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 colour temperature is high, colours tend to |
| take on a bluish tinge; when the colour temperature |
| is low, colours tend to take on a reddish tinge. |
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Component | A type of video signal which has the video |
Video | brightness and colour 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 (colour difference signals). |
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Composite Video | The standard home video signal (NTSC, PAL, |
| SECAM) which has the video brightness and colour |
| signal information mixed together. Composite video |
| consists of the carrier signal Y (luminance signal) |
| and the chroma (colour) signal, combined within the |
| colour bar signal. |
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Contrast | The relative brightness of the light and dark areas of |
| an image can be increased or decreased in order to |
| make text and graphics stand out, or appear softer. |
| Adjusting this particular property of an image is |
| called "contrast adjustment". |
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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 whilst 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 centre 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 | ||
| (p=Progressive scanningg, i=Interlaced scanningg) | ||
| • 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. This method of | ||
| image scanning, whereby even numbered lines and | ||
| odd numbered lines are displayed alternately, is | ||
| called Interlaced scanning. | ||
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Progressive | A method of image scanning whereby the image data | ||
scanning | from a single image is scanned sequentially from top | ||
| to bottom to create a single image. | ||
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