1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 50256:1998 The Euro
2、pean Standard EN 50256:1998 has the status of a British Standard ICS 33.160.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Characteristics of DVB receiversBS EN 50256:1998 This British Standard, having been prepared under the direction of the Electrotechnical Sector Commit
3、tee, was published under the authority of the Standards Committee and comes into effect on 15 December 1998 BSI 1998 ISBN 0 580 30397 7 Amendments issued since publication Amd. No. Date Text affected National foreword This British Standard is the English language version of EN 50256:1998. The UK par
4、ticipation in its preparation was entrusted by Technical Committee EPL 100, Audio, video and multimedia systems and equipment, to Subcommittee EPL 100/1, Radio receiving equipment, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee an
5、y enquiries on the interpretation, 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-reference
6、s The British Standards 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
7、. A British 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 comprise
8、s a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover.CENELEC European Committee for Electrotechnical Standardization Comite Europe en de Normalisation Electrotechnique Europa isches Komitee fu r Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-
9、1050 Brussels 1998 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50256:1998 E EUROPEAN STANDARD EN 50256 NORME EUROPE ENNE EUROPA ISCHE NORM April 1998 ICS 33.160.20 Descriptors: television systems, television broadcasting, digita
10、l technics, television receivers, decoders, television by satellite, cable television, specifications English version Characteristics of DVB receivers Caracte ristiques des re cepteurs DVB Eingenschaften von DVB-Empfa ngern This European Standard was approved by CENELEC on 1997-10-01. CENELEC member
11、s are bound to comply with the 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
12、 to the Central Secretariat or 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
13、 the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Pa
14、ge 2 EN 50256:1998 BSI 1998 Foreword This European Standard was prepared by the Technical Committee CENELEC TC 206, Broadcast receiving equipment. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50256 on 1997-10-01. The following dates were fi
15、xed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-11-01Page 3 EN 50256:1998 BSI 1998 1 Scope
16、This standard specifies the characteristics of digital video broadcast (DVB) receivers for satellite, cable and terrestrial reception in Europe. 2 Definition DVB receivers are intended to receive and decode programs transmitted according to the DVB system standards ETS 300 421, ETS 300 429 and ETS 3
17、00 744. 3 References The following documents include provisions which, through reference in this text, constitute provisions of this standard. If the reference standard is subject to revision, the latest version, including amendments, will apply. 3.1 Normative references Digital broadcasting systems
18、 for television, sound and data services: ETS 300 421, Framing structure, channel coding and modulation for 11/12 GHz satellite services. ETS 300 429, Framing structure, channel coding and modulation for cable systems. ETS 300 468, Specification for service information (SI) in digital video broadcas
19、ting (DVB) systems. ETS 300 472, Specification for conveying ITU-R teletext in digital video broadcasting (DVB) bitstreams. ETS 300 473, Satellite master antenna television (SMATV) distribution systems. ETS 300 744, Framing structure, channel coding and modulation for digital terrestrial television.
20、 ETR 154, Implementation guidelines for the use of MPEG-2 systems, video and audio in satellite and cable broadcasting applications in Europe. Others: EN 50049-1, Domestic and similar electronic equipment interconnection requirements Peritelevision connector. EN 50082-1, Electromagnetic compatibilit
21、y Generic immunity standard Part 1: Residential, commercial and light industry. EN 50083-7, Cabled distribution systems for television and sound signals Part 7: System performance. EN 50157-1, Domestic and similar electronic equipment interconnection requirements AV link Part 1: General. EN 50201, I
22、nterfaces for DVB-IRD. EN 50221, Common interface specification for conditional access and other digital video broadcasting decoder applications. EN 55013, Limits and methods of measurements of radio disturbance characteristics of broadcast receivers and associated equipment. (CISPR 13) EN 55020, El
23、ectromagnetic immunity of broadcast receivers and associated equipment. EN 55022, Limits and methods of measurement of radio disturbance characteristics of information technology equipment. (CISPR 22) EN 60958, Digital audio interface. (IEC 60958) EN 61319-1, Interconnections of satellite receiving
24、equipment Part 1: Europe. (IEC 61319-1) EN 61938, Audio, video and audiovisual systems Interconnections and matching values Preferred matching values of analogue signals. (IEC 61938) IEC 60169-2, Radio-frequency connectors Part 2: Coaxial unmatched connector. IEC 60169-24, Radio-frequency connectors
25、 Part 24: Radio-frequency coaxial connectors with screw coupling, typically for use in 75 ohm cable distribution systems (type F). (Harmonized as EN 60169-24) ISO/IEC 13818-1, Coding of moving pictures and associated data. 4 Characteristics of the front end 4.1 Satellite QPSK-receiver 4.1.1 RF-param
26、eters Input frequency range 950 MHz to 2 150 MHz (The aim of this specification is to cover the 10,7 GHz2 12,75 GHz frequency range in the KU band. If receiver and LNB are handled together as a system, different solutions are possible) Input level range 47 dB(mV) to 77 dB(mV) (262 dBm to232 dBm) RF-
27、bandwidth Compatible with the satellite system used NOTE Examples of transponder bandwidth values foreseen in Europe are 33 MHz (1 dB) and 26 MHz (1 dB).Page 4 EN 50256:1998 BSI 1998 Nominal input impedance 75V (F-type, IEC 60169-24) IF-loop through In the case of a digital-only receiver, IF-loop th
28、rough is recommended for the connection of an analogue satellite receiver. The output connector shall be of the same type as the input connector. The signal shall be present at the output connector independently of the operational status of the receiver. The active receiver in the loop has the prior
29、ity concerning the LNB control signals NOTE A possible problem is oscillator leakage. LNB supply voltage, supply current and control signals See EN 61319-1 4.1.2 Demodulator parameters The demodulator shall be compatible with the ETS 300 421. 4.2 Cable QAM-receiver If EN 50083-7 contains values for
30、cable related parameters mentioned in this section, the values of EN 50083-7 take precedence. 4.2.1 RF-parameters Input frequency range 47 MHz to 862 MHz. Restriction to the range 108 MHz to 862 MHz is recommended, due to better receiver performance Nominal input impedance 75V (female, IEC 60169-2)
31、RF-channel bandwidth 8 MHz (optional 7 MHz) RF-channel table It is recommended to use the existing channel rasters used on analogue cable TV networks RF-loop through RF-loop-through should be provided for the connection of other equipment such as another receiver or VCR. Frequency range 47 MHz to 86
32、2 MHz. Output connector type IEC 60169-2 male. The signal shall be present at the output connector independently of the operational status of the receiver The remainder of this section is based on 64 QAM The level of a PAL or SECAM signal is defined as the power level at the peak of the envelope. Th
33、e power of a digital signal is defined as the average power level. Both can be expressed as dB(mV) across 75V. The back-off between the levels of the PAL or SECAM signal and the digital signal directly influences various parameters. A value of 10 dB is often used; however, experiments in SECAM envir
34、onments resulted in an optimum value of 8 dB. In the following, a value of 10 dB is provisionally considered. Input level range 47 dB(mV) to 67 dB(mV) Adjacent channel requirements Adjacent channel reception in PAL or SECAM or digital environment is possible. The level of the adjacent digital channe
35、l can be 3 dB higher and the level of the adjacent analogue channel can be 13 dB higher than the level of the wanted digital channel (This specification will be superseded if an appropriate amendment of EN 55020 is accepted) NOTE In the case of a back-off value of 10 dB, the carrier-to-noise ratio f
36、or digital signals in cable systems according to EN 50083-7, is 31 dB minimum (noise in 8 MHz bandwidth). Noise figure Under consideration Return loss Under consideration 4.2.2 Demodulator parameters The demodulator shall be compatible with ETS 300 429. 4.3 Terrestrial COFDM receiver This section is
37、 under consideration. 5 MPEG-2, systems, video and audio decoding The functionality of the receiver/decoder shall be compliant with ETR 154. 6 Functions and interfaces (See also EN 50201.) The application of the interfaces is optional. 6.1 Interaction channel 6.1.1 Internal telephone modem Standards
38、 V21 (300 bps), V22bis (2 400 bps), or V23 (1 200/75 bps) Dialling DTM or pulse Connector RJ-45, 6-pinPage 5 EN 50256:1998 BSI 1998 6.1.2 Cable modem Under consideration. A cable modem interface provides a bi-directional data channel. The cable modem interface shall be combined with the QAM tuner in
39、put. 6.2 RF-modulator output In the case of a cable receiver, the modulator output should be combined with the RF-output. Type of connector IEC 60169-2, male for RF-output, 75V Output channel Depends on local circumstances. UHF ch 21 69 is recommended Output level See EN 55013 6.3 Video/audio connec
40、tors Video signal output can be either baseband, in RGB, Y/C (S-VHS) or CVBS format, or modulated on a RF-carrier (see 6.2). Matching values for analogue baseband video signals are 1 Vpp. For detailed specifications, see EN 50049-1 and EN 50157. It is recommended that peritelevision connectors for b
41、oth TV and VCR are provided. In addition to this, a third peritelevision connector for, e.g., an additional analogue satellite receiver can be applied. Audio signals can be either analogue or optionally in digital format. Matching values 0,5 V to 2 V; see EN 50049-1 for analogue audio signals on per
42、itelevision connectors, and EN 61938 for other audio signals. Digital audio signals shall be compliant with EN 60958. Video/peritelevision connectors TV, VCR, satellite Output signals RGB (TV), CVBS (TV, VCR) Input signals (from e.g. analogue satellite receiver at the third peritelevision connector)
43、 RGB, CVBS Audio connectors Peritelevision + 23 phono Digital audio output EN 60958 6.4 Low speed data port Standard RS-232 (DTE) Connector 9-pin D, male shell and female contacts Maximum baud rate 19,2 kBaud 6.5 Digital interface (for audio, video and data) Type of interface IEEE 1394 Speed range T
44、BD (Details of this interface are at this moment defined by IEC/SC 100C in draft IEC 61883.) 7 Conditional access interface This interface is specified in EN 50221.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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