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Glossary |
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| There are 14 entries in the glossary. | |
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| Term | Definition |
| D'Appolito | D'Appolito: Vertically symmetrical driver array. Typically consists of a tweeter mounted between two woofers. Creates a more-vertically directional sound with evenly spaced lobes in the off-axis response when compared with asymmetrical driver arrays. |
| Damping Material | Any material that absorbs sound waves and eliminates acoustic energy by converting it into a different form. Fibrous material, for example, turns acoustic energy into heat via friction. |
| DBS | Direct Broadcast Satellite. Term that replaced DSS to describe small-dish, digital satellite systems such as Starchoice and DirecTV. |
| Digital | Storing the sound oor picture as a stream of digits (0s and 1s). This method of storage is used by DVD, CD, DAT, DCC and mini-disc, for example. |
| Dipole | Speakers with drivers on opposite faces that are wired electrically out of phase, creating an area of cancellation to the sides. Recommended by THX for use as surround speakers, with null directed at the listener to create a more ambient and non-localizable effect. |
| Direct-Stream Digital | A format for encoding high-resolution audio signals. It uses a 1-bi tencoder with a sampling rate of 2,822,400 samples per second (verses 44,100 for CD). Used to encode six high-resolution channels on SACD. |
| Dispersion | The spread of sound over a wide area. |
| Distortion | Unwanted signals or changes to the signal added by Hi-Fi or Home Theater equipment or systems. The less distortion, the more "real" the sound and picture presentation |
| DLP | Digital Light Processing. A Texas Instruments process of projecting video images using a light source reflecting off of an array of tens of thousands of microscopic mirrors. Each mirror represents a pixel and reflects light toward the lens for white and away from it for black, modulating in between for various shades of gray. Three-chip versions use separate arrays for the red, green, and blue colors. Single-chip arrays use a color-filter wheel that alternates each filter color in front of the mirror array at appropriate intervals. |
| Dolby Digital (AC3) | A surround sound technique from Dolby which uses 5.1 surround sound. The 5 main channels are left, centre, right and left surround and right surround. The .1 refers to a dedicated limited bandwidth low-frequency effects channel. Gives superior separation and sound quality compared to Pro-Logic. (Dolby Digital and Pro-Logic are registered trademarks of Dolby Laboratories Inc.) See also: 5.1 surround sound |
| Dolby Pro-Logic | An earlier form of surround sound. Four separate signals are encoded in a 2-channel recording and re-separated by the processor into left, centre, right and surround channels. The surround channel is usually fed to 2 speakers at the rear. (Dolby and Pro-Logic are registered trademarks of Dolby Laboratories Inc.) See also: Dolby Surround |
| DTS (Digital Theatre Systems) | Digital Theatre Systems: Multi-channel digital surround system that encodes and decodes audio signals enhancing the fidelity of the signal to produce high quality sound. It is used in some movie theatres and is also available in some home theatre digital processors. See also: 5.1 surround sound |
| DVD | Digital Versatile Disc (previously known as Digital Video Disc).Popular video format on a CD-sized optical disc - it has very large capacity to produce movies with state of the art sound quality and picture quality approaching that of a movie theatre. One of the biggest success stories in the history of consumer electronics. |
| Dynamic Range | The range, in dB, between the largest and smallest signals reproduced by Hi-Fi. The greater the dynamic range...the more realistic the sound presentation. See also: Decibel (dB) |
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| Glossary V2.0 | |