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AC-3 Compressed Audio (Dolby Digital), Revision A
https://www.loc.gov/preservation/digital/formats/fdd/fdd000209.shtml#:~:text=Identification%20and%20description%20%20%20Full%20name%20,%28published%20a%20...%20%204%20more%20rows%20
What is AC-3 (Dolby Digital)? - Definition from WhatIs.com
https://whatis.techtarget.com/definition/AC-3-Dolby-Digital
AC-3, also known as Dolby Digital , is a perceptual digital audio coding technique that reduces the amount of data needed to produce high-quality sound. Perceptual digital audio coding takes advantage of the fact that the human ear screens out a certain amount of sound that is perceived as noise.
AC-3 Compressed Audio (Dolby Digital), Revision A
https://www.loc.gov/preservation/digital/formats/fdd/fdd000209.shtml
Digital Audio Compression (AC-3), Revision A (ATSC Doc. A/52A) (formal name); AC-3 and Dolby Digital (common names) Description: Lossy format designed for the efficient encoding of surround sound, developed to support motion picture presentations in theaters and at …
Dolby® AC3 Technology | Rohde & Schwarz
https://www.rohde-schwarz.com/us/technologies/video-audio-standards/dolby-ac3/dolby-ac3-technology/dolby-ac3-technology_55831.html
Dolby® AC-3 Technology Dolby® Digital (AC-3) Dolby® digital is a digital audio system requiring a license that has been developed by Dolby® Laboratories for movie theaters and home movie systems. Dolby® digital supports mono channels, stereo channels or up to five separate main channels plus one low-frequency channel.
ATSC 3.0 Dolby Audio Handbook
https://professional.dolby.com/siteassets/tv/home/dolby-vision/dolby_atsc3_hdbk_digi_v04_share.pdf
AC-4 provides significant compression efficiency improvement over AC-3. For example, AC-3 is commonly used at a data rate of 384 kbps for delivering a 5.1-ch mix. With AC-4, broadcasters are able to use a data rate of 128 kbps to deliver the same 5.1-channel audio with the same quality. In order to provide margin for operations that might require
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