IEC 60958-4-1-2016 Digital audio interface - Part 4-1 Professional applications - Audio content《数字音频接口.第4-1部分 专业设备.音频内容》.pdf

1、 IEC 60958-4-1 Edition 1.0 2016-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio interface Part 4-1: Professional applications Audio content Interface audionumrique Partie 4-1: Applications professionnelles Contenu audio IEC 60958-4-1:2016-03(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTE

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19、s avez des questions contactez-nous: csciec.ch. IEC 60958-4-1 Edition 1.0 2016-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio interface Part 4-1: Professional applications Audio content Interface audionumrique Partie 4-1: Applications professionnelles Contenu audio INTERNATIONAL ELECTR

20、OTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 33.160.30 ISBN 978-2-8322-3232-3 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an auth

21、orized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 60958-4-1:2016 IEC 2016 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references. 6 3 Terms and definitions 6 4 Audio content 7 4.1 Audio content coding . 7 4.2 P

22、CM polarity . 7 4.3 Coding precision options . 7 4.4 Intermediate coding precision 8 4.5 Non-audio content . 8 4.6 DC content 8 5 Sampling frequency . 8 5.1 Channel interdependency 8 5.2 Choice of sampling frequency 8 6 Validity bit . 8 6.1 Channel validity usage 8 6.2 Independent channel validity .

23、 8 7 Pre-emphasis 8 7.1 Pre-emphasis characteristic 8 7.2 Pre-emphasis indication 9 Bibliography . 10 IEC 60958-4-1:2016 IEC 2016 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DIGITAL AUDIO INTERFACE Part 4-1: Professional applications Audio content FOREWORD 1) The International Electrotechnical Com

24、mission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

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33、tion or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publica

34、tion may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60958-4-1 has been prepared by technical area 4: Digital system interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia

35、systems and equipment. This first edition, together with IEC 60958-4-2 and IEC 60958-4-4, cancels and 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 60958-4:20

36、03 with its Amendment 1:2008: a) support for a wider range of physical media; b) support for a wider range of audio sampling frequencies; c) deprecation of “minimum implementation” of channel status data. 4 IEC 60958-4-1:2016 IEC 2016 The text of this standard is based on the following documents: CD

37、V Report on voting 100/2452/CDV 100/2581/RVC Full information on the voting for the approval of this 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

38、 IEC website. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The 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 spec

39、ific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended IEC 60958-4-1:2016 IEC 2016 5 INTRODUCTION The two-channel digital audio interface has been widely used in a variety of professional audio applications that have reached beyond t

40、he vision of the original standard. In particular, applications using increased sampling frequencies 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

41、-4 without affecting the other parts of the IEC 60958-4 series. The parts comprise: Part 4-1: Audio 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 referenc

42、e to AES5. Part 4-2: Metadata and subcode: specifies the format for information, metadata, or subcode 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“)

43、both require that status data be implemented correctly in compliant equipment. Part 4-4: Physical 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 d

44、esign over distances of up to 100 m at frame rates of up to 50 kHz. Longer cable lengths and higher 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 fo

45、r adapting the balanced terminals to use 75 coaxial cable. Transmission by fibre-optic cable is under consideration. 6 IEC 60958-4-1:2016 IEC 2016 DIGITAL AUDIO INTERFACE Part 4-1: Professional applications Audio content 1 Scope This part of IEC 60958 specifies the format for coding audio used for t

46、he audio content. Together with IEC 60958-1, IEC 60958-4-2, and IEC 60958-4-4, it specifies an interface for serial digital transmission of two channels of periodically sampled and linearly represented digital audio data from one transmitter to one receiver. It is expected that the audio data will h

47、ave been sampled at any of the sampling frequencies recognized by AES5. The capability of the interface to indicate other sample rates does not imply that it is recommended that equipment support these rates. To eliminate doubt, equipment specifications should define supported sampling frequencies.

48、2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amend

49、ments) applies. IEC 60958-1, Digital audio interface Part 1: General IEC 60958-4-2, Digital audio interface Part 4-2: Professional applications Metadata and subcode IEC 60958-4-4, Digital audio interface Part 4-4: Professional applications Physical and electrical parameters ITU-R Recommendation BS.450-3, Transmission standards for FM sound broadcasting at VHF ITU-T Recommendation J.17, Pre-emphasis used on sound-pro