IEC 60958-3:2006/AMD1:2009

IEC 60958-3 ®
Edition 3.0 2009-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Digital audio interface –
Part 3: Consumer applications
Interface audionumérique –
Partie 3: Applications grand public

IEC 60958-3:2006-05/AMD1:2009-10(en-fr)

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IEC 60958-3 ®
Edition 3.0 2009-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Digital audio interface –
Part 3: Consumer applications
Interface audionumérique –
Partie 3: Applications grand public

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX J
ICS 33.160.01 ISBN 978-2-8322-1522-7

– 2 – IEC 60958-3:2006/ AMD1:2009
© IEC 2009
FOREWORD
This amendment 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 bilingual version (2014-07) corresponds to the monolingual English version, published in
2009-10.
The text of this amendment is based on the following documents:
CDV Report on voting
100/1513/CDV 100/1592/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The French version of this amendment has not been voted upon.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site 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• withdrawn,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 revised edition, or
• amended.
____________
INTRODUCTION to Amendment 1
The revision of IEC 60958-3 (2006) has become necessary to transmit the audio signal and its
information of the current improved audio formats and systems. The revised items apply to the
small parts of IEC 60958-3.
Additional sampling frequencies have been defined for the use of audio transmission of
IEC 60958 conformant data format for the new formats of the IEC 61937 series.
CGMS-A validity is added to clarify the use of CGMS-A information.
The identification of the embedded MPEG Surround information to LPCM and its normative
Annex U are added.
Table 2 includes the new additions and Table 3 has been clarified.
2 Normative references
Insert, in the list of normative references, the following new publication:

IEC 60958-3:2006/ AMD1:2009 – 3 –
© IEC 2009
ISO/IEC 23003-1, Information technology – MPEG audio technologies – Part 1: MPEG
Surround
5.2.2 Mode 0 channel status format for digital audio equipment for consumer use
Table 2 – Mode 0 channel status format for consumer use
Replace the entire existing Table 2 by the following new Table 2:
Byte
0 a = “0” b = “0” c d Mode = “0 0”
bit 0 1 2 3 4 5 6 7
1 Category code
bit 8 9 10 11 12 13 14 15
2 Source number Channel number
bit 16 17 18 19 20 21 22 23
3 Sampling frequency
Sampling frequency Clock accuracy
extension
bit 24 25 26 27 28 29 30 31
4 Word length Original sampling frequency
bit 32 33 34 35 36 37 38 39
5 CGMS-A
CGMS-A Audio sampling frequency coefficient
validity
bit 40 41 42 43 44 45 46 47
6 Information
hidden in
PCM signal
bit 48 49 50 51 52 53 54 55
bit 56 57 58 59 60 61 62 63
bit 64 65 66 67 68 69 70 71
bit 72 73 74 75 76 77 78 79
bit 80 81 82 83 84 85 86 87
bit 88 89 90 91 92 93 94 95
bit 96 97 98 99 100 101 102 103
bit 104 105 106 107 108 109 110 111
bit 112 113 114 115 116 117 118 119
bit 120 121 122 123 124 125 126 127
bit 128 129 130 131 132 133 134 135
bit 136 137 138 139 140 141 142 143
bit 144 145 146 147 148 149 150 151
bit 152 153 154 155 156 157 158 159
bit 160 161 162 163 164 165 166 167
bit 168 169 170 171 172 173 174 175
bit 176 177 178 179 180 181 182 183
bit 184 185 186 187 188 189 190 191
a: use of channel status block. c: copyright information.
b: linear PCM identification. d: additional format information.

– 4 – IEC 60958-3:2006/ AMD1:2009
© IEC 2009
Byte 3: Sampling frequency and clock accuracy
Add, after the existing text defining Bits 28 to 29 and before NOTE 2, the following:

Bits 30 to 31 Sampling frequency extension with sampling frequency bits 24 to 27
Bit 24 25 26 27 30 31 Sampling frequency
State “1 0 1 0 0 0” 384 kHz
“1 0 1 0 1 0” 1 536 kHz
“1 0 1 0 1 1” 1 024 kHz
“1 0 1 1 0 0” 352,8 kHz
“1 0 1 1 0 1” 705,6 kHz
“1 0 1 1 1 0” 1 411,2 kHz
“1 1 0 1 0 0” 64 kHz
“1 1 0 1 0 1” 128 kHz
“1 1 0 1 1 0” 256 kHz
“1 1 0 1 1 1” 512 kHz
Replace the entire existing NOTE 2 by the following new NOTE 2:
NOTE 2 The sampling frequency over 192 kHz is not actual. It represents frame rate for compressed audio
transmission, and it is used for high bit rate transmission using IEC 60958 protocol. For example, IEC 61883-6 can
transmit a high bit rate of IEC 61937 using IEC 60958 comformant format defined in IEC 61883-6.
Byte 4: Word length and original sampling frequency:
Replace the existing text defining Bits 36 to 39 by the following:

Bits 36 to 39 Original sampling frequency
Bit 36 37 38 39
State “1 1 1 1” 44,1 kHz
“1 1 1 0” 88,2 kHz
“1 1 0 1” 22,05 kHz
“1 1 0 0” 176,4 kHz
“1 0 1 1” 48 kHz
“1 0 1 0” 96 kHz
“1 0 0 1” 24 kHz
“1 0 0 0” 192 kHz
“0 1 1 1” 128 kHz
“0 1 1 0” 8 kHz
“0 1 0 1” 11,025 kHz
“0 1 0 0” 12 kHz
“0 0 1 1” 32 kHz
“0 0 1 0” 64 kHz
“0 0 0 1” 16 kHz
“0 0 0 0” Original sampling frequency not indicated (default)
Notes 4 and 5 remain applicable.

IEC 60958-3:2006/ AMD1:2009 – 5 –
© IEC 2009
Byte 5: CGMS-A
Add, after Bits 40 to 41 and before NOTE 6, the following new text:

Bit 42 CGMS-A validity
Bit 42
State “0” No indication
“1” CGMS-A valid
Bits 44 to 47 Audio sampling frequency coefficient
Bit 44 45 46 47
State “0 0 0 0” No indication
“0 0 0 1” Equal to transmission sampling frequency
“0 0 1 0” 1/2
“0 0 1 1” 1/4
“0 1 0 0” 1/8
“0 1 0 1” 1/16
“0 1 1 0” 1/32
“0 1 1 1” Reserved
“1 0 0 0” Reserved
“1 0 0 1” Reserved
“1 0 1 0” Reserved
“1 0 1 1” x32
“1 1 0 0” x16
“1 1 0 1” x8
“1 1 1 0” x4
“1 1 1 1” x2
Add, after existing NOTE 6, the following new paragraph:
Byte 6: Information hidden in PCM signal
Bit 48 Information hidden in PCM signal
Bit 48
State “0” No indication
“1” Additional information in LSB
Bit 49 to 55 “0 0 0 0 0 0 0” Reserved

NOTE 7 Bit 48 refers to information within the audio sample word, not in the AUX bits.
NOTE 8 When bit 48 is set to 1, processing of the audio signal (such as redithering, sample rate conversion, and
change in level) should be avoided. A receiver may also use this state as a hint that it should look for extra
information (such as MPEG Surround transmitted over PCM channels as specified in ISO/IEC 23003-1, see
Annex U) in the low bits of the signal.

– 6 – IEC 60958-3:2006/ AMD1:2009
© IEC 2009
Table 3 – Category code groups
Replace the entire Table 3 by the following new Table 3:
Bits 8 to 15 Category
“000 00000” General. Used temporarily
“100 XXXXL” Laser optical products
“010 XXXXL” Digital/digital converters and signal processing products
“110 XXXXL” Magnetic tape or disc based products
“001 XXXXL” Broadcast reception of digitally encoded audio signals with or without video signals
and
“011 1XXXL”
“101 XXXXL” Musical instruments, microphones and other sources without copyright information
“011 00XXL” Analogue/digital converters for analogue signals without copyright information
“011 01XXL” Analogue/digital converters for analogue signals which include copyright information
in the form of “Cp-bit and L-bit status”
“000 1XXXL” Solid state memory based products
“000 0001L” Experimental products not for commercial sale, and other products of these groups
and/or experimental products
“111 XXXXL” Not defined. Reserved
“000 0XXXL” Not defined. Reserved, except “000 00000” and “000 0001L”

IEC 60958-3:2006/ AMD1:2009 – 7 –
© IEC 2009
Insert, after Annex T, the following new Annex U.

Annex U
(normative)
MPEG Surround over PCM
U.1 Format of MPEG Surround buried data frames
MPEG Surround bit-stream data should be embedded in conformity with ISO/IEC 23003-1, 7.3.
An MPEG Surround buried data frame contains MPEG Surround bit-stream data embedded in
the less significan
...