Video and Audio Surveillance Technology Flashcards
7 cards from real CST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Video and Audio Surveillance Technology flashcards as text
What is the minimum illumination specification on a camera datasheet used to determine?
Answer: The lowest light level at which the camera can produce a usable image
Minimum illumination (measured in lux) specifies the lowest light level at which a camera can produce a usable image, helping determine if additional lighting or IR illumination is needed.
A PTZ camera is programmed with 'preset positions.' What does this feature allow?
Answer: Store specific camera angles that can be recalled instantly via commands or automation
PTZ preset positions store specific pan, tilt, and zoom configurations that can be instantly recalled through operator commands, automation triggers, or tour sequences.
What is the function of a 'privacy mask' in a surveillance camera system?
Answer: Block specific areas of the camera's field of view from being recorded or displayed
Privacy masks are configurable areas within a camera's field of view that are blocked out (blacked out or blurred) in both live view and recordings, protecting sensitive areas like restrooms or neighboring properties.
In a coaxial cable surveillance installation, what is the primary purpose of a BNC connector?
Answer: Maintain the 75-ohm impedance match required for video signal transmission
BNC (Bayonet Neill-Concelman) connectors maintain the 75-ohm impedance of coaxial cables, ensuring proper video signal transmission without reflections or signal degradation.
What surveillance technology uses unique patterns in the iris of the eye for identification purposes?
Answer: Iris recognition biometrics
Iris recognition biometrics capture and analyze the unique, complex patterns in the colored part of the eye (iris) to identify individuals with very high accuracy.
Which recording mode conserves storage by only recording when motion is detected?
Answer: Motion-triggered recording
Motion-triggered (or motion-activated) recording conserves storage space by only recording footage when motion is detected in the camera's field of view.
What is the purpose of 'pre-alarm recording' (pre-buffering) in a surveillance NVR?
Answer: Record footage before an alarm event by continuously buffering video in memory
Pre-alarm recording (pre-buffering) continuously stores a short buffer of video in memory so that when an alarm triggers, the recording includes footage from before the triggering event.