1、BRITISH STANDARD BS EN 61079-5:1995 IEC 1079-5: 1993 Methods of measurement on receivers for satellite broadcast transmissions in the12GHz band Part5: Electrical measurements on decoder units for MAC/packet systems The European Standard EN61079-5:1993 has the status of a BritishStandard UDC 621.396.
2、722:621.317.08:620.1BSEN61079-5:1995 This BritishStandard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authorityof the Standards Boardand comesintoeffect on 15 August1995 BSI 03-2000 The following BSI references relate to the work on this stan
3、dard: Committee reference EPL/12 Special announcement in BSINews April1995 ISBN 0 580 24391 5 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted to Technical Committee EPL/12, Radio communication, upon which the following bodies were represented: Br
4、itish Broadcasting Corporation British Educational Equipment Association British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Consumers Association Institution of Electrical Engineers International Consumer Electronics Association Radio, Electrical and Tele
5、vision Retailers Association Radiocommunications Agency Amendments issued since publication Amd. No. Date CommentsBSEN61079-5:1995 BSI 03-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN61079-5 5 List of references Inside back coverBSEN61079-5
6、:1995 ii BSI 03-2000 National foreword This Part of BS EN61079 has been prepared by Technical Committee EPL/12 and is the English language version of EN61079-5:1993 Methods of measurement on receivers for satellite broadcast transmissions in the12GHz band Part5:Electrical measurements on decoder uni
7、ts for MAC/packet systems, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC1079-5:1993, published by the International Electrotechnical Commission (IEC). BS EN61079 is a multipart standard. The other Parts published to date are: Part1:1995
8、Radio-frequency measurements on outdoor units; Part2:1995 Electrical measurements on DBS tuner units; Part3:1995 Electrical measurements of overall performance of receiver systems comprising an outdoor unit and a DBS tuner unit. This Part of BS EN61079 defines the conditions and methods of measureme
9、nt to be applied to MAC/packet decoder units. The unit can either be connected to the output of a DBS tuner unit or be a part of it. Limit values of the various parameters of the decoder are not specified. A British Standard does not purport to include all the necessary provisions of a contract. Use
10、rs of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding BritishStandard BS3549 Methods of measuring and expressing the performance of te
11、levision receivers IEC107-1:1977 Part1:1979 General considerations and electrical measurements other than those at audio-frequencies IEC107-2:1980 Part2:1981 Electrical and acoustic measurements at audio-frequencies Summary of pages This document comprises a front cover, an inside front cover, pages
12、i andii, theEN title page, pages2 to60, 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN610
13、79-5 September1993 UDC 621.396.722:621.317.08:620.1 Descriptors: Radiocommunications, satellite broadcasting, receivers, decoders, measurements, electric measurements English version Methods of measurement on receivers for satellite broadcasttransmissions in the12GHz band Part5:Electrical measuremen
14、ts on decoder units for MAC/packet systems (IEC1079-5:1993) Mthodes de mesure sur les rcepteurs dmissions de radiodiffusion par satellite dansla bande12GHz Partie5: Mesures lectriques sur les dcodeurspour les systmes MAC/paquet (CEI1079-5:1993) Meverfahren fr Empfnger fr Satelliten-Rundfunkbertragun
15、g im 12-GHz-Bereich Teil5: Elektrische Messungen an Dekordern fr MAC/Paket-Systeme (IEC1079-5:1993) This European Standard was approved by CENELEC on1993-03-09. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Stand
16、ard 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. This European Standard exists in three official versions (English, Fren
17、ch, 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 members are the national electrotechnical committees of Austria, Belgium,
18、Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrot
19、echnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN61079-5:1993 EEN61079-5:1993 BSI 03-2000 2 Foreword The text of document12A(CO)169, as prepared by Subcommittee12A, Receiving equipment, of IEC Technical Committee12, Radi
20、ocommunications, was submitted to the IEC-CENELEC parallel vote in April1992. The reference document was approved by CENELEC as EN61079-5 on9March1993. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given only
21、 for information. In this standard, Annex A and Annex ZA are normative and Annex B is informative. Contents Page Foreword 2 Section 1. General 1.1 Scope and object 5 1.2 Normative references 5 Section 2. General explanation of terms 2.1 MAC/packet decoder unit 6 Section 3. General notes on measureme
22、nts 3.1 General conditions 6 3.2 Setting of the decoder 6 3.3 Video, audio and digital test signals 7 3.4 Reference signals 8 3.5 Standard measuring conditions 8 3.6 Measuring instruments 8 Section 4. Video signal measurements 4.1 Video signal distortion 9 4.1.1 Amplitude versus frequency response 9
23、 4.1.2 Group delay characteristics 10 4.1.3 Automatic amplitude and phase measurements within the video band 11 4.1.4 Pulse response 12 4.1.5 Bar signal response 12 4.1.6 Low-frequency distortion 13 4.1.7 Linearity 13 4.1.8 Response to a ramp signal in the case of scrambled/descrambled signals 14 4.
24、2 Unwanted signals 15 4.2.1 Signal-to-noise in nominal conditions 15 4.2.2 Suppression of energy dispersal signal 15 4.2.3 Spectrum aliasing 16 4.3 Time domain demultiplexing 16 4.3.1 Accuracy of colour decoding 16 4.3.2 Delay between luminance and chrominance channels 17 4.3.3 Relative delays of R,
25、 G, B signals 18 4.4 Noise sensitivity 18 4.4.1 Video output signal-to-noise ratio versus input signal-to-noise ratio 18 4.4.2 Clamp efficiency in the presence of noise 19 4.5 Conformity of composite synchronization signal 19 4.6 Miscellaneous video measurements 20 Section 5. Data recovery 5.1 Clock
26、 recovery in the presence of noise 20 latest date of publication ofan identical national standard (dop)1994-07-01 latest date of withdrawal ofconflicting national standards (dow)1994-07-01EN61079-5:1993 BSI 03-2000 3 Page 5.2 Bit error rate due to random noise 21 5.3 Audio-click perceptibility in th
27、e presence of noise 21 Section 6. Audio measurements 6.1 Audio-frequency characteristics 22 6.2 Harmonic distortion of audio channels 22 6.3 Dynamic range of audio channels 23 6.4 Audio crosstalk 23 6.5 Phase difference between left and right channels 24 6.6 Audio signal-to-noise ratio 24 Annex A (n
28、ormative) Analytical description 55 Annex B (informative) Bibliography 60 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 60 Figure 1 Notional block diagram of MAC decoder 25 Figure 2 Examples of MAC test signals
29、 26 Figure 2a Multiburst luminance signal 26 Figure 2a Multiburst chrominance signal 26 Figure 2b Complex wobbulation luminance signal (real part) 27 Figure 2b Complex wobbulation chrominance signal (real part) 27 Figure 2c Complex wobbulation luminance signal (imaginary part) 28 Figure 2c Complex w
30、obbulation chrominance signal (imaginary part) 28 Figure 2d Modulated pulses luminance signal 29 Figure 2d Modulated pulses chrominance signal 29 Figure 2e Pulse and bar luminance signal 30 Figure 2e Pulse and bar chrominance signal 30 Figure 2f Rising ramp chrominance signal (even line) 31 Figure 2
31、f Rising ramp chrominance signal (odd line) 31 Figure 2f Rising ramp luminance signal 32 Figure 2g Eight-riser staircase luminance signal 32 Figure 2g Eight-riser staircase chrominance signal (even line) 33 Figure 2g Eight-riser staircase chrominance signal (odd line) 33 Page Figure 2h 50 % grey-lev
32、el signal 34 Figure 2i 75 % colour-bar signals (even line) 35 Figure 2i 75 % colour-bar signals (odd line) 35 Figure 2j Bow-tie test signal (even line) 36 Figure 2j Bow-tie test signal (odd line) 36 Figure 2j Resulting decoded R colour signal 36 Figure 3 Audio pre-emphasis 37 Figure 4 Definition of
33、full-scale amplitude and reference amplitude 38 Figure 5 Basic test arrangement 39 Figure 6 Circuit arrangement for videobandwidth measurements using a MAClineinserter 40 Figure 7 Rosman nomogram 41 Figure 8 Circuit arrangement for automatic measurement acquisition and processing 42 Figure 9 Pulse r
34、esponse and transition measurements 42 Figure 10 Bar tilt measurement 43 Figure 11 Low-frequency distortions measurement 43 Figure 12 Example of signal obtained after differentiation (five-riser staircase) 43 Figure 13 Example of derivative filters 44 Figure 14 Circuit arrangement for ramp signal re
35、sponse in case of scrambling/descrambling transmission 45 Figure 15 Circuit arrangement for energy dispersal removal measurement 46 Figure 16 Circuit arrangement for spectrum aliasing measurements using a MAC line inserter 47 Figure 17 Decoded colour-bar signals 48 Figure 18 Accuracy of colour decod
36、ing 49 Figure 19 Luminance to chrominance relative delay measurement 50 Figure 20 Circuit arrangement for video noise sensitivity and clamp efficiency 50 Figure 21 Clock recovery versus noise 51 Figure 22 BER measurement 51 Figure 23 Audio-click perceptibility 52 Figure 24 Audio-frequency response 5
37、2 Figure 25 Harmonic distortion 53EN61079-5:1993 BSI 03-2000 4 Page Figure 26 Sound dynamic range 53 Figure 27 Audio crosstalk 53 Figure 28 Phase amplitude differences L/R 54 Figure 29 Audio signal-to-noise ratio 54EN61079-5:1993 BSI 03-2000 5 Section 1. General 1.1 Scope and object The object of th
38、is part of IEC1079 is to define the conditions and methods of measurement to be applied to MAC/packet decoder units. The specifications of the limit values of the various parameters of the decoder are outside the scope of this part. This unit can either be connected to the output of a DBS tuner unit
39、 or be a part of it. The methods of measurement concerning the DBS tuner part are described in part2 of IEC1079. The input signal is a baseband video signal encoded according to one of the following MAC standards: D-MAC/packet; D2 MAC/packet. The output signals are: red, green, blue colour signals (
40、R, G, B); one or more audio signal(s); the composite synchronization signal. NOTEThe methods of measurement can also be used for MAC/packet receivers with built-in MAC decoder units if R, G, B output signals are available. 1.2 Normative references The following normative documents contain provisions
41、 which, through reference in this text, constitute provisions of this part of IEC1079. At the time of publication of this standard, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC1079 are encouraged to investigat
42、e the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC107-1:1977, Recommended methods of measurement on receivers for television broadcast transmissions Part1: Genera
43、l considerations. Electrical measurements other than those at audio frequencies. IEC107-2:1980, Recommended methods of measurement on receivers for television broadcast transmissions Part2: Electrical and acoustic measurements at audio frequencies. IEC107-3:1988, Recommended methods of measurement o
44、n receivers for television broadcast transmissions Part3: Electrical measurements on multichannel sound television receivers using subcarrier systems. IEC107-4:1988, Recommended methods of measurement on receivers for television broadcast transmissions Part4: Electrical measurements on multichannel
45、sound television receivers using the two-carrier FM system. IEC107-5:1992, Recommended methods of measurement on receivers for television broadcast transmissions Part5: Electrical measurements on multichannel sound television receivers using the NICAM two-channel digital sound system. IEC107-6:1989,
46、 Recommended methods of measurement on receivers for television broadcast transmissions Part6: Measurement under conditions different from broadcast signal standards. IEC933-1:1988, Audio, video and audiovisual systems Interconnections and matching values. Part1: 21-pin connector for video systems A
47、pplication No.1. EN61079-5:1993 6 BSI 03-2000 Section 2. General explanation of terms For the purpose of this part of IEC1079, the following general definitions apply. 2.1 MAC/packet decoder unit The function of this unit is to process an incoming baseband video MAC signal issued from a DBS tuner un
48、it and to decode it in order to provide R, G, B colour, audio and composite synchronization signals which can be applied to a monitor or a TV set having an appropriate audiovideo connector such as the one defined by IEC933-1. The exact configuration of the unit depends on overall product design and
49、the related type of MAC/packet system that the equipment is designed to process. In the description of the measurement methods, it is assumed that the arrangement of the units is similar to the notional block diagram shown in Figure 1. Section 3. General notes on measurements 3.1 General conditions 3.1.1 Introduction Measurements should be carried out in accordance with the following conditions to ensure measurem
