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Dolby AC-4 can have up to 5.1 core audio channels which all Dolby AC-4 decoders are required to decode. [1] Additional audio channels may be encoded as side signals which Dolby AC-4 decoders can optionally support which would allow for the delivery of 7.1.4 channel audio. [1] Side signals may also contain audio objects. [1]
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 service No No No Yes ? ALAC: Apple Inc. 2004-04-28 QuickTime 7.6 Free QuickTime, iTunes, RealPlayer
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 standards: G.719; G.722. FFmpeg; G.722.1 (subset of Siren7) and G.722.1 Annex C ...
On May 4, 2016, the Audio Codec component of ATSC 3.0 was elevated to candidate standard, with two finalists remaining: Dolby AC-4 [2] and MPEG-H Audio Alliance format from Fraunhofer IIS, Qualcomm and Technicolor SA. [3] A third entry from DTS named DTS:X (a successor to DTS-HD) was withdrawn before the standard was upgraded to candidate ...
Dolby AC-4 is a lossy audio compression format that can contain audio channels and/or audio objects. Dolby Atmos is a suite of technologies for immersive audio having both horizontal and vertical sound placement, using a combination of channel and object-based mixing and delivery. It was first introduced in cinemas with Brave (2012 film).
The MPEG-H Audio Alliance TV audio system and Dolby AC-4 are part of the A/342 standard. [ 12 ] On June 24, 2016, the South Korean standardization organization "Telecommunications Technology Association" TTA published the standard for "Transmission and Reception of Terrestrial UHD TV Broadcasting Service" for the South Korean terrestrial UHD TV ...
A lossless audio coding format reduces the total data needed to represent a sound but can be de-coded to its original, uncompressed form. A lossy audio coding format additionally reduces the bit resolution of the sound on top of compression, which results in far less data at the cost of irretrievably lost information.
Dolby Digital Plus (E-AC3) performs Spectral Extension (SPX). SPX reduces high-frequency components to metadata and is similar to E-AC3 multichannel coupling calculation. [7] Dolby AC-4 expands the technique to Advanced Spectral Extension (A-SPX), with the option of interleaving with regular, non-extended data in time or frequency domain. As a ...