CST Video and Audio Surveillance Technology 3

Question 1

What is the key difference between a DVR and an NVR in surveillance systems?

Accepted Answer

DVRs process analog camera signals while NVRs record from IP cameras over a network

Answer

A DVR (Digital Video Recorder) processes and records analog camera signals, while an NVR (Network Video Recorder) receives and stores pre-encoded digital streams from IP cameras over a network.

Question 2

Which video compression codec offers approximately 50% better compression efficiency than H.264 at the same video quality?

Accepted Answer

H.265 (HEVC)

Answer

H.265 (HEVC) provides approximately 50% better compression efficiency than H.264, significantly reducing storage and bandwidth requirements while maintaining the same video quality.

Question 3

A CST is designing an outdoor surveillance system that must operate in temperatures ranging from -40°F to 140°F. Which camera specification addresses this requirement?

Accepted Answer

Operating temperature range

Answer

The operating temperature range specification indicates the environmental temperatures within which a camera is designed to function reliably.

Question 4

What does a camera's signal-to-noise ratio (SNR) indicate about its performance?

Accepted Answer

The balance between useful video signal and unwanted electronic noise, with higher values indicating cleaner images

Answer

Signal-to-noise ratio (SNR) measures the ratio of useful video signal to electronic noise; a higher SNR (e.g., 50dB vs. 40dB) indicates a cleaner, less grainy image, especially in low-light conditions.

Question 5

In audio surveillance, what is the legal requirement in most US two-party consent states regarding covert audio recording?

Accepted Answer

All parties to a conversation must be notified and consent to being recorded

Answer

In US two-party (all-party) consent states, all parties to a private conversation must consent to being recorded, making covert audio surveillance potentially illegal without all parties' knowledge.

(CST) Certified Surveillance Technician Practice Test

(CST) Certified Surveillance Technician Practice Test

CST Video and Audio Surveillance Technology 3