1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 50157-2-1:1999 The
2、European Standard EN 50157-2-1:1998 has the status of a British Standard ICS 33.160.30; 33.160.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Domestic and similar electronic equipment interconnection requirements: AV. link Part 2-1: Signal quality matching and automatic se
3、lection of source devicesBS EN 50157-2-1:1999 This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 March 1999 BSI 03-1999 ISBN 0 580 32042 1 Amendments issued
4、 since publication Amd. No. Date Text affected National foreword This British Standard is the English language version of EN 50157-2-1:1998. It supersedes BS EN 50157-2-1:1997 which will be withdrawn on 1999-08-01. The UK participation in its preparation was entrusted by Technical Committee EPL/100,
5、 Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/3, Equipment and systems in the field of audio, video and audiovisual engineering, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the int
6、erpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standard
7、s which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard d
8、oes not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an in
9、side front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover.CENELEC European Committee for Electrotechnical Standardization Comite Europe en de Normalisation Electrotechnique Europa isches Komitee fu r Electrotechnische Normung Central Secretariat: rue de Stassart 36, B
10、-1050 Brussels 1998 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50157-2-1:1998 E EUROPEAN STANDARD EN 50157-2-1 NORME EUROPE ENNE EUROPA ISCHE NORM August 1998 ICS 33.160.30; 33.160.40 Supersedes EN 50157-2-1:1996 Descriptors: t
11、elevision systems, peritelevision devices, appliance interconnections, audiovisual materials, characteristics, electrical properties, mechanical properties, signals, inspection, measurements English version Domestic and similar electronic equipment interconnection requirements: AV. link Part 2-1: Si
12、gnal quality matching and automatic selection of source devices Spe cification des interconnexions des e quipements e lectroniques domestiques et a usage analogue: AV. link Partie 2-1: Adaptation de la qualite du signal et se lection automatique des e quipements sources Kennwerte fu r die Kleinsigna
13、lverbindung zwischen elektronischen Gera ten fu r den Heimgebrauch und a hnliche Anwendungen: AV. link Teil 2-1: Qualitatives Anpassen von Signalen und automatisches Auswa hlen von Signalquellen This European Standard was approved by CENELEC on 1998-08-01. CENELEC members are bound to comply with th
14、e 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 bibliographical references concerning such national standards may be obtained on application to the Central Secretariat o
15、r 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 CENELEC member into its own language and notified to the Central Secretariat has the same status as the offic
16、ial versions. CENELEC members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 50157-2-1:1998 BSI 03-1999 Forew
17、ord This European Standard was prepared by the former Technical Committee CENELEC TC 203, Electronic entertainment and educational systems for household and similar use (in July 1998 TC 203 became part of TC 206, Consumer equipment for entertainment and information and related sub-systems). The text
18、 of the draft was submitted to the formal vote and was approved by CENELEC as EN 50157-2-1 on 1998-08-01. This European Standard supersedes EN 50157-2-1:1996. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national s
19、tandard or by endorsement (dop) 1999-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1999-08-01 The structure of the AV. link chain concept, the way of introducing new socket and plug connectors and new cord-sets, the use of the logo, and the reco
20、mmended application information and corresponding chain and device requirements are given in EN 50157-1, Domestic and similar electronic equipment interconnection requirements: AV. link Part 1: General. Specific types of AV. link are described in different parts 2 of the EN 50157 series. This part 2
21、-1 contains items related to Signal quality matching and automatic selection of sources devices. Philips Electronics N.V. is willing to grant non-exclusive, non-transferable licenses on fair, reasonable and non-discriminatory terms and conditions under its registered trademark AV. LINK and under any
22、 of its patents rights, under which it has the free right to grant licences and to the extent necessary to comply with this standard, for use in devices that fully perform in accordance with this standard to any third party which has or will submit an equivalent undertaking with respect to this stan
23、dard. Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 The chain principle 3 4 Field of application 5 5 Rules of conformity to the chain 5 6 Characteristics of the interconnections 7 7 Characteristics of the control system 8 8 Control signal specification 8 9 Contact 7 di
24、rection conflict 15 10 Special application cases 17 11 Control signal line arbitration and error handling 18Page 3 EN 50157-2-1:1998 BSI 03-1999 Introduction Reasons for the establishment of this part 2-1. Part 2-1 of the AV. link defines the basic structure of the AV. link standard. Within this par
25、t a control signal line at contact 10 is introduced to have the possibility for automatic bi-directional signal quality matching of the AV signals and automatic selection of active source devices (see clauses 7 to 10). This part describes the signals which are changed with respect to EN 50049-1 to h
26、ave the capability to fulfil automatic signal quality matching and source selection in a bi-directional way. By introducing automatic signal quality matching the need for better means of interconnection was established; therefore in EN 50157-1 the characteristics for a new plug and socket and a rela
27、ted cord-set are introduced. The backwards compatibility to existing connectors in accordance with EN 50049-1 has been maintained with the introduction of the new cord-set. Further to be able to guarantee this quality to the user, recommended system and device requirements are defined which can be f
28、ound in EN 50157-1 as well. 1 Scope This standard specifies an extension with the possibility to start with only two devices as a point-to-point interconnection (only a display unit combined with a low end VTR) and then building it up towards a chain configuration (serial interconnection of devices)
29、 with respect to the existing CENELEC standard EN 50049-1 which specifies only the characteristics of the point-to-point interconnection system for audiovisual equipment. This standard defines the interconnection characteristics of peritelevision devices which are configured in the chain principle.
30、This standard makes use of a control signal at contact 10 which gives the possibility for automatic source de-selection and quality matching of AV-signals. This standard describes the AVC-signals in line with EN 50049-1. This standard gives system and device oriented requirements which have to be fu
31、lfilled if use is made of the logo related to this standard to ensure the customer a certain signal quality is achieved. The AV. link logo is defined in EN 50157-1. This standard gives the possibility to have a bi-directional interconnection of Y0/C0 signals. This standard gives the possibility to h
32、ave a bi-directional control of the aspect ratio of 16:9 and 4:3. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed h
33、ereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 50049-1, Domestic and similar
34、 electronic equipment interconnection requirements: Peritelevision connector. EN 50157-1, Domestic and similar electronic equipment interconnection requirements: AV. link Part 1: General. 3 The chain principle The chain configuration is characterized by the following: 1) serial interconnection of de
35、vices see Figure 1a); the simplest chain consists of two devices see Figure 1b). For adding an AV device, only an extra cord-set is needed. The customer has to be informed that the number of devices in one chain is limited due to a decreased quality level of the AV-signals, if too many devices (more
36、 than 6) are connected; 2) independent simultaneous actions on the up-stream and the down-stream path, e.g. the possibility of simultaneous display of one AV device acting as a source and the recording of another AV device acting as a second source; 3) availability of simple control signals, among o
37、thers to match the signal quality level of AV devices acting as a source and AV devices acting as a destination; 4) bi-directional interconnection of Y0/C0 signals; simultaneous use of RGB and Y0/C0 is not possible; 5) bi-directional interconnection of aspect ratio information (16:9 and 4:3). 6) bac
38、kwards compatibility with a type of equipment which fulfils EN 50049-1r 6 with respect to Audio, CVBS, RGB display signals and Function Switching (slow switching) Voltage with an eventual superimposed remote control signal; 7) backwards compatibility with a type of equipment which fulfils EN 50049-1
39、 with respect to the C0-signal (of Y0/C0) on contact 15 and the aspect ratio control signal on contact 8; easy interconnection between any of two devices in the chain, e.g. to copy from VCR 1 to VCR 2;Page 4 EN 50157-2-1:1998 BSI 03-1999 Figure 1a) Signal path interconnection chain principle 8) the
40、possibility to connect a display unit which fulfils EN 50049-1 at the top of the chain and a type of equipment (AV device) which fulfils EN 50049-1 at the tail of the chain; in this case the automatic control functions do not work; 9) in the introduction phase of products in accordance with EN 50157
41、-1 it is allowed to start with connectors and the cord-set marked type U in accordance with EN 50049-1. Backwards compatibility in the chain with AV devices which fulfils EN 50049-1 is only possible with improved quality cables. In future the use of cables in accordance with EN 50049-1 will be preve
42、nted by mechanical means (under consideration); 10) the possibility to connect at the tail of the chain one “tail AV device”, which is provided with the control signal but only has one connector and no loop-through switching. It only is possible to connect one “EN 50049-1” or “tail AV. link” AV devi
43、ce to the bottom of the chain.Page 5 EN 50157-2-1:1998 BSI 03-1999 NOTE For a VTR with only one connector II (see part 1, subclause 5.3) it is allowed to leave out this connector and connect the cable (with one plug) itself to the device. The signals on the plug have to correspond to connector II. I
44、f manufacturing in this way care has to be taken that the device inclusive of the fixed cable has to fulfil the standard to be able to use the logo. Figure 1b) Signal path interconnection Chain principle, minimum configuration 4 Field of application 4.1 This standard applies to the connector sockets
45、 type I and type II, mounted on the display unit (only connector type I) and on the AV devices connected to the chain-type audiovisual system. It includes the designation of contacts, the type of signals and the electrical matching values. 4.2 This standard applies to the plugs fitted to both ends o
46、f the cord-set. 4.3 It covers the interconnection cord-set itself (type of conductors, wiring). This cord-set incorporates all the interconnections covered by this standard. The applied cord-set shall meet the performance requirements specified in EN 50157-1. 4.4 Permanent interconnection of all dev
47、ices connected to the chain is ensured by means of looping-through of the signals. 4.5 Application of this standard is mandatory for devices carrying the chain label (logo) specified in EN 50157-1. 5 Rules of conformity to the chain AV equipment to be connected to the chain which fulfils this standa
48、rd shall be in accordance with the following rules of conformity. 5.1 Each AV device shall be provided with one of each two differently wired sockets see Figure 1b), defined in EN 50157-1: Connector type II: to connect devices in the direction towards the display (upwards); Connector type I: to conn
49、ect devices in the direction away from the display (downwards). For a display unit a connector type II is not allowed. More than one type I connectors are allowed (see Figure 2) which gives the possibility for independent multi chain configurations. If the audio signals have to be connected to an external audio amplifier, this can be executed by means of a separate standardized connection.Page 6 EN 50157-2-1:1998 BSI 03-1999 NOTE * = Descrambler connection not forming a part of the chain. Figure 2 Exampl
