1、 IEC 60958-4-2 Edition 1.0 2016-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio interface Part 4-2: Professional applications Metadata and subcode Interface audionumrique Partie 4-2: Applications professionnelles Mtadonnes et sous-code IEC 60958-4-2:2016-03(en-fr) THIS PUBLICATION IS CO
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19、cation ou si vous avez des questions contactez-nous: csciec.ch. IEC 60958-4-2 Edition 1.0 2016-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio interface Part 4-2: Professional applications Metadata and subcode Interface audionumrique Partie 4-2: Applications professionnelles Mtadonnes e
20、t sous-code INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 33.160.30 ISBN 978-2-8322-3247-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtain
21、ed this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 60958-4-2:2016 IEC 2016 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references. 7 3 Terms, definitions and abbreviations 7 3.1 T
22、erms and definitions 7 3.2 Abbreviations 8 4 User data format 8 5 Channel status format 8 5.1 Channel status bit . 8 5.2 Channel status block . 8 5.3 Implementation . 9 5.3.1 Implementation levels 9 5.3.2 Transmitter requirement . 9 5.3.3 Receiver requirement . 9 5.4 Documentation 9 5.5 Channel stat
23、us content 9 5.5.1 General . 9 5.5.2 Byte 0: Basic audio parameters 11 5.5.3 Byte 1: Channel modes, user bits management . 12 5.5.4 Byte 2: Auxiliary bits, word length and alignment level 12 5.5.5 Byte 3: Multichannel modes 13 5.5.6 Byte 4: DARS, hidden information, multiple-rate sampling frequencie
24、s 14 5.5.7 Byte 5: Reserved . 15 5.5.8 Bytes 6 to 9: Alphanumeric channel origin 16 5.5.9 Bytes 10 to 13: Alphanumeric channel destination 16 5.5.10 Bytes 14 to 17: Local sample address code 16 5.5.11 Bytes 18 to 21: Time-of-day sample address code 16 5.5.12 Byte 22: Reserved . 16 5.5.13 Byte 23: Ch
25、annel status data CRCC . 17 5.6 Channel status when non-PCM audio is flagged . 17 6 Auxiliary bits 17 6.1 Availability of auxiliary bits 17 6.2 Use of auxiliary bits . 17 Annex A (informative) Channel modes 18 Annex B (informative) Provision of additional, voice-quality channels 19 Annex C (informat
26、ive) Generation of CRCC (byte 23) for channel status . 20 Bibliography . 22 Figure 1 Channel status data format . 10 Figure B.1 Frame and block structure . 19 Figure C.1 Flow diagram including exclusive or gates . 20 IEC 60958-4-2:2016 IEC 2016 3 Table 1 Non-PCM audio, protected status bits 17 4 IEC
27、 60958-4-2:2016 IEC 2016 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DIGITAL AUDIO INTERFACE Part 4-2: Professional applications Metadata and subcode FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnic
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38、ll such patent rights. International Standard IEC 60958-4-2 has been prepared by technical area 4: Digital system interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia systems and equipment. This first edition, together with IEC 60958-4-1 and IEC 60958-4-4, cancels an
39、d replaces IEC 60958-4 published in 2003 and its Amendment 1:2008 and constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 60958-4:2003 with its Amendment 1:2008: a) support for a wider range of physical media; b) support for a wider
40、 range of audio sampling frequencies; c) deprecation of “minimum implementation” of channel status data. IEC 60958-4-2:2016 IEC 2016 5 The text of this standard is based on the following documents: CDV Report on voting 100/2453/CDV 100/2582/RVC Full information on the voting for the approval of this
41、 standard can be found in the report on voting indicated in the above table. A list of all parts in the IEC 60958 series, published under the general title Digital audio interface, can be found on the IEC website. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. T
42、he committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revise
43、d edition, or amended. 6 IEC 60958-4-2:2016 IEC 2016 INTRODUCTION The two-channel digital audio interface has been widely used in a variety of professional audio applications that have reached beyond the vision of the original standard. In particular, applications using increased sampling frequencie
44、s and alternative physical media. Separating the standard into independently-maintainable parts allows, for example, additional transmission media to be introduced in the future by revising IEC 60958-4-4 without affecting the other parts of the IEC 60958-4 series. The parts comprise: Part 4-1: Audio
45、 content: defines the format for coding audio used for the audio content. It specifies the semantics of the audio data, including the “validity“ flag. It also specifies the sampling frequency by reference to AES5. Part 4-2: Metadata and subcode: specifies the format for information, metadata, or sub
46、code transmitted with the audio data: principally the “channel status“ but also user data and the auxiliary bits. Implementors will note that the current implementation options (“Standard“ and “Enhanced“) both require that status data be implemented correctly in compliant equipment. Part 4-4: Physic
47、al and electrical parameters: specifies the physical signals that convey the bit stream specified in IEC 60958-1. The transport format is intended for use with shielded twisted-pair cable of conventional design over distances of up to 100 m at frame rates of up to 50 kHz. Longer cable lengths and hi
48、gher frame rates may be used, but with a rapidly increasing requirement for care in cable selection and possible receiver equalization, or the use of active repeaters. Provision is made in this standard for adapting the balanced terminals to use 75 coaxial cable. Transmission by fibre-optic cable is
49、 under consideration. IEC 60958-4-2:2016 IEC 2016 7 DIGITAL AUDIO INTERFACE Part 4-2: Professional applications Metadata and subcode 1 Scope This part of IEC 60958 specifies the format for coding metadata, or subcode, that relates to the audio content and is carried with it. This part of IEC 60958, together with IEC 60958-1, IEC 60958-4-1, and IEC 60958-4-4, specifies an interface for serial digital transmissio
