Transmission of audio and/or video and related signals using infrared radiation - Part 8-1: Digital audio and related signals

IEC 61603-8-1:2003 specifies the characteristics and measuring methods for digital audio signal transmission systems using infrared radiation with sub-carrier of the frequency ranges 3 MHz to 6 MHz. It describes systems with different economic uses of the available bandwidth in order to obtain minimum interference and maximum compatibility. It replaces 6.8.3 of IEC 61603-2. This bilingual version, published in 2011-04, corresponds to the English version.

Transmission de signaux audio et/ou vidéo et de signaux similaires par rayonnement infrarouge - Partie 8-1: Signaux audio numériques et similaires

La CEI 61603-8-1:2003 spécifie les caractéristiques et les méthodes de mesure de systèmes de transmission de signaux audio numériques par rayonnement infrarouge avec des sous-porteuses entre 3 MHz et 6 MHz. Elle décrit des systèmes avec des utilisations économiquement différentes de la bande passante disponible en vue d'un brouillage minimal et d'une compatibilité maximale. Elle remplace le 6.8.3 de la CEI 61603-2. La présente version bilingue, publiée en 2011-04, correspond à la version anglaise.

General Information

Status
Published
Publication Date
03-Nov-2003
Current Stage
PPUB - Publication issued
Start Date
04-Nov-2003
Completion Date
04-Nov-2003
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IEC 61603-8-1
Edition 1.0 2003-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Transmission of audio and/or video and related signals using infrared
radiation –
Part 8-1: Digital audio and related signals
Transmission de signaux audio et/ou vidéo et de signaux similaires par
rayonnement infrarouge –
Partie 8-1: Signaux audio numériques et similaires
IEC 61603-8-1:2003
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61603-8-1
Edition 1.0 2003-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Transmission of audio and/or video and related signals using infrared
radiation –
Part 8-1: Digital audio and related signals
Transmission de signaux audio et/ou vidéo et de signaux similaires par
rayonnement infrarouge –
Partie 8-1: Signaux audio numériques et similaires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 33.040.20; 33.160.99 ISBN 978-2-88912-443-5
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61603-8-1  IEC:2003
CONTENTS

FOREWORD ........................................................................................................................... 5

1 Scope ............................................................................................................................... 7

2 Normative references ....................................................................................................... 7

3 Terms, definitions and abbreviations ................................................................................ 7

3.1 Terms and definitions .............................................................................................. 7

3.2 Abbreviations .......................................................................................................... 8

4 System description ........................................................................................................... 8

4.1 General ................................................................................................................... 8

4.2 Area of application .................................................................................................. 9

4.3 Band allocation ....................................................................................................... 9

5 General characteristics ................................................................................................... 11

5.1 Environment conditions for operation .................................................................... 11

5.2 Partition of functions between elements of the systems ......................................... 11

6 Specific requirements ..................................................................................................... 11

6.1 Block diagram ....................................................................................................... 11

6.2 Input and output .................................................................................................... 12

6.3 Carrier ................................................................................................................... 12

6.4 Sub-carrier ............................................................................................................ 12

6.5 Channel allocation ................................................................................................. 12

6.6 Block structure ...................................................................................................... 14

6.7 Source stream ....................................................................................................... 14

6.8 Transmission stream ............................................................................................. 19

6.9 Modulation ............................................................................................................ 21

7 Characteristics and measurements ................................................................................. 26

7.1 Test conditions ...................................................................................................... 26

7.2 Location ................................................................................................................ 26

7.3 Transmitting distance and directivity ...................................................................... 26

7.4 Spurious level ....................................................................................................... 28

7.5 Accuracy of transmission-check frequency ............................................................ 28

8 Marking and contents of specifications ........................................................................... 28

8.1 Marking ................................................................................................................. 28

8.2 Contents of specifications ..................................................................................... 28

Annex A (normative) Application of the transmission systems for digital audio and

related signals using infrared radiation in the consumer audio mode ..................................... 33

Annex B (normative) Application of the transmission systems for digital audio and

related signals using infrared radiation in the professional audio mode ................................. 42

Figure 1 – System concept ..................................................................................................... 9

Figure 2 – IEC 61603 band allocation ................................................................................... 10

Figure 3 – Band allocation .................................................................................................... 10

Figure 4 – Transmitter .......................................................................................................... 11

Figure 5 – Channel-coding block ........................................................................................... 12

Figure 6 – Channel allocation ............................................................................................... 13

Figure 7 – Block structure ..................................................................................................... 14

Figure 8 – Source stream ...................................................................................................... 15

---------------------- Page: 4 ----------------------
61603-8-1  IEC:2003 – 3 –

Figure 9 – Source_block stream............................................................................................ 15

Figure 10 – Source_info stream ............................................................................................ 16

Figure 11 – Block alignment .................................................................................................. 17

Figure 12 – Parity check matrix ............................................................................................. 18

Figure 13 – Error correction code block ................................................................................ 19

Figure 14 – Transmission stream .......................................................................................... 19

Figure 15 – The order bytes in Tr_section ............................................................................. 20

Figure 16 – Modulation block ................................................................................................ 21

Figure 17 – Byte to symbol conversion .................................................................................. 22

Figure 18 – XOR gates ......................................................................................................... 22

Figure 19 – Scramble pattern generator ................................................................................ 23

Figure 20 – QPSK mapping................................................................................................... 24

Figure 21 – Baseband filter characteristics ........................................................................... 25

Figure 22 – Transmission chain ............................................................................................ 29

Figure 23 – Location for measurements ................................................................................ 29

Figure 24 – Transmitting distance ......................................................................................... 29

Figure 25 – Angle of half optical radiant intensity .................................................................. 29

Figure 26 – Optical axis of the transmitter ............................................................................. 30

Figure 27 – Optical axis of the receiver ................................................................................. 30

Figure 28 – Characteristics of the transmitter ........................................................................ 30

Figure 29 – Directivity characteristics of the transmitter ........................................................ 31

Figure 30 – Characteristics of the receiver ............................................................................ 31

Figure 31 – Directivity characteristics of the receiver ............................................................ 32

Figure 32 – Measuring system for spurious emission ............................................................ 32

Figure A.1 – Source_info structure ........................................................................................ 33

Figure A.2 – crc_area ........................................................................................................... 38

Figure A.3 – Linear feedback shift register circuit ................................................................. 38

Figure A.4 – Sub-frame structure of full-band mode .............................................................. 39

Figure A.5 – Sub-frame structure of half-band mode ............................................................. 41

Figure B.1 – Source_info structure ........................................................................................ 42

Figure B.2 – CRC area ......................................................................................................... 46

Figure B.3 – Linear feedback shift register circuit ................................................................. 47

Figure B.4 – Sub-frame structure of full-band mode .............................................................. 47

Figure B.5 – Sub-frame structure of half-band mode ............................................................. 50

Table 1 – Analogue audio channel allocation ........................................................................ 10

Table 2 – Sub-carrier frequency ............................................................................................ 12

Table 3 – Maximum source stream bit rate ............................................................................ 13

Table 4 – Bit rate of digital audio .......................................................................................... 13

Table 5 – Byte values in a transmission_info ....................................................................... 16

Table 6 – Reed-Solomon code parameter ............................................................................. 17

Table 7 – Header bit field ...................................................................................................... 20

Table 8 – Marking and contents of specifications .................................................................. 28

---------------------- Page: 5 ----------------------
– 4 – 61603-8-1  IEC:2003

Table A.1 – crc_flag .............................................................................................................. 35

Table A.2 – Valid_flag ........................................................................................................... 35

Table A.3 – Data_type .......................................................................................................... 35

Table A.4 .............................................................................................................................. 36

Table A.5 – Mode_extension_code ....................................................................................... 36

Table A.6 – pro_flag ............................................................................................................. 36

Table A.7 – pcm_id ............................................................................................................... 36

Table A.8 – Copyright_flag.................................................................................................... 37

Table A.9 – Emphasis ........................................................................................................... 37

Table A.10 – fs_code ............................................................................................................ 37

Table A.11 – Mode_extension_code ..................................................................................... 40

Table B.1 – Crc_flag ............................................................................................................. 44

Table B.2 – Valid_flag ........................................................................................................... 44

Table B.3 – Data_type .......................................................................................................... 44

Table B.4 – Coding_mode ..................................................................................................... 44

Table B.5 – Mode_extension_code ....................................................................................... 45

Table B.6 – pro_flag ............................................................................................................. 45

Table B.7 – pcm_id ............................................................................................................... 45

Table B.8 – Emphasis ........................................................................................................... 45

Table B.9 – fs_code .............................................................................................................. 46

Table B.10 – Mode_extension_code ..................................................................................... 49

---------------------- Page: 6 ----------------------
61603-8-1  IEC:2003 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TRANSMISSION OF AUDIO AND/OR VIDEO
AND RELATED SIGNALS USING INFRARED RADIATION –
Part 8-1: Digital audio and related signals
FOREWORD

1) The International Electrotechnical Commission (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

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services carried out by independent certification bodies.

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expenses arising out of the publication, use of, or reliance upon, this IEC Publication 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 Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61603-8-1 has been prepared by technical area 3, Infrared

systems and applications, of IEC technical committee 100: Audio, video and multimedia

systems and equipment.
This part of IEC 61603 replaces 6.8.3 of IEC 61603-2.

This bilingual version, published in 2011-04, corresponds to the English version.

The text of this standard is based on the following documents:
FDIS Report on voting
100/628/FDIS 100/706/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
---------------------- Page: 7 ----------------------
– 6 – 61603-8-1  IEC:2003

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 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.
---------------------- Page: 8 ----------------------
61603-8-1  IEC:2003 – 7 –
TRANSMISSION OF AUDIO AND/OR VIDEO
AND RELATED SIGNALS USING INFRARED RADIATION –
Part 8-1: Digital audio and related signals
1 Scope

This part of IEC 61603 specifies the characteristics and measuring methods for digital audio

signal transmission systems using infrared radiation with sub-carrier of the frequency ranges

3 MHz to 6 MHz. It describes systems with different economic uses of the available bandwidth

in order to obtain minimum interference and maximum compatibility.
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, the latest edition

of the referenced document (including any amendments) applies.
IEC 60958-1, Digital audio interface – Part 1: General
IEC 60958-3, Digital audio interface – Part 3: Consumer applications
IEC 60958-4, Digital audio interface – Part 4: Professional applications

IEC 61603-1:1997, Transmission of audio and/or video and related signals using infra-red

radiation – Part 1: General

IEC 61603-2:1997, Transmission of audio and/or video and related signals using infra-red

radiation – Part 2: Transmission systems for audio wide band and related signals

IEC 61937:2000, Digital audio – Interface for non-linear PCM encoded audio bitstreams

applying IEC 60958

IEC 61938, Audio and audiovisual systems – Interconnections and matching values –

Preferred matching values of analogue signals
3 Terms, definitions and abbreviations
3.1 Terms and definitions

For the purposes of this part of IEC 61603, the definitions given in Part 1 together with the

following apply.
3.1.1
source stream

source_block stream with a corresponding source_info stream and transmission_info stream

3.1.2
block_structure
structure of data and parties for transmission
---------------------- Page: 9 ----------------------
– 8 – 61603-8-1  IEC:2003
3.1.3
Tr_section
interleaved stream from the block_structure
3.2 Abbreviations
For the purposes of this part of IEC 61603, the following abbreviations apply.
IR infrared (see IEC 61603-1)
PD photo diode
O/E optical/ electrical
Tx transmitter/ radiator
Rx receiver
QPSK quadrature phase shift keying
DQPSK differential encoded QPSK
Transmission_info transmission information
CRC cyclic redundancy check
source_info source information
Sync Gen. sync pattern generator
Header Gen. header generator
GF galois field
RS Reed-Solomon code
ECC error correction code
4 System description
4.1 General

This part of 61603 defines an application using digital audio signals based on the digital audio

interface, IEC 60958, for professional and consumer applications. This includes an ability to

transmit non-linear PCM data formatted according to IEC 61937.

The digital audio bitstream transmission systems that are the subject of this document are

characterized by the following features:
– used for interface with infrared radiation,
– harmonized with IEC 60958;
– harmonized with IEC 61937;
– used for multi-channel transmission in future;
– signal block structure;
– error correction;
– frequency range: 3 MHz to 6 MHz;
– channel coding;
– low spurious (band-pass filter).

This standard gives the detailed specifications of the digital audio signal transmission.

Infrared digital audio signal transmission is used in a frequency range of 3 MHz to 6 MHz as

specified in IEC 61603-2. It shares this range with analogue audio applications, so that care

should be taken to avoid interference with any such applications being used simultaneously.

---------------------- Page: 10 ----------------------
61603-8-1  IEC:2003 – 9 –

This system supports a full-band mode that carries all the data on the IEC 60958 interface at

sample rates of 48 kHz and below. It also supports a half-band mode carrying two streams

each of two 16-bit audio channels without the capacity for all the associated validity data, user

data, or channel status data defined in IEC 60958. Some of those data are carried elsewhere

in the system.

Depending on the applicable bit rate, two different channel bandwidths are possible. One is

called the full-band mode, which carries 2 channels, 32-slot bit stream with the bandwidth of

3 MHz wide, the other is called the half-band mode, which carries 2 channels, 16-slot bit

stream with the bandwidth of 1,5 MHz wide.

Both the full-band mode and half-band mode are based on IEC 60958-1, IEC 60958-3,

IEC 60958-4 and IEC 61937.
The system concept is shown in Figure 1.
Digital
audio Transmitter
equipment
Infrared
Infrared Infrared
radiator detector
Digital
Receiver audio
equipment
IEC 2495/03
Figure 1 – System concept
4.2 Area of application

This digital audio signal transmission system using infrared radiation is mainly used for

transmitting digital audio signals from a CD player, DAT player or MD player, etc. to

headphones, speakers and infrared receivers, etc.
4.3 Band allocation

In IEC 61603-2, the band allocation for high quality audio transmission ranges from 2 MHz to

6 MHz is as shown in Figure 2.
---------------------- Page: 11 ----------------------
– 10 – 61603-8-1  IEC:2003
Remote

control High speed remote control

system system / Data transmission

0, 04 0,1 1
2 6 10 30 MHz
Sub-carrier

Audio transmission / Conference High-fidelity

Video transmission

systems (analogue and digital) audio transmission

IEC 2496/03
Figure 2 – IEC 61603 band allocation

There are 8 channels in this band, named H1 through H8, for analogue audio signals, as

defined in Table 1.
In gene
...

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