Dolby AC-3

Dolby AC-3

(Dolby Audio Coding-3) The audio coding technology used in Dolby Digital. See Dolby Digital, AC-1 and AC-3.
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Horizon's professional Hz4210 High Definition single channel MPEG-2/AVC/VC1 Audio/Video decoder SoC de-multiplexes incoming off-air ATSC transport streams, extracts VBI data, timestamps, aspect ratio and other related stream parameters; filters and decodes certain user programmable channels; down-mixes 5.1 Dolby AC-3 audio into stereo audio; and performs professional HD down conversion scaling and automatic aspect ratio correction, as well as post-processing the output signal for enhanced video quality.
The coding of digital video signals using the MPEG-2 standard to produce a compressed digital video bit stream is described first, followed by the coding and compression of digital audio, including methods used by MPEG-1 and MPEG-2 standards and the Dolby AC-3 system.
With a capacity of 8.5 GB on only one side, rewritable DVD offers a playing time of more than 3 hours as well as direct digital writing and rewriting, a very-high-definition image (high-speed MPEG-2), high-fidelity sound (Dolby AC-3), and the absence of wear.
When combined with Cirrus Logic's exceptional Crystal PCI audio accelerators and driver support, the CS4294 can produce incredibly accurate 3D-positional sound and Dolby AC-3 under Microsoft's DirectSound, DirectSound3D and ActiveMovie.
The powerful surround-sound quality of Dolby AC-3, which cost $1,200 last year, is now a bargain at around $499.
In addition, the company plans to introduce a Dolby AC-3 Surround Sound system, the new five-channel audio system that is the next step up from Dolby Pro Logic, next March.
It is Dolby AC-3 compatible and meets Lucas-film THX standards.
Dow reportedly sold six Dolby AC-3 systems--which can easily run over $10,000 when combined with other components--on the first day it put them on display.
Home Theater show to unveil several new products, including a laserdisc player compatible with Dolby AC-3 Surround Sound.
"We're at 73 channels now, and the summer announcement will be it, until we go to 200 channels with dolby AC-3 audio technology with the launch of our new satellites," said Karen Muldoon, a company director.