ANSI SCTE 242-2 pdf free download
ANSI SCTE 242-2 pdf free download.Next Generation Audio Coding Constraints for Cable Systems: Part 2- AC-4 Audio Coding Constraints.
2.1. SCTE References [1] SCTE 242-1 2017, Next Generation Audio Coding Constraints for Cable Systems: Part 1 – Introduction and Common Constraints 2.2. Standards from Other Organizations [2] ATSC S34-187r12, ATSC Candidate Standard: A/342 Part 1, Audio Common Elements [3] ATSC S34-188r7, ATSC Candidate Standard: A/342 Part 2, AC-4 System [4] ATSC A/85:2013, ATSC Recommended Practice: Techniques for Establishing and Maintaining Audio Loudness for Digital Television [5] ETSITS 103 190-1 V1.2.1 (2015-06), Digital Audio Compression (AC-4) Standard; Part 1: Channel based coding [6] ETSITS 103 190-2 V1.1.1 (2015-08-30), Digital Audio Compression (AC-4) Standard; Part 2: Immersive and personalized audio 3. Informative References The following documents might provide valuable information to the reader but are not required when complying with this document. 3.1. SCTE References [7] ANSI/SCTE 54 2015, Digital Video Service Multiplex and Transport Subsystem Standard for Cable Television [8] SCTE 243-1 2017, Next Generation Audio Carriage Constraints for Cable Systems: Part 1 – Common Transport Signaling [9] SCTE 243-2 2017, Next Generation Audio Carriage Constraints: Part 2 – AC-4 Audio Carriage Constraints
5. Abbreviations and Definitions 5.1. Abbreviations SCTE Society of Cable Telecommunications Engineers 6. AC-4 System Overview AC-4 is a highly efficient audio codec that supports legacy channel-based content, object-based and channel-based immersive content, personalized content, and advanced metadata as defined in ETSITS 103 190-2 [6]. A complete description of the AC-4 system features is available in ATSC A/342 Part 1 [2] section 5.1 and A/342 Part 2 [3] section 4. 7. AC-4 Coding Specifications AC-4 audio elementary streams shall comply with the syntax and semantics contained in ETSI TS 103 190-2 [6] , as well as the parts of ETSITS 103 190-1 [5] referenced by ETSI TS 103 190-2 [6], as constrained in the following sections. 7.1. General Coding Constraints AC-4 audio elementary streams shall comply with the constraints defined in ATSC A/342 Part 2 [3], Section 5.2.
7.2. Loudness and DRC Constraints In order to comply with the loudness recommendations in ATSC A/85 [4], AC-4 audio elementary streams shall comply with the constraints defined in ATSC A/342 Part 2 [3], Section 5.3. 7.3. Personalized Audio Constraints In order to provide a consistent listener experience, AC-4 audio elementary streams shall comply with the constraints defines in ATSC A/342 Part 2 [3], Section 5.4. 7.4. Multi-Stream (Hybrid) Constraints When AC-4 presentations reference audio elements that are contained in more than one elementary stream, the relevant AC-4 audio elementary streams shall comply with the constraints defined in ATSC A/342 Part 2 [3], Section 5.5.ANSI SCTE 242-2 pdf download.
