Akai A 5181 Service Manual

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Akai A 5181 Service Manual

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Terminology & Abbreviations Dolby Digital A perceptual coding system for audio, developed by Dolby Laboratories and accepted as an international standard. Dol by Digital is the most common means of encoding audio for DVD-Video and is the mandatory audio compression system for 525/60 (NTSC) discs. Dolby Surround The standard for matrix en coding surround-sound channels in a stereo signal by applying a set of defined mathem atical functions when combining center and surround channels with left and right channels. The center and surround channels can then be extracted by a decoder such as a Dolby Pro Logic circuit which applies the inverse of the mathematical func tions. A Dolby Surround decoder extracts surround channels, while a Dolby Pro Logic de coder uses tially independent of the recording or transmission format. Both Dolby Digital and MPEG audio compression systems are compatible with Dolby Surround audio. 1-1 DTS Digital Theater Sound. A perceptual audi o-coding system developed for theaters. A competitor to Dolby Digital and an optional audio track format for DVD-Video. DVCD Stands for Double Video CD -- pretty popular format in mainland China. Format itself is nothing new really, its just a regular VideoCD overburned to include 90 to 99mins per CD, compared to regular 74mi ns per CD in standard VideoCD format. DVD An acronym that officially stands for nothing, but is often expa nded as Digital Video Disc or Digital Versatile Disc. The audio/ video/data storage system based on 12-and 8-cm optical discs. 1-1 DVD+R DVD+Recordable defines a standard for recordable DVD drives and media defined by the DVDRW Alliance. Often called "plus R" , the format is write once (compared to DVD+RW wich can be erased and rewrit ten). The single sided discs can hold 4,700,000,000 bytes (4.38 Gigabytes at 1024 bytes to the kilobyte) with double sided discs holding twice as much. There are no dual layer single sided record able discs. This format competes with the DVD Forum DVD-R specification. DVDRhelp DVDR information JPEG Joint Photographic Experts Group. The international committee which created its namesake standard for compressing still images. Karaoke Literally empty orchestra. The social sensation from Japan where sufficiently inebriated people embarrass themselves in public by singing along to a music track. Karaoke was largely responsible for the succe ss of laserdisc in Japan, thus supporting it elsewhere. Kodak Picture CD Kodak Picture CD is a CD that contains your pictures in JPEG format(.jpg) along with software that lets you view, enhance, share, and print your pictures from your computer. Some standalone DVD Player s supports this format also, but then only for viewing. This format will also work on DVD Players that supports "JPEG file viewing" but you may lose some Kodak Picture CD specific features. Kodak Picture CD. Macrovision An antitaping process that modifi es a signal so that it appears unchanged on most televisions but is distorted and unwatch able when played back from a videotape recording. Macrovision takes advantage of ch aracteristics of AGC circuits and burst decoder circuits in VCRs to interfere with the recording process. 1-2