ANSI SCTE 242-4-2018 pdf free download – Next Generation Audio Coding Constraints for Cable Systems: Part 4 – DTS-UHD Audio Coding Constraints.
1.1. Scope
This document is part four of a multi-part standard that specifies the coding constraints of Next
Generation Audio system for cable television. In conjunction with SCTE242-1 [1], this document definesthe coding constraints on DTS-UHD for cable television. The carriage of the streams described in thisspecification is defined in SCTE 243-4 [8 ] in conjunction with SCTE 243-1[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 to
investigate 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
[1] ANSISCTE 242-12017, Next Generation Audio Coding Constraints for Cable Systems: Part 1 –
Introduction and Common Constraints
2.2. Standards from Other Organizations
[2]ATSC Standard A/342-1:2017,A/342 Part 1,Audio Common Elements
[3]ETSI TS 103 491 V1.1.1(2017-04),DTS-UHD Audio Format; Delivery of Channels, Objects and Ambisonic Sound Fields
[4] Recommendation ITU-R BS.1770-4(2015-10),Algorithms to measure audio programme loudness and true-peak audio level
[5]DVB BlueBook A038(2017-12),Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems (Final draft of ETSI EN 300 468 v 1.16.1)
[6]ISO/IEC 639-2:1998,”Codes for the representation of names of languages – Part 2: Alpha-3 code”
2.3. Published Materials
.No normative references are applicable.3. Informative References
The following documents might provide valuable information to the reader but are not required whencomplying with this document.
3.1. SCTE References
[7]ANSI/SCTE243-1 2017, Next Generation Audio Carriage Constraints for Cable Systems: Part 1 – Common Transport Signaling
[8]SCTE 243-4 2018, Next Generation Audio Carriage Constraints for Cable Systems: Part 4- DTS-UHD Audio Carriage Constraints
3.2. Standards from Other Organizations
[9] ETSI TS 103 584 V1.1.1 (2018-01), DTS-UHD Point Source Renderer
[10] ATSC Doc A/85:2013, Techniques for Establishing and Maintaining Audio Loudness for
Digital Television
3.3. Published Materials
• No informative references are applicable.
6. DTS-UHD System Description The DTS-UHD coding system is the third generation of DTS audio delivery formats. It is designed to both improve efficiency and deliver a richer set of features than the second generation DTS system. The first two generations of DTS codecs were designed primarily for Channel Based Audio (CBA). DTS- UHD is primarily designed to support audio objects, where a given object can represent a channel based presentation, sound field channels, or audio objects used in Object Based Audio (OBA).
6.1. Terminology Table 1 lists terms defined in ATSC A/342-1[2] and maps them to corresponding terms defined in ETSI TS 103 491[3].
6.2. Overview The DTS-UHD bitstream supports 32 pre-defined channel locations and definition of up to 224 objects plus 32 object groups. A DTS-UHD object is a set of coded waveforms plus an associated metadata structure, which are referred to in ETSI TS 103 491 [3] as an audio chunk element, and a metadata chunk element. It is worth noting that more than one object can reference the same audio chunk. These chunks are carried within an Audio Frame. In addition to metadata required to decode the audio chunk elements, metadata chunk elements may carry metadata that will be passed downstream to a renderer, e.g. as described in TS 103 584 [9]. The audio frame is organized by a frame table of contents (FTOC) at the beginning of the frame. The FTOC locates the metadata chunks and audio chunks within the frame, and creates associations of objects, object groups, and presentations. An object group is a collection of objects always played together and assigned to a single object ID. A presentation is a list of object IDs plus some additional metadata, usually including loudness and dynamics parameters. Up to 32 presentations can be defined in a stream. A more detailed introduction to the DTS-UHD stream architecture is provided in clause 4 of ETSI TS 103 491 [3]ANSI SCTE 242-4 pdf odwnload.