Sy_idd_1017s Revision Summary For Nrsc Transition From

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  SY_IDD_1017s Revision Summary for NRSC Transition from Revision F to Revision G.29 ITEM Change Description Section(s) Affected Revision iBiquity Configuration Management System 1 All ƒ iBiquity Document Management Process 2 Formatted to match the iBiquity style template All / Relevant 3 All Reference Documents are listed/maintained in SY_REF_2690 Reference Documents All cross-references 4 Grammar corrections and sentence structure improvements Terminology and word usage improvements All / Relevant 5 Updated abbreviations and acronyms Section 3.1: Abbreviations and Acronyms 6 Added definitions for data constant formats for binary numbers and hexadecimal numbers Section 3.3.3: Data Constant Formats 7 Resolved the proper use of the terms: audio frames, encoded audio packets, PDUs Section 4: Audio Transport Section 5.2: PDU Characteristics 8 Deleted the modifier “MPS” from the phrase “MPS PDUs” Relevant sections/figures 9 Added content regarding the Audio Encoder: The Audio Encoder is flexible in format and bit rate scaling. It provides high quality, efficient audio compression over a variety of formats from 8.1-kbit/s for a monophonic channel to 96-kbit/s for a stereo audio format. The audio transport also provides a fixed rate Program Service Data byte-stream channel and supports variable rate opportunistic data channel. Section 4.2: Audio Encoder 10 Added content regarding Blending: Another form of blending in the Hybrid AM and Hybrid FM systems applies to SPS. For SPS, no specific time alignment is required, as the blend involves transition between audio and silence. Section 4.3.1: Blending 11 Added content regarding Additional Delay Compensation: Additional delay compensation may be requested in the units of audio samples, and the decoded audio stream is delayed by that amount. Another case requiring proper handling of delay information on both the encoding side and the decoding side involves multi-stream programs. The enhanced stream must be aligned with the core stream; otherwise audio distortion may occur at the decoder output. In the case of multi-stream programs, the core stream is the base audio stream (where delay parameters are irrelevant) and only the enhanced stream carries relevant delay information. Section 4.3.2: Additional Delay Compensation 12 Added details regarding the description of PDU Structure so that the description is harmonized with the associated figure (PDU Format) Section 5.2.1: PDU Structure 13 Specified the codec modes for the PDU Control Word Added figure for PDU Control Word for Codec Mode 15 Section 5.2.1: PDU Structure 14 Added content regarding Codec Mode 15: The PDU header for codec mode 0b1111 (15) is shown in Figure 5 3. It includes the indication of the codec mode itself, followed by a 16-bit “PDU end locator” that points to the end of the PDU (i.e., the last byte of the PDU). The end of the PDU refers to the first byte of the PDU as byte number 0 (zero). Section 5.2.1: PDU Structure   F G.29   ITEM 15 Change Description Section(s) Affected Added content regarding Audio Codec Mode: Single-stream audio codec modes, while configured to 18 kbps and above, may contain a two-channel audio (stereo) signal. This also applies to multiple-stream systems when all streams are valid at the decoder input. However, if just the primary stream of a multiplestream is valid at the decoder input, the audio may be either stereo or mono depending on the audio codec mode and the configured bit rate. A monophonic signal (L and R) is always decoded or presented as a dual-mono (that is, identical left and right channels) signal by the audio decoder. Revision Section 5.2.1.1: Audio Codec Mode Table 5-2 shows the maximum bit rate for each codec mode in the context indicated by the “Typical Use” column. The actual configured rate may be less than the maximum rates. 16 Improved the details in the table: Audio Codec Mode Definitions Table 5-2 Section 5.2.1.1: Audio Codec Mode 17 Improved the details in the table: Defined Output Bit Rates for the Audio Codec Table 5-3 Section 5.2.1.1: Audio Codec Mode 18 Focused the content and added details to the content associated with TX Digital Audio Gain Section 5.2.1.3: TX Digital Audio Gain 19 Added/improved the content associated with Header Expansion Fields: Class Indication Program Number Program Type PDU Marker Rules for including a header expansion indication Section 5.2.1.6: Header Expansion Fields 20 Improved the details regarding PSD Processing Improved the details in the table: PSD per Audio Codec Mode Table 5-10 Section 5.2.2: PSD Processing 21 Improved the terms/phrasing regarding Error Control Codes Section 5.2.3: Error Control Codes 22 Added the section regarding Audio Encryption Section 5.2.4: Audio Encryption 23 Improved the terms/phrasing in the Glossary Glossary 24 Clarified/Improved the content associated with Class Indication Section 5.2.1.6.1: Class Indication 25 Clarified/Improved the content associated with Program Number Indication Section 5.2.1.6.2: Program Number Indication 26 Clarified/Improved the content associated with Program Type Indication Section 5.2.1.6.3: Program Type Indication 27 Clarified/Improved the content associated with PDU Marker Indication Section 5.2.1.6.5: PDU Marker Indication G.29 iBiquity Configuration Management System 28 29 All ƒ iBiquity Document Review Process Subject Matter Expert Group – Document Review All iBiquity Configuration Management System 30 All ƒ iBiquity Document Release to the NRSC Process Transition from Revision F to Revision G.29 Revision Summary for NRSC SY_IDD_1017s