
Glossary
Glossary
Complex terms used in this book, or terms not explained in the body of the text, will be briefly explained here. For further explanation, please consult commercially available reference texts.
5BNC | A type of connector used to input analog video |
| signals. |
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Aspect ratio | The ratio between an image’s length and its height. |
| Images which have an aspect ratio of 16:9 are called |
| Widescreen. The aspect ratio for standard images is |
| 4:3. |
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Color | The temperature of an object which is emitting light. |
Temperature | When the color temperature is high, colors tend to |
| take on a bluish tinge; when the color temperature is |
| low, colors tend to take on a reddish tinge. |
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Component Video | A type of video signal which has the video |
| brightness and color signal information separated, in |
| order to provide better image quality. In high- |
| definition TV (HDTV), it refers to images which |
| consist of three independent signals: Y (luminance |
| signal), and Pb and Pr (color difference signals). |
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Composite Video | The standard home video signal (NTSC, PAL, |
| SECAM) which has the video brightness and color |
| signal information mixed together. Composite video |
| consists of the carrier signal Y (luminance signal) |
| and the chroma (color) signal, combined within the |
| color bar signal. |
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Contrast | The relative brightness of the light and dark areas of |
| an image, which can be increased or decreased in |
| order to make text and graphics stand out, or appear |
| softer. |
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The process used to cool down a projector lamp that | |
| is hot from use. |
| when the [Power] button is pressed on the projector |
| or on the remote control to turn the projector off. Do |
| not unplug the projector power cable while it is |
| cooling down. If |
| the lamp gets trapped inside the projector, |
| potentially shortening the life of the lamp and |
| causing projector failure. |
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Dolby | An audio format developed by Dolby Laboratories. |
digital | Normal stereo is a |
| speakers, whereas Dolby Digital is a |
| channel) system which adds a center speaker, two |
| rear speakers and a |
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HDTV | An abbreviation for |
| refers to high definition systems which satisfy the |
| following conditions: |
| • Vertical resolution of 750p or 1125i or greater |
| |
| • Screen aspect ratio of 16:9 |
| • Dolby digitalgl audio reception and playback (or |
| output) |
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Interlaced | Each screen is divided into fine horizontal lines |
scanning | which are displayed in sequence starting from left to |
| right and then from top to bottom. In this method of |
| image scanning, even numbered lines and odd |
| numbered lines are displayed alternately. |
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Progressive | A method of image scanning whereby the image |
scanning | data from a single image is scanned sequentially |
| from top to bottom to create a single image. |
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