic tube which is used to conceal, protect or secure cables.

Connector

Is a device used to interconnect cables or connect cables to various equipment.

Contrast

Is the difference in the intensity between the black parts and white parts of the picture on the monitor.

Contrast Control

Is a control in the monitor which changes the contrast by increasing or decreasing the amplitude of the video signal.

Covert

Is a mode of CCTV surveillance in which the camera and lens are hid- den and cannot be seen.

Convex

Is a type of optical lens in which the light rays passing through it are made to converge by the outward bulge of the glass surface.

16-3	© Siemens Building Technologies Group

CRT, TFT specifications

Siemens, a prominent name in electronics and engineering, has made significant contributions to display technology, particularly in the realms of Thin Film Transistor (TFT) and Cathode Ray Tube (CRT) displays. These technologies have paved the way for advancements in visual media, ranging from television sets to computer monitors.

TFT display technology, a type of LCD (Liquid Crystal Display), employs thin film transistors to produce brighter and more vibrant images. One of the main features of TFT displays is their ability to deliver high resolution and excellent color reproduction, making them ideal for various applications such as smartphones, tablets, and laptops. TFT screens utilize an active matrix approach, which allows each pixel to be controlled individually. This method results in faster response times and improved image quality, with less motion blur, compared to older passive matrix displays.

One of the key characteristics of TFT technology is its versatility in different settings. It supports a wide range of viewing angles, which enhances the user experience whether one is viewing the display head-on or at an angle. Additionally, TFT displays are known for their thin profile and lightweight design, contributing to the overall portability of devices that incorporate them.

On the other hand, CRT technology, which was once the standard for televisions and computer monitors, uses electron beams and phosphorescent screens to produce images. One of the defining features of CRTs is their ability to display deep blacks and a wide color gamut. CRT technology can achieve high refresh rates, reducing flicker and improving the quality of fast-paced visuals. However, CRTs tend to be bulkier and heavier than modern display technologies like TFT.

Despite the evolution towards flat-panel displays, CRT technology is still appreciated for its natural color and motion portrayal. Siemens has leveraged these characteristics to produce quality CRT monitors that were favored in professional settings, including graphic design and medical imaging, where color accuracy is paramount.

In summary, Siemens has played a vital role in advancing both TFT and CRT technologies. TFT displays are recognized for their high resolution, fast response times, and design versatility, while CRTs are celebrated for their rich color and depth. As technology continues to advance, the legacy of these display types remains influential in shaping modern electronic devices.

Siemens CRT, TFT manual Ccd

Models: CRT TFT