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| There are 9 entries in the glossary. | |
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| Term | Definition |
| Absorption | Reduction of acoustical energy usually by |
| AC:3 | Audio Codec 3. This was the original and more technical name for Dolby Digital. Replaced by marketing mavens when they realized that Dolby's name was not in the title. Some RF modulated, 5.1-encoded laser discs were labeled as AC3. Later versions were labeled as Dolby Digital.This home cinema sound system uses 5 separate channels (front left, front centre, front right, left surround and right surround) and one subwoofer. This is known as a 5.1 surround system, (5 speakers, and 1 subwoofer). See also: Dolby Digital (AC3) |
| Academy Curve | An intentional roll-off in a theatrical system's playback response above ~2kHz (to -18dB at 8kHz) to minimize noise in mono optical tracks. Some many) transfers to home video of mono movies have neglected to add the Academy filter during transfer, giving many old movies a screechy sound they were never intended to have. A few home processors have an option for this, making them a must for old-movie buffs. Has been used since 1938.
(many) transfers to home video of mono movies have neglected to add the Academy filter during transfer, giving many old movies a screechy sound they were never intended to have. |
| Acoustically Voice/tone Matched | Ensuring that the many different loudspeakers used in a Home Cinema system have a sufficiently similar tonal, or timbre match, such that when a sound is panned between them there is no change in character of the sound. |
| Active:Powered | Powered. An active cross-over is electrically powered and divides the line-level signal prior to amplification. An active speaker includes an active crossover and built-in amplifier. |
| Amplifier | Electronic system used to boost, or increase signals to drive loudspeakers. It can be a single box or separated into two components - pre-amp and power-amp. |
| Analogue | An electrical signal analogous to the original sounds in non-digital form For example LPs and cassette tapes store audio in an analogue form. |
| Anamorphic | Process that horizontally condenses (squeezes) a 16:9 image into a 4:3 space, preserving 25 percent more vertical resolution than letterboxing into the 4:3 space. For the signal to appear with correct geometry, the display must either horizontally expand or vertically squish the image. Used on about two or three promotional laser discs and many DVDs. Also called Enhanced for Widescreen or Enhanced for 16:9 |
| Aspect Ratio | The ratio of image width to image height. Common motion-picture ratios are 1.85:1 and 2.35:1. Television screens are usually 1.33:1 (also known as 4:3), which is similar to the Academy standard for films in the '50s. HDTV is 1.78:1, or 16:9. When widescreen movies (films with aspect ratios wider than 1.33:1) are displayed on 1.33:1 televisions, the image must be letterboxed, anamorphically squeezed, or panned-and-scanned to fit the screen. |
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| Glossary V2.0 | |