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45 Cards in this Set
- Front
- Back
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PLUGE |
Picture Lineup Generation Equipment. Equipment used to generate greyscale test patterns for calibrating the black level and contrast. |
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SMPTE |
Society of Motion Picture and television engineers. Society that standardized colour bars. |
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Waveform monitor |
A special type of oscilloscope that is used to measure the intensity of a video signal. Usually corresponding to brightness. |
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Black Level on a Waveform Monitor |
7.5 IRE |
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Sync Pulse in IRE |
-40 IRE |
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White level on a waveform monitor. |
100 IRE |
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Colour burst level on a waveform monitor (in IRE) |
0 IRE |
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Vectorscope display is based on what? |
Maxwell's triangle. |
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The colour burst must be at which degree on the vectorscope? |
0 degree line. |
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Where does the word "bit" come from? |
Binary Digit. |
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To calibrate a vectorscope what needs to be lined up? |
Line up the points of the colours in the targets. |
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What base do we usually count in? |
Base 10. |
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What base is binary in? |
Base 2. |
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What is 57 in 8 bit binary? |
001110001 |
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How many numbers in an 8 bit system? |
256 |
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How many numbers in a 10 bit system? |
1024 |
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What does LCD stand for? |
Liquid Crystal Display. |
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What's the difference between LCD and LED displays? |
Both LCD and LED use liquid crystal technology. LCD has a fluorescent backlight, while LED have LED backlights. |
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What is a sub-pixel? |
Every pixel is made up of a red, green, and blue sub-pixel. These are turned on and off to make different colours. |
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How do plasma displays work? |
Gas is charged. Plasma is created from the gas. UV rays are released. When the UV rays hit the phosphors they glow. |
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Describe sample rate vs quantization |
Sample rate is how often, quantization is how much. |
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What is Nyquist Rate |
The lowest sampling rate at which audio can be accurately reproduced. |
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A to D and D to A |
Analogue to digital and digital to analogue conversion. |
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What are some common colour sampling rates? |
4:4:4, 4:2:2, 4:2:0, 4:1:1 4:4:4 Four pixels across, four pixels used for chrominence, four pixels across the bottom |
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Spatial Redundancy |
Eliminate redundancy by assuming similar coloured pixels are the same colour. |
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Temporal Redundancy |
Eliminate redundancies by recording pixels that move between frames. |
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Normaled, half normaled, not normaled |
Normaled: Internally connected. Can be broken by inserting jack in to input or output. Half normaled: Same as normaled but can only be broken by inserting jack in to input. Not normaled: Nothing connected. |
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How many bits in a byte? |
8 bits in a byte. |
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What does JPEG stand for? |
Joint Photographic Experts Group |
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What does MPEG stand for? |
Motion Pictures Expert Group |
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What does ATSC stand for? |
Advanced Television Standards Committee. |
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What does NTSC stand for? |
National Television Standards Committee. |
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Types of coded frames in video compression? |
I-frame: Complete recorded frame. P-frame: Predicatively coded frame. Coded based on previous frame. B-frame: Bi-directionally predicted frame. Coded based on previous and future I-frames. |
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What does GOP stand for? |
Group of pictures. |
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How many frames are in a MPEG GOP? |
15 |
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Define patching |
Manually connecting two or more circuits. |
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Patching conventions for inputs and outputs |
Outputs on the top and inputs on the bottom |
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What kind of patch cords are used for audio patching? |
1/4 inch TRS |
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What kind of patch cords are used for professional video patching? |
Cooke Jack |
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What is a distribution amplifier? |
Single input, multiple outputs, either audio or video. Each output is identical to input. Outputs could be on a patch field or hardwired in to equipment. |
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What are the two types of switchers? |
Active and passive. |
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What is an active switcher? |
Switch should occur without causing disturbance to the picture. Switch only occurs during a vertical scan. |
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What is a passive switcher? |
Not powered. Switched when asked, not during vertical scan interval. Usually used for offline monitoring. |
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3 types of active switchers? |
Routing switcher, production switcher, and master control switcher |
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Maximum compression ratio for lossless? |
3:1 |
