CBT CBT Studio Production Technology 1 — Questions and Answers
Question 1: What does a routing switcher (router) do in a broadcast facility?
- Switches between on-air program sources during live production
- Connects any input source to any output destination under software control (Correct answer)
- Routes IP network traffic between broadcast devices
- Switches between primary and backup transmitters
Correct answer: Connects any input source to any output destination under software control
A routing switcher allows any input signal (video, audio, or data) to be connected to any output destination, providing flexible signal distribution throughout the facility.
Question 2: What is the purpose of a house sync (black burst or tri-level sync) signal in a broadcast facility?
- Provides a color reference for color correction monitors
- Synchronizes all video equipment to a common timing reference (Correct answer)
- Acts as a backup black signal for unused inputs
- Provides genlock for satellite receivers
Correct answer: Synchronizes all video equipment to a common timing reference
House sync provides a facility-wide timing reference so all video equipment operates at exactly the same frequency and phase, preventing frame tears during switching.
Question 3: What is a frame synchronizer used for in broadcast?
- To correct lip sync errors in live productions
- To synchronize an asynchronous incoming signal to the facility's house sync (Correct answer)
- To convert between interlaced and progressive scan formats
- To buffer video for time-delay broadcast compliance purposes
Correct answer: To synchronize an asynchronous incoming signal to the facility's house sync
A frame synchronizer captures an incoming video signal and re-clocks it to match the local house sync, allowing asynchronous signals (like satellite feeds) to be cleanly integrated.
Question 4: What does SMPTE timecode provide in broadcast production?
- A quality control identifier embedded in the video signal
- An absolute time address (hours:minutes:seconds:frames) for every video frame (Correct answer)
- A synchronization reference for audio sample clocks
- A watermark to identify broadcast content origin
Correct answer: An absolute time address (hours:minutes:seconds:frames) for every video frame
SMPTE timecode assigns a unique hours:minutes:seconds:frames address to every video frame, enabling precise editing, logging, and synchronization of production elements.
Question 5: What is the difference between drop-frame and non-drop-frame SMPTE timecode?
- Drop-frame skips certain frame numbers to keep timecode aligned with real clock time at 29.97 fps (Correct answer)
- Drop-frame physically removes frames from the video to reduce file size
- Non-drop-frame is used only for film at 24 fps
- Drop-frame is used for live broadcasts only, non-drop for editing
Correct answer: Drop-frame skips certain frame numbers to keep timecode aligned with real clock time at 29.97 fps
Drop-frame timecode compensates for the 29.97 fps rate (not exactly 30 fps) by skipping frame numbers 00 and 01 at the start of each minute, except every 10th minute, keeping timecode aligned with wall clock time.
Question 6: In a broadcast facility, what is a production switcher (vision mixer) primarily used for?
- Distributing signals to multiple destinations simultaneously
- Selecting and transitioning between sources for on-air program output (Correct answer)
- Converting analog sources to digital for routing
- Monitoring all facility signals simultaneously
Correct answer: Selecting and transitioning between sources for on-air program output
A production switcher allows the technical director to select video sources, apply transitions (cuts, dissolves, wipes), and create composites (chroma key, DVEs) for the on-air program.
CBT CBT Studio Production Technology 1
What does a routing switcher (router) do in a broadcast facility?