1、INTERNATIONAL STANDARD IEC 61603-6 First edition 2001-10 Transmission of audio and/or video and related signals using infra-red radiation Part 6: Video and audio-visual signals Reference number IEC 61603-6:2001(E)Publication numbering As from 1 January 1997 all IEC publications are issued with a des
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7、e below) for further information. Customer Service Centre If you have any questions regarding this publication or need further assistance, please contact the Customer Service Centre: Email: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00INTERNATIONAL STANDARD IEC 61603-6 First edition 200
8、1-10 Transmission of audio and/or video and related signals using infra-red radiation Part 6: Video and audio-visual signals PRICE CODE IEC 2001 Copyright - all rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including
9、photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission 3, rue de Varemb Geneva, Switzerland Telefax: +41 22 919 0300 e-mail: inmailiec.ch IEC web site http:/www.iec.ch H For price, see current catalogueCommission Electrotechnique Inter
10、nationaleInternational Electrotechnical Commission 2 61603-6 IEC:2001(E) CONTENTS FOREWORD 3 1 Scope 4 2 Normative references. 4 3 Definitions 4 4 Abbreviations. 4 5 Explanation of terms 5 6 System considerations . 5 7 General conditions for measurements 6 8 Characteristics to be specified and their
11、 methods of measurement 6 9 Interface values, performance requirements and recommendations . 8 10 Marking and contents of specifications. 10 Figure 1 Transmission chain 10 Figure 2 Location for measuring 11 Figure 3 Transmitting distance 11 Figure 4 Angle of maximum divergence at half optical radian
12、t intensity 11 Figure 5 Radiant intensity of transmitter or radiator . 11 Figure 6 Irradiance of receiver. 12 Figure 7 Characteristics of the transmitter . 12 Figure 8 Directivity characteristics of the transmitter . 12 Figure 9 Characteristics of the receiver . 13 Figure 10 Directivity characterist
13、ics of the receiver 13 Figure 11 Measuring system for spurious emission 14 Figure 12 Transmission format (composite video signal) 16 Figure 13 Transmission format (Y/C separation video signal) 15 Figure 14 Pre-emphasis circuit (example) 15 Table 1 Marking and contents of specifications 1061603-6 IEC
14、:2001(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ TRANSMISSION OF AUDIO AND/OR VIDEO AND RELATED SIGNALS USING INFRA-RED RADIATION Part 6: Video and audio-visual signals FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising al
15、l national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Stand
16、ards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC c
17、ollaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of o
18、pinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guide
19、s and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the
20、 IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is d
21、rawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61603-6 has been prepared by Technical area 3: Infrared systems, of IE
22、C technical committee 100: Audio, video and multimedia systems and equipment. The text of this standard is based on the following documents: FDIS Report on voting 100/295/FDIS 100/421/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated
23、in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 3. The committee has decided that the contents of this publication will remain unchanged until 2003. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or a
24、mended. 4 61603-6 IEC:2001(E) TRANSMISSION OF AUDIO AND/OR VIDEO AND RELATED SIGNALS USING INFRA-RED RADIATION Part 6: Video and audio-visual signals 1 Scope IEC 61603-1 specifies general requirements and methods of measurement for equipment using infrared radiation as a carrier of information. This
25、 part of IEC 61603 specifies requirements and methods of measurement for analogue video transmission systems which are not covered by IEC 61603-1, nor by other standards. It allows systems which make different economic use of the available bandwidth to be described in order for conclusions regarding
26、 interference and compatibility to be drawn. NOTE For details of audio transmission systems, see IEC 61603-2. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61603. For dated references, subs
27、equent amend- ments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 61603 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the l
28、atest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 61603-1, Transmission of audio and/or video and related signals using infra-red radiation Part 1: General IEC 61603-2, Transmission of audio and/or v
29、ideo and related signals using infra-red radiation Part 2: Transmission systems for audio wide band and related signals IEC 61938, Audio, video and audiovisual systems Interconnections and matching values Preferred matching values of analogue signals 3 Definitions For the purposes of this part of IE
30、C 61603, the definitions given in Part 1 apply. 4 Abbreviations IR infrared (see IEC 61603-1) IRED infrared emitting diode (see IEC 61603-1) PD photo diode O/E optical/electrical Tx transmitter/radiator Rx receiver ND filter neutral density filter61603-6 IEC:2001(E) 5 5 Explanation of terms 5.1 Comb
31、ined transmitter and radiator A combined transmitter and radiator (illustrated as element A-B in figure 1) does not have an electrical output. 5.2 Receiver As well as the general characteristics given in IEC 61603-1, other characteristics may need to be specified if a receiver (illustrated as elemen
32、t B-C in figure 1) is combined with other functions, such as a television set. 5.3 Ancillary equipment Ancillary equipment, such as power supplies or battery chargers, may be required for the operation of a system. The manufacturer shall specify all the necessary data for correct operation and maint
33、enance. 5.4 Transmission of video signals The transmission format of composite video signals and Y/C video signals are specified in this part of IEC 61603. 5.5 Safety aspects Safety aspects are considered in IEC 61603-1. 6 System considerations 6.1 Area of application This part of IEC 61603 describe
34、s a single-channel infrared video transmission system in one direction, mainly used for viewing a video programme from a VCR, video camera, or video disc player. NOTE 1 In consumer applications, video signals may be available in composite video signals or in Y/C component video signals. NOTE 2 A cha
35、nnel for video signals is defined in IEC 61603-1. NOTE 3 Audio signal transmission systems are specified in IEC 61603-2. NOTE 4 Transmission systems for high-speed data and remote control are under consideration. 6.2 Environmental conditions for operation The environmental conditions for the equipme
36、nt are mainly defined in relevant standards for individual units. Unless otherwise specified, the equipment shall at least be capable of operating within the following temperature and relative humidity ranges: 5 C to 40 C, and 25 % RH to 75 % RH Systems and apparatus in accordance with this part of
37、IEC 61603 are primarily used indoors, with the advantage of operating more than one interference-free system in adjacent rooms. 6.3 Partition of functions between elements of the systems Due to the different applications for different room sizes, equipment is designed in various combinations of func
38、tional blocks. It is desirable to have only a few blocks of small size and low installation cost for home application. 6 61603-6 IEC:2001(E) 7 General conditions for measurements 7.1 Test conditions Temperature: 15 C to 35 C Humidity: 45 % RH to 75 % RH Brightness: 500 lx to 1 000 lx (on the surface
39、 of the receiver) Normal (i.e. not operating at high frequency) fluorescent lamps shall be used. 7.2 Location A sufficiently large room should be used for the test, so that the reflection of infrared radiation from the walls, floor and ceiling is negligible. NOTE The location illustrated in figure 2
40、 may be used if a correction due to reflection is made. An absorbing optical filter (neutral density or ND filter) is applied to the transmitter or the receiver. The following precautions are essential: a) take into account the correlation between the absorption of the filter and the transmitting di
41、stance; b) when measuring directivity, adjust the filter to the direction of the transmitter; c) maintain the brightness at the receiver within the 500 lx to 1 000 lx range. 8 Characteristics to be specified and their methods of measurement 8.1 Transmitting distance and directivity 8.1.1 Transmittin
42、g distance Calculate the transmitting distance (as illustrated in figure 3) using the following equation: E I d = 0 where d 0 is the transmitting distance (in m); I is the specified radiant intensity (in mW/sr), and E is the irradiance value (in mW/m 2 ). The transmitting distance d (in m) at the an
43、gle of maximum divergence at half the optical radiant intensity (such as H 1 , H 2 , V 1 , and V 2illustrated in figure 4) may be calculated as follows: d I E d = 2 1 2 0 8.1.2 Characteristic of the transmitter to be specified The radiant intensity I (in mW/sr) in the optical axis (see figure 5). Me
44、asurement methods shall be in accordance with IEC 61603-1.61603-6 IEC:2001(E) 7 8.1.3 Characteristics of the receiver to be specified The minimum required irradiance E (in mW/m 2 ) for an unweighted signal-to-noise (S/N) ratio of 40 dB under the following conditions (see figure 6): Directivity: opti
45、cal axis (0) Signal: 50 % white Frequency deviation: 2 MHz (sync tip: 11,5 MHz, peak white: 13,5 MHz) Bandwidth: NTSC: 100 kHz to 4,2 MHz PAL: 100 kHz to 5,0 MHz 8.1.4 Maximum transmitting distance Calculate the maximum transmitting distance from the specified radiant intensity I (see 8.1.2) and the
46、 irradiance value E (see 8.1.3), using the equation specified in 8.1.1. NOTE In another method, the maximum transmitting distance for an unweighted S/N ratio of 40 dB under the conditions of 8.1.3 can be measured by aligning the optical axes of the transmitter and receiver, without measurement of th
47、e radiant intensity of the transmitter and the irradiance at the receiver. 8.1.5 Directivity 8.1.5.1 Directivity characteristics of the transmitter to be specified Use an optical power meter to measure radiant intensity on the optical axis “AB” (as illustrated in figure 7). Measure the radiant inten
48、sity at the vertical and horizontal angles H1 and V1 in accordance with 8.1.2. Then find the directivity of the transmitter by measuring the radiant intensity I (in mW/sr) at various angles H1and V1at the transmitter (see figure 8). Calculate the directivity characteristics of the transmitting dista
49、nce from the above directivity characteristics and the irradiance E of receiver (8.1.3) using the equation specified in 8.1.1. 8.1.5.2 Directivity characteristics of the receiver to be specified Use a transmitter giving a higher S/N ratio and the receiver to be measured on the optical axis (0 degree) as below. Measure the minimum required irradiance E (in mW/m 2 ) for an unweighted S/N ratio of 40 dB under the conditions specified in 8.1.3, by changing the distance b
