Glossary Of Terms S - Z - CCTV
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Glossary of CCTV Terms: S - Z
This glossary highlights key terms related to CCTV from S to Z, providing clear definitions to enhance your understanding of this technical field.
Key Terms
S/N Ratio
The Signal-to-Noise ratio measures the quality of a signal by comparing its level to background noise using a logarithmic scale.Scene Illumination
Represents the average light level in a monitored area, measured in lux. The human eye cannot perceive illumination below 10-2 lux.Silicon
The basic material used in creating modern semiconductor devices.Simplex
A communication system capable of transmitting data in one direction only. In CCTV, it refers to multiplexer operations where either recording or playback occurs individually.Skin Effect
Describes how alternating current tends to flow only on the surface of a conductor as frequency increases.Slow Scan
This involves transmitting a series of static images via analog or digital signals over limited bandwidth media, often using telephone lines.Smear
An unwanted effect in CCD chips, leading to vertical bright stripes in images due to bright areas. Top-quality cameras minimize this effect.SMPTE
The Society of Motion Picture and Television Engineers, involved in setting standards in the film and television industry.Spectrum
In electromagnetics, this describes a signal's amplitude across its frequency components. In optics, it refers to the range of light frequencies seen as a rainbow.SPG
Sync Pulse Generator ?" a device generating synchronization pulses.Additional Terms
- Split Screen Unit: Also known as a quad compressor, this device displays multiple images on a single monitor simultaneously.
- S-VHS: Super VHS, a video recording format by JVC offering improved resolution and compatibility with VHS.
- TBC: Time Base Correction for synchronizing signals in devices like multiplexers.
- TDG: Time and Date Generator used for timestamping video content.
- Telemetry: Remote control system for managing camera functions such as pan, tilt, zoom, and focus through digital encoding.
- Termination: Involves connecting cables with specific connectors, ensuring proper impedance matching for high-frequency signals.
- Time Lapse VCR: A VHS format video recorder extending recording duration significantly by controlling tape movement in discrete steps.
- Time Lapse Video Recording: Intermittent video signal recording to extend the medium's recording duration.
- Time Multiplexing: Recording multiple camera feeds on one VCR by sequencing images with a timed interval.
- UHF Signal: Ultra High Frequency signals, defined between 470 MHz and 850 MHz in television.
- UPS: Uninterruptible Power Supply, crucial for security systems, providing backup power during outages.
- VDA: Video Distribution Amplifier, gives multiple outputs from a single video signal without interference.
- Vertical Shift Register: A mechanism in CCD technology for reading charges from photo sensors.
- VHF: Very High Frequency, with television bands ranging from 45 MHz to 215 MHz.
- VHS: Video Home System, a common video recording format with limitations in resolution for CCTV.
- Video Equalisation Corrector: Corrects unequal frequency losses in video transmission.
- Video Matrix Switcher: Switches between multiple video sources and outputs, more powerful than standard video switchers.
- Video Monitor: Converts video signals into images for display.
- Video Printer: Outputs a video signal to a physical print, available in monochrome or color.
- Video Signal: An electrical signal with all image elements from a camera or video source.
- Video Switcher: Allows manual or automatic switching of camera feeds to monitors.
- VITS: Video Insertion Test Signals, special signals used to check reception quality.
- VLF: Very Low Frequency, ranging from 10 to 30 kHz.
This glossary provides a comprehensive understanding of CCTV-related terms, enhancing your ability to work with security systems effectively.
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