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AC-4 uses an improved modified discrete cosine transform (MDCT) audio coding algorithm. [6] Dolby states that Dolby AC-4 provides a 50% reduction in bit rate over Dolby Digital Plus. [1] When Dolby AC-4 was tested by the DVB the Multiple Stimuli with Hidden Reference and Anchor test (MUSHRA) score was 90 at 192 kbit/s for 5.1 channel audio. [1]
The AC-3 format was released as the Dolby Digital standard in February 1991. [4] [5] Dolby Digital was the earliest MDCT-based audio compression standard released, and was followed by others for home and portable usage, such as Sony's ATRAC (1992), the MP3 standard (1993) and AAC (1997). [6]
Theatrical movie presentation, Digital TV service & home-video (personal recorders, DVD, etc.) No No No No ? AC-4: Dolby Laboratories: 2014 ATSC A342:2022-03 Non-free Digital television, Harmonic Inc., DS Broadcast, Ateme, Synamedia, Dolby Media Encoder & Dolby Encoding Engine ExoPlayer (decoding only for supported mobile devices) Digital TV ...
Dolby Digital Plus, also known as Enhanced AC-3 (and commonly abbreviated as DDP, DD+, E-AC-3 or EC-3), is a digital audio compression scheme developed by Dolby Labs for the transport and storage of multi-channel digital audio.
Dolby Digital Plus (also known as E-AC-3) is a lossy audio codec based on Dolby Digital that is backward compatible, but more advanced. The DVD Forum has selected Dolby Digital Plus as a standard audio format for HD DVD video. It supports data rates up to 6 Mbit/s, an increase from Dolby Digital's 640 kbit/s maximum. On Blu-ray, Dolby Digital ...
Dolby Digital (AC3, ATSC A/52, ETSI TS 102 366) FFmpeg; liba52 (decoder only) Dolby Digital Plus (E-AC-3, ATSC A/52:2012 Annex E, ETSI TS 102 366 Annex E) FFmpeg; DTS Coherent Acoustics (DTS, Digital Theatre System Coherent Acoustics, ETSI TS 102 114) FFmpeg; libdca (decoder only) Dolby AC-4 (ETSI TS 103 190) Impala Blackbird audio codec; ITU ...
Dolby TrueHD is a lossless, multi-channel audio codec developed by Dolby Laboratories for home video, used principally in Blu-ray Disc and compatible hardware. Dolby TrueHD, along with Dolby Digital Plus (E-AC-3) and Dolby AC-4, is one of the intended successors to the Dolby Digital (AC-3) lossy surround format.
Dolby AC-4, Dolby Digital audio codec; Videogames. Ace Combat 04: Shattered Skies, a 2001 video game; Armored Core 4, a 2006 video game;