1、BRITISH STANDARD BS EN 60958-4:2003 Digital audio interface Part 4: Professional applications (TA4) ICS 33.160.30 +A1:2008National foreword This British Standard is the UK implementation of EN 60958-4:2003 +A1:2008. It is identical with IEC 60958-4:2003, incorporating amendment 1:2008. It supersedes
2、 BS EN 60958-4:2003, which is withdrawn. The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to IEC text carry the number of the IEC amendment. For example, text altered by IEC amendment 1 is indicated by !“. The UK participation
3、in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contra
4、ct. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. BS EN 60958-4:2003+A1:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 15 December 2003 BSI 2009 ISBN
5、 978 0 580 67096 1 Amendments/corrigenda issued since publication Date Comments 31 July 2009 Implementation of IEC amendment 1:2008 with CENELEC endorsement A1:2008EUROPEAN STANDARD EN 60958-4:2003+A1 NORME EUROPENNE EUROPISCHE NORM May 2008 CENELEC European Committee for Electrotechnical Standardiz
6、ation 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
7、ICS 33.160.30 Supersedes EN 60958-4:2000English 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
8、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
9、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
10、 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
11、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
12、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
13、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
14、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
15、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
16、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. _ Page2 BS EN 60958-4:2003+A1:2008 EN 60958-4:2003+A1:2008Foreword to amendment A1 The t
17、ext of document 100/1330/FDIS, future amendment 1 to IEC 60958-4:2003, prepared by technical area 4, Digital system interfaces and protocols of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 to
18、 EN 60958-4:2003 on 2008-04-01. The following dates were fixed: latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2009-01-01 latest date by which the national standards conflicting with the amendment ha
19、ve to be withdrawn (dow) 2011-04-01 _ Endorsement notice The text of amendment 1:2008 to the International Standard IEC 60958-4:2003 was approved by CENELEC as an amendment to the European Standard without any modification. _ BS EN 60958-4:2003+A1:2008 EN 60958-4:2003+A1:2008 Page 3 blankCONTENTS IN
20、TRODUCTION.6 1 Scope.7 2 Normative references7 3 Terms and definitions .7 4 Interface format7 4.1 General.7 4.2 Validity bit7 5 Channel status8 5.1 General.8 5.2 Professional linear PCM application.8 6 User data16 6.1 General.16 6.2 Application.16 7 Implementation.16 7.1 General.16 7.2 Transmitter16
21、 7.3 Receivers 17 8 Electrical requirements .17 8.1 General.17 8.2 Balanced line.17 Annex ZA (normative) Normative references to international publications with their corresponding European publications23 Bibliography24 Figure 1 Simplified example of the configuration of the circuit (balanced)18 Fig
22、ure 2 Intrinsic jitter measurement filter.19 Figure 3 Jitter attenuation mask (optional) 19 Figure 4 Eye diagram .20 Figure 5 A suggested equalizing characteristic for the receiver operating at a frame rate of 48 kHz .20 Figure 6 Receiver jitter tolerance template21 Table 1 Channel status data forma
23、t for professional linear PCM application9 8.3 Unbalanced coaxial cables 22 BS EN 60958-4:2003+A1:2008 EN 60958-4:2003+A1:2008 Page 5 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 r
24、esolution of up to 24 bits per sample. It may alternatively be used to carry signals sampled at other rates such as 32 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 ind
25、icate other sample rates does not imply that it is recommended that equipment supports these rates. To eliminate doubt, 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 tr
26、ansmission equalization or any special equalization at the receiver and at frame rates of up to 50 kHz. Longer cable 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
27、information are transmitted along with the audio data. Provision is also made to allow the interface to carry non-audio data. BS EN 60958-4:2003+A1:2008 EN 60958-4:2003+A1:2008 Page 6DIGITAL AUDIO INTERFACE Part 4: Professional applications 1 Scope This International Standard specifies the professio
28、nal application of the interface for the interconnection of digital audio equipment defined in IEC 60958-1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references,
29、the latest edition of the referenced document (including any amendments) applies. IEC 60268-12:1987, Sound system equipment Part 12: Application of connectors for broadcast and similar use IEC 60958-1, Digital audio interface Part 1: General IEC 60958-3, Digital audio interface Part 3: Consumer appl
30、ications ISO/IEC 646:1991, Information technology ISO 7-bit coded character set for information interchange ITU-T Recommendation J.17:1988, Pre-emphasis used on sound-programme circuits ITU-T Recommendation V.11:1996, Electrical characteristics for balanced double-current inter- change circuits oper
31、ating 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 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 d
32、efined 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 standard, 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 aud
33、io signal using linear PCM coding. BS EN 60958-4:2003+A1:2008 EN 60958-4:2003+A1:2008 Page 75 Channel status 5.1 General The channel status for each audio signal carries information associated with that audio signal; thus it is possible for different channel status data to be carried in the two sub-
34、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 address code, alphanumeric source and destination codes, and pre-emphasis. Channel status information is organized i
35、n 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 numbered 0 to 191. The primary application is indicated by channel status bit 0. For the professional applications de
36、scribed 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. Secondary applications may be defined within the framework of these primary applications. 5.2 Professional linear PC
37、M 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 an interface conforming to IEC 60958-3 (“consumer use”) can be identified. Also, a “professional use” transmissio
38、n, 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 might result in unpredictable operation. Thus, the byte definitions in this clause apply only when bit 0 = “1” a
39、nd bit 1 = “0” (professional linear PCM use of the channel status block). BS EN 60958-4:2003+A1:2008 EN 60958-4:2003+A1:2008 Page 8Table 1 Channel status data format for professional linear PCM application Byte 0 a = “1” b = “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 1
40、6 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 51 52 53 54 55 7 Alphanumeric channel origin data Bit 56 57 58 59 60 61 62 63 8
41、 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 destination data bit 88 89 90 91 92 93 94 95 12 Alphanumeric channel destination d
42、ata 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 (32-bit binary) bit 120 121 122 123 124 125 126 127 16 Local sample address c
43、ode (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 day code (32-bit binary) bit 152 153 154 155 156 157 158 159 20 Time of day code
44、 (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 184 185 186 187 188 189 190 191 a: use of channel status block b: linear PCM
45、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 number l: channel number m: multichannel mode number n: multichannel mode o:
46、digital audio reference signal p: reserved but undefined at present q: sampling frequency r: sampling frequency scaling flag BS EN 60958-4:2003+A1:2008 EN 60958-4:2003+A1:2008 Page 9Byte 0 Bit 0 Use of channel status block State “1” Professional use of channel status block (note 1) Bit 1 Linear PCM
47、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 signal pre-emphasis. Bit 2 3 4 State “0 0 0
48、” 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 Recommendation J.17 pre-emphasis (with 6,5 dB insertion
49、 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. 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
