BS-EN-60958-4-2003.pdf

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1、BRITISH STANDARD BS EN 60958-4:2003 Digital audio interface Part 4: Professional applications (TA4) The European Standard EN 60958-4:2003 has the status of a British Standard ICS 33.160.30 ? BS EN 60958-4:2003 This British Standard was published under the authority of the Standards Policy and Strate

2、gy Committee on 15 December 2003 BSI 15 December 2003 ISBN 0 580 43085 5 National foreword This British Standard is the official English language version of EN 60958-4:2003. It is identical with IEC 60958-4:2003. It supersedes BS EN 60958-4:2000 which is withdrawn. The UK participation in its prepar

3、ation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement internatio

4、nal or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport t

5、o include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any

6、 enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 21 and a

7、back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD EN 60958-4 NORME EUROPENNE EUROPISCHE NORM October 2003 CENELEC European Committee for Electrotechnical Standardiza

8、tion Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60958-4:2003 E I

9、CS 33.160.30 Supersedes EN 60958-4:2000 English version Digital audio interface Part 4: Professional applications (TA4) (IEC 60958-4:2003) Interface audionumrique Partie 4: Applications professionnelles (TA4) (CEI 60958-4:2003) Digitalton-Schnittstelle Teil 4: Professioneller Gebrauch (IEC 60958-4:2

10、003) This European Standard was approved by CENELEC on 2003-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliograph

11、ical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a

12、 CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, L

13、ithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 100/643/FDIS, future edition 2 of IEC 60958-4, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELE

14、C parallel vote and was approved by CENELEC as EN 60958-4 on 2003-10-01. This European Standard supersedes EN 60958-4:2000. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 200

15、4-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-10-01 The main changes with respect to EN 60958-4:2000 are: The scope specifies the professional application of EN 60958-1 (generalities have been removed to an introduction). A clause on term

16、s and definitions has been added. In Table 1, expanded channel status assignments have been added and channel status definitions expanded to accommodate extended sampling frequencies, indication of alignment level and multi- channel options. Figure 1 and associated text has been revised to be more g

17、eneralized. Three notes on cable performance factors have been added. The impedance specification is now dependent on maximum frame rate. The common-mode balance specification is now dependent on maximum frame rate. Annexes designated “normative“ are part of the body of the standard. In this standar

18、d, annex ZA is normative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60958-4:2003 was approved by CENELEC as a European Standard without any modification. _ Page 2 EN 609584:2003 CONTENTS INTRODUCTION.4 1 Scope.5 2 Normative references5 3 Term

19、s and definitions .5 4 Interface format 5 4.1 General .5 4.2 Validity bit5 5 Channel status6 5.1 General .6 5.2 Professional linear PCM application.6 6 User data14 6.1 General .14 6.2 Application.14 7 Implementation.14 7.1 General .14 7.2 Transmitter14 7.3 Receivers 15 8 Electrical requirements .15

20、8.1 General .15 8.2 Balanced line.15 Annex ZA (normative) Normative references to international publications with their corresponding European publications20 Bibliography21 Figure 1 Simplified example of the configuration of the circuit (balanced)16 Figure 2 Intrinsic jitter measurement filter.17 Fi

21、gure 3 Jitter attenuation mask (optional)17 Figure 4 Eye diagram .18 Figure 5 A suggested equalizing characteristic for the receiver operating at a frame rate of 48 kHz .18 Figure 6 Receiver jitter tolerance template19 Table 1 Channel status data format for professional linear PCM application7 Page

22、3 EN 609584:2003 INTRODUCTION The interface specified in this standard is primarily intended to carry monophonic or stereophonic programmes at a 48 kHz sampling frequency and with a resolution of up to 24 bits per sample. It may alternatively be used to carry signals sampled at other rates such as 3

23、2 kHz, 44,1 kHz, or 96 kHz. Note that conformity to this interface specification does not require equipment to utilize these rates and also that the capability of the interface to indicate other sample rates does not imply that it is recommended that equipment supports these rates. To eliminate doub

24、t, equipment specifications should define the supported sampling frequencies. The format is intended for use with shielded twisted-pair cables over distances of up to 100 m without transmission equalization or any special equalization at the receiver and at frame rates of up to 50 kHz. Longer cable

25、lengths and higher frame rates may be used with cables better matched for data transmission, or with receiver equalization, or both. In both cases, the clock references and auxiliary information are transmitted along with the audio data. Provision is also made to allow the interface to carry non-aud

26、io data. Page 4 EN 609584:2003 DIGITAL AUDIO INTERFACE Part 4: Professional applications 1 Scope This International Standard specifies the professional application of the interface for the interconnection of digital audio equipment defined in IEC 60958-1. 2 Normative references The following referen

27、ced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60268-12:1987, Sound system equipment Part 12: Application of conn

28、ectors for broadcast and similar use IEC 60958-1, Digital audio interface Part 1: General IEC 60958-3, Digital audio interface Part 3: Consumer applications ISO/IEC 646:1991, Information technology ISO 7-bit coded character set for information interchange ITU-T Recommendation J.17:1988, Pre-emphasis

29、 used on sound-programme circuits ITU-T Recommendation V.11:1996, Electrical characteristics for balanced double-current inter- change circuits operating at data signalling rates up to 10 Mbit/s 3 Terms and definitions The terms and definitions given in IEC 60958-1 apply to this part of IEC 60958. 4

30、 Interface format 4.1 General The interface format as defined in IEC 60958-1 shall be used. For historical reasons, preambles “B”, “M” and “W”, as defined in 4.3 of IEC 60958-1, shall, for use in professional applications, be referred to as “Z”, “X” and “Y”, respectively. 4.2 Validity bit For this s

31、tandard, the validity bit shall be used to indicate whether the main data field bits in the sub-frame are suitable for conversion to an analogue audio signal using linear PCM coding. Page 5 EN 609584:2003 5 Channel status 5.1 General The channel status for each audio signal carries information assoc

32、iated with that audio signal; thus it is possible for different channel status data to be carried in the two sub-frames of the digital audio signal. Examples of information to be carried in the channel status are: length of audio sample words, number of audio channels, sampling frequency, sample add

33、ress code, alphanumeric source and destination codes, and pre-emphasis. Channel status information is organized in a 192-bit block, subdivided into 24 bytes, numbered 0 to 23 (see Table 1). The first bit of each block is carried in the frame with preamble “Z”. The individual bits of a block are numb

34、ered 0 to 191. The primary application is indicated by channel status bit 0. For the professional applications described here, this first channel status bit equals “1”. NOTE For consumer digital audio equipment, this first channel status bit equals “0”, and this part of IEC 60958 does not apply. Sec

35、ondary applications may be defined within the framework of these primary applications. 5.2 Professional linear PCM application The specific organization of the channel status data is defined in this clause and summarized in Table 1. The significance of byte 0, bit 0 is such that a transmission from

36、an interface conforming to IEC 60958-3 (“consumer use”) can be identified. Also, a “professional use” transmission, defined in this part of IEC 60958, can be correctly identified by a “consumer use” receiver. Connection of a “consumer use” transmitter with a “professional use” receiver or vice versa

37、 might result in unpredictable operation. Thus, the byte definitions in this clause apply only when bit 0 = “1” and bit 1 = “0” (professional linear PCM use of the channel status block). Page 6 EN 609584:2003 Table 1 Channel status data format for professional linear PCM application Byte 0 a = “1” b

38、 = “0” C d e Bit 0 1 2 3 4 5 6 7 1 f g Bit 8 9 10 11 12 13 14 15 2 h i j Bit 16 17 18 19 20 21 22 23 3 k n=”0” l m n=”1” Bit 24 25 26 27 28 29 30 31 4 o p q r Bit 32 33 34 35 36 37 38 39 5 Reserved but undefined at present Bit 40 41 42 43 44 45 46 47 6 Alphanumeric channel origin data Bit 48 49 50 5

39、1 52 53 54 55 7 Alphanumeric channel origin data Bit 56 57 58 59 60 61 62 63 8 Alphanumeric channel origin data Bit 64 65 66 67 68 69 70 71 9 Alphanumeric channel origin data Bit 72 73 74 75 76 77 78 79 10 Alphanumeric channel destination data bit 80 81 82 83 84 85 86 87 11 Alphanumeric channel dest

40、ination data bit 88 89 90 91 92 93 94 95 12 Alphanumeric channel destination data bit 96 97 98 99 100 101 102 103 13 Alphanumeric channel destination data bit 104 105 106 107 108 109 110 111 14 Local sample address code (32-bit binary) bit 112 113 114 115 116 117 118 119 15 Local sample address code

41、 (32-bit binary) bit 120 121 122 123 124 125 126 127 16 Local sample address code (32-bit binary) bit 128 129 130 131 132 133 134 135 17 Local sample address code (32-bit binary) bit 136 137 138 139 140 141 142 143 18 Time of day code (32-bit binary) bit 144 145 146 147 148 149 150 151 19 Time of da

42、y code (32-bit binary) bit 152 153 154 155 156 157 158 159 20 Time of day code (32-bit binary) bit 160 161 162 163 164 165 166 167 21 Time of day code (32-bit binary) bit 168 169 170 171 172 173 174 175 22 Reliability flags bit 176 177 178 179 180 181 182 183 23 Cyclic redundancy check character bit

43、 184 185 186 187 188 189 190 191 a: use of channel status block b: linear PCM identification c: audio signal pre-emphasis d: lock indication e: sampling frequency f: channel mode g: user bits management h: use of auxiliary sample bits i: source word length j: indication of alignment level k: channel

44、 number l: channel number m: multichannel mode number n: multichannel mode o: digital audio reference signal p: reserved but undefined at present q: sampling frequency r: sampling frequency scaling flag Page 7 EN 609584:2003 Byte 0 Bit 0 Use of channel status block State “1” Professional use of chan

45、nel status block (note 1) Bit 1 Linear PCM identification State “0” Audio sample word represents linear PCM samples (note 1) “1” Audio sample word used for purposes other than linear PCM samples NOTE 1 The functions of channel status bits 0 and 1 are defined in IEC 60958-1. Bits 2 to 4 Encoded audio

46、 signal pre-emphasis. Bit 2 3 4 State “0 0 0” Pre-emphasis not indicated. Receiver defaults to no pre- emphasis with manual override enabled. “1 0 0” No pre-emphasis. Receiver manual override is disabled. “1 1 0” 50 s/15 s pre-emphasis. Receiver manual override is disabled. “1 1 1” ITU-T Recommendat

47、ion J.17 pre-emphasis (with 6,5 dB insertion loss at 800 Hz). Receiver manual override is disabled. All other states of bits 2 to 4 are reserved and shall not be used until further defined. Bit 5 Lock indication State “0” Default, lock condition not indicated. “1” Source sampling frequency unlocked.

48、 Bits 6 to 7 Encoded sampling frequency Bit 6 7 State “0 0” Sampling frequency not indicated. Receiver defaults to 48 kHz and manual override or auto set is enabled. “0 1” 48 kHz sampling frequency. Receiver manual override or auto set is disabled. “1 0” 44,1 kHz sampling frequency. Receiver manual

49、override or auto set is disabled. “1 1” 32 kHz sampling frequency. Receiver manual override or auto set is disabled. NOTE 2 The indication of sampling frequency, or the use of one of the sampling frequencies that can be indicated in this byte, is not a requirement for operation of the interface. The 00 state of bits 6 to 7 may be used if the transmitter does not support the indication of sampling frequency, if the sampling freque