BS-EN-50080-1991.pdf
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1、BRITISH STANDARD BS EN 50080:1991 Specification for RF characteristics of MAC AM-VSB cable receivers This European Standard EN 50080:1991 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:55:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50080:1991 T
2、his British Standard, was published under the authority of the Standards Board and comes into effect on 20 December 1991 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference EEL/25 Draft announced in BSI News, October 1991 ISBN 0 580 20304 2 Cooperating o
3、rganizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following Western European countries. AustriaItaly BelgiumLuxembourg DenmarkNetherlands FinlandNorway
4、 FrancePortugal GermanySpain GreeceSweden IcelandSwitzerland IrelandUnited Kingdom Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:55:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50080:1991 BSI 03-2000i Contents Page Cooperati
5、ng organizationsInside front cover National forewordii Foreword2 Text of EN 500803 National appendix NA (informative)Inside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:55:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50080:1991 ii BSI 03-2000 National foreword This Bri
6、tish Standard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English language version of EN 50080:1991 “RF characteristics of MAC AM-VSB cable receivers”, published by the European Committee for Electrotechnical Standardization (CENELEC). A Br
7、itish Standard does 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 fr
8、ont cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Co
9、py: sheffieldun sheffieldun, na, Mon Nov 06 07:55:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50080 May 1991 UDC 621.397.743:621.397.63 Descriptors: Telecommunication, cabled television, receiver, demodulator, signal, characteristic English vers
10、ion RF characteristics of MAC AM-VSB cable receivers Caractristiques RF des rcepteurs MAC en MA/BLR pour tlvision par cbles RF Merkmale von MAC AM-RSB Kabel-Empfngern This European Standard was approved by CENELEC on 15 March 1991. CENELEC members are bound to comply with the CEN/CENELEC Internal Re
11、gulations 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 or to any CENELEC member.
12、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 official versions. CENELEC mem
13、bers are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit E
14、uropen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1991 Copyright reserved to CENELEC members Ref. No. EN 50080:1991 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:55:37 GMT+00:00 2006, Uncon
15、trolled Copy, (c) BSI EN 50080:1991 BSI 03-2000 2 Foreword This European Standard has been prepared by CENELEC Technical Committee TC 106, MAC receiving equipment. The text was submitted to the CENELEC Unique Acceptance Procedure (UAP) in July 1990. The text of the draft was approved by all CENELEC
16、members with the exception of Finland as EN 50080 on 15 March 1991. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex A is normative. Contents Page Foreword2 Introduction3 1Scope3 2RF Characteristics of MAC AM-VSB cable recei
17、vers3 3Characteristics of the modulated signal3 Annex A (normative)6 Figure 1 Filter characteristics of the receiver4 Figure 2 Carrier levels5 Figure A.1 Filter characteristics of the modulator7 latest date of publication of an identical national standard(dop) 1992-03-01 latest date of withdrawal of
18、 conflicting national standards(dow) 1992-03-01 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:55:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50080:1991 BSI 03-20003 Introduction The introduction of MAC transmission standards and the need to provide a possibility to introduce HDMAC s
19、ignals at a later stage, gave rise for the need to standardize the RF characteristics of MAC AM-VSB cable receivers. This standard is so far restricted to the use of MAC signals in the hyperband, some countries are however envisaging additional transmissions outside this band. The most notable diffe
20、rence with the RF characteristics in case of conventional transmissions is the location of the vision Nyquist slope, which is the transmitter. This is done to improve the noise properties of the whole transmission chain. Optimized behaviour of the complete AM-VSB CATV system will be attained only by
21、 correctly matching both RF receiver characteristics as well as RF transmitter characteristics. Therefore the RF transmitter characteristics described in Annex A are normative. 1 Scope This standard specifies the RF characteristics for MAC AM-VSB cable receivers and defines the behaviour of the rece
22、iver demodulator by referring to the characteristics of the modulated signal. It takes into account the development of the HDMAC specification and ensures compatibility with the HDMAC transmission parameters. 2 RF Characteristics of MAC AM-VSB cable receivers 3 Characteristics of the modulated signa
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