ANSI SCTE 242-3-2017 pdf free download – Next Generation Audio Coding Constraints for Cable Systems: Part 3 – MPEG-H Audio Coding Constraints.
This document is part of a suite documenting coding constraints of Next Generation Audio (NGA)systems for cable television. In conjunction with Part 1 of this standard [1], it defines the codingconstraints on MPEG-H Audio system for cable television.
The carriage of the streams described in this specification is defined in SCTE 243-3 2017 [6] inconjunction with SCTE 243-1 2017[7].
2. Normative References
The following documents contain provisions,which, through reference in this text, constitute provisionsof this document. At the time of Subcommittee approval, the editions indicated were valid. All documentsare subject to revision; and while parties to any agreement based on this document are encouraged toinvestigate the possibility of applying the most recent editions of the documents listed below, they arereminded that newer editions of those documents might not be compatible with the referenced version.2.1.SCTE References
]SCTE242-1 2017, Next Generation Audio Coding Constraints for Cable Systems: Part 1 – Introduction and Common Constraints
2.2.Standards from Other Organizations
[2]ATSC CS A/342 Audio,Part 1: Audio Common Elements[3]ATSC CS A/342 Audio, Part 3: MPEG-H System
[4]ISOIEC 23008-3:2015: Information technology — High efficiency coding and media delivery in heterogeneous environments – Part 3: 3D audio, ISO/IEC 23008-3:2015/Amendment 2: Information technology — High efficiency coding and media delivery in heterogeneousenvironments – Part 3: 3D audio – Amendment 2,ISO/IEC 23008-3:2015/Amendment 3:Information technology — High efficiency coding and media delivery in heterogeneousenvironments – Part 3: 3D audio – Amendment 3
[5]ISO/IEC 23003-4:2015: MPEG audio technologies -Part 4: Dynamic Range Control3. Informative References
The following documents might provide valuable information to the reader but are not required whencomplying with this document.
3.1. SCTE References
[6]SCTE 243-3 2017, Next Generation Audio Carriage Constraints for Cable Systems: Part 3 – Carriage of MPEG-H Audio
[7] SCTE 243-1 2017,Next Generation Audio Carriage Constraints for Cable Systems: Part l -Common Transport Signaling
3.2. Standards from Other Organizations
[8] ATSC: “Techniques for Establishing and Maintaining Audio Loudness for Digital Television,” Doc. A/85:2013, Advanced Television Systems Committee, Washington, D.C., 12 March 2013
[9] ITU: “Algorithms to measure audio programme loudness and true-peak audio level,”Recommendation ITU-R BS.1770-4, International Telecommunications Union, Geneva, Switzerland, 2015
6. MPEG-H Audio Coding Constraints
6.1. Introduction
The MPEG-H Audio system offers methods for coding of channel-based content, coding of object-based content, and coding of scene-based content (using Higher Order Ambisonics [HOA] as a sound-field representation). An MPEG-H Audio encoded program may consist of a flexible combination of any of the audio program elements that are defined in Part1 of this standard, subclause 6.2.2 [1], namely:
• Channels (i.e., signals for specific loudspeaker positions),
• Objects (i.e., signals with position information) and
• Higher Order Ambisonics, HOA (i.e., sound field signals).
The MPEG-H Audio system is a Next Generation Audio (NGA) system standardized in ATSC 3.0. A complete overview of the MPEG-H Audio system and its main features is given in ATSC A/342-3 Clause 4 [3] and ATSC A/342-1 Clause 5 [2].
6.1.1. Profiles and Levels
Table 1 is provided here for information and it shows which are the limitations of each Level of the Low Complexity Profile and also examples of configurations supporting the maximum values for each level.
6.2. Encoding Constraints
Bitstreams produced by the encoder shall comply with the MPEG-H Audio Low Complexity (LC) Profile as defined in ISO/IEC 23008-3 Clause 4 [4]. The encoder shall use MPEG-H Audio LC Profile Level 1,Level 2 or Level 3.
All constraints specified in Part 1 of this standard, Clause 7 [1] shall apply.ANSI SCTE 242-3 pdf download.