EN 61079-5-1993 en Methods of Measurement on Receivers for Satellite Broadcast Transmissions in the 12 GHz Band Part 5 Electrical Measurements on Decoder Units for MAC Packet Syste.pdf

1、CENELEC EN*blO39-5 93 I 3404583 0159244 344 BRITISH STANDARD Methods of measurement on receivers for satellite broadcast transmissions in the BS EN 12 GHz band Part 5. Electrical measurements on decoder units for MAC/packet systems The European Standard EN 61079-5 : 1993 has the status of a British

2、Standard UDC 621.396.722 : 621.317.08 : 620.1 61079-5 : 1995 IEC 1079-5 : 1993 L CENELEC EN*bL079-5 93 H 3404583 0359245 280 Amd. No. Date O BSI 1995 BS EN 61079-5 : 1995 Rxt affected Cornmittees responsible for this British Standard The preparation of this British Standard was entrusted to Echnical

3、 Committee EPL/12, Radio communication, upon which the following bodies were represented: British Broadcasting Corporation British Educational Equipment Association British Radio and Electronic Equipment Manufacturers Association British Rlecommunications plc Consumers Association Institution of Ele

4、ctrical Engineers International Consumer Electronics Association Radio, Electrical and Television Retailers Association Radiocommunications Agency The foliowing BSI references relate to the work on this standard : Committee reference EPLlZ Special announcement in BSI News April 1995 ISBN O 580 24391

5、 5 CENELEC EN*b1079-5 93 I 3404583 0359246 117 BS EN 61079-5 : 1995 Contents Committees responsible National foreword Page Inside front cover ii Foreword Text of EN 61079-5 2 3 i CENELEC EN*b3079-5 93 m 3404583 0357247 053 m BS EN 61079-5 : 1995 National foreword This part of BS EN 61079 has been pr

6、epared by Technical Committee EPL/12 and is the English language version of EN 61079-5 : 1993 Methods of measurement on receivers for satellite broadcast transmissions in the 12 GHx band Part 5: Electrical masurements on decoder units for MAC/packet systems, published by the European Committee for E

7、lectrotechnical Standardization (CENELEC). It is identical with IEC 1079-5 : 1993, published by the International Electrotechnical Commission (IEC) . BS EN 61079 is a multipart standard. The other Parts published to date are: Part 1 : 1995 Part 2 : 1995 Part 3 ; 1995 Radio-frequency measurements on

8、outdoor units Electrical measurements on DBS tuner units Electrical measurements of overall performance of receiver systems comprising an outdoor unit and a DBS tuner unit This Part of BS EN 61079 defines the conditions and methods of measurement to be applied to MAC/packet decoder units. The unit c

9、an 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. Cross-references Publication referred to Corresponding British Standard BS 3549 Methods of measuring and expressing the performance of television rece

10、ivers Part 1 : 1979 General considerations and electrical measurements other than those at audio-frequencies Part 2 : 1981 Electrical and acoustic measurements at audio- frequencies IEC 107-1 : 1977 IEC 107-2 : 1980 Compliance with a British Standard does not of itself confer immunity from legal obl

11、igations. ii CENELEC EN*blO79-5 93 W 3404583 0159248 T9T EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61079-5 September 1993 UDC 621.396.722 : 621.317.08 : 620.1 Descriptors: Radiocommunications, satellite broadcasting, receivers, decoders, measurements, electric measurements English version

12、 Methods of measurement on receivers for satellite broadcast transmissions in the 12 GHz band Part 5: Electrical measurements on decoder units for MAC/packet systems (IEC 1079-5 : 1993) Mthodes de mesure sur les rcepteurs dmissions de radiodiffusion par satellite dans la bande 12 GHz Partie 5: Mesur

13、es lectriques sur les dcodeurs pour les systmes MAC/paquet MeBverfahren fr Empfnger fr Satelliten-Rundfunkbertragung im 12-GHz-Bereich -il 5: Elektrische Messungen an Dekordern fr MAC/Paket-Systeme (CE1 1079-5 : 1993) (IEC 1079-5 1993) This European Standard was approved by CENELEC on 1993-03-09. CE

14、NELEC members are bound to comply with the CENZENELEC 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

15、application 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 Sec

16、retariat has the same status as the official versions. CENELEC members 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. CENEL

17、EC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1993 Copyright reserved to CENELEC members Ref. No. EN 61079-5 : 1993 E CENELEC ENkbL

18、tI77-5 93 3404583 0159249 926 Page 2 EN 61079-5 : 1993 Foreword The text of document 12A(C0)169, as prepared by Subcommittee 12A, Receiving equipment, of IEC %chnical Committee 12, Radiocommunications, was submitted to the IEC-CENELEC parailel vote in April 1992. The reference document was approved

19、by CENELEC as EN 61079-5 on 9 March 1993. The following dates were fixed: - latest date of publication of an identical national standard (dop) 1994-07-01 - latest date of withdrawal of conflicting national standards (dow) 1994-07-01 Annexes designated normative are part of the body of the standard.

20、Annexes designated informative are given only for information. In this standard, annexes A and ZA are normative and annex B is informative. CENELEC EN*bLR?9-5 93 3404583 0359250 648 Page 3 EN 61079-5 : 1993 CONTENTS Clause SECTION 1: GENERAL 1 . 1 1.2 2.1 3.1 3.2 3.3 3.4 3.5 3.6 4.1 4.2 Scope and ob

21、ject . Normative references SECTION 2: GENERAL EXPLANATION OF TERMS MAC/packet decoder unit . SECTION 3: GENERAL NOTES ON MEASUREMENTS General conditions Setting of the decoder Reference signals Standard measuring conditions . Measuring instruments . Video, audio and digital test signals . SECTION 4

22、: VIDEO SIGNAL MEASUREMENTS Video signal distortion 4.1.1 4.1 -2 4.1 -3 4.1.4 4.1.5 4.1.6 4.1.7 4.1 .a Amplitude versus frequency response Group delay characteristics Automatic amplitude and phase measurements within the video band Pulse response Bar signai response Linearity Response to a ramp sign

23、al in the case of scrambled/descrambied signals . Low-f requency distortion Unwanted signals 4.2.1 Signal-to-noise in nominal conditions . 4.2.2 Suppression of energy dispersal signal 4.2.3 Spectrum aliasing 5 5 6 7 7 8 10 10 10 12 12 13 13 15 16 17 17 19 19 19 20 21 CENELEC EN463079-5 93 I 3404583

24、0359253 584 = Page 4 EN 61079-5 : 1993 4.3 4.4 4.5 4.6 5.1 5.2 5.3 6.1 6.2 6.3 6.4 6.5 6.6 Time domain demultiplexing 22 4.3.2 Delay between luminance and chrominance channels . 22 4.3.3 Relative delays of R.G. B signals 23 4.3.1 Accuracy of colour decoding 22 Noise sensitivity . 24 4.4.1 24 Video o

25、utput signal-to-noise ratio versus input signal-to-noise ratio 4.4.2 Clamp efficiency in the presence of noise 25 26 Conformity of composite synchronization signal . Miscellaneous video measurements 27 SECTION 5: DATA RECOVERY Clock recovery in the presence of noise . 27 Bit error rate due to random

26、 noise . 28 28 Audio-click perceptibility in the presence of noise . SECTION 6: AUDIO MEASUREMENTS Audio-frequency characteristics . 29 Harmonic distortion of audio channels 30 31 Dynamic range of audio channels Audio Crosstalk . 31 Phase difference between left and right channels . 32 Audio signal-

27、to-noise ratio 33 Figures 34 Annexes A (normative) Analytical description 67 B (informative) Bibliography . 74 ZA (normative) Other international publications quoted in this standard with the 75 references of the relevant European publications . CENELEC EN*bl1077-5 93 3404583 0359252 410 W Page 5 EN

28、 61079-5 : 1993 METHODS OF MEASUREMENT ON RECEIVERS FOR SATELLITE BROADCAST TRANSMISSIONS IN THE 12 GHz BAND Part 5: Electrical measurements on decoder units for MAClpacket systems Section 1 : General 1.1 Scope and object The object of this part of IEC 1079 is to define the conditions and methods of

29、 measure- ment 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 or be a part of it. The methods of measurement concerning

30、the DBS tuner part are described in part 2 of IEC 1079. The input signal is a baseband video signal encoded according to one of the following MAC standards: - D-MAC/packet; - O2 MAC/packet. The output signals are: - red, green, blue colour signals (R.G,B); - one or more audio signal(s); - the compos

31、ite synchronization signal. NOTE - The methods of measurement can also be used for MAC/packet receivers with built-in MAC decoder units if R.G,B output signais are available. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitu

32、te provisions of this part of IEC 1079. 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 IEC 1079 are encouraged to investigate the possibility of applying the most recent

33、editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 107-1 : 1977, Recommended methods of measurement on receivers for television broadcast transmissions - Patt 7 : General considerations. Electrical measuremen

34、ts other than those at audio frequencies CENELEC EN*bL079-5 93 3404583 0159253 357 Page 6 EN 61079-5 : 1993 IEC 107-2: 1980, Recommended methods of measurement on receivers for television broad- cast transmissions - Part 2: Electrical and acoustic measurements at audio frequencies I EC 1 07-3: 1 988

35、, Recommended methods of measurement on receivers for television broadcast transmissions - Part 3: Electrical measurements on multichannel sound tele- vision receivers using subcarrier systems IEC 107-4: 1988, Recommended methods of measurement on receivers for television broadcast transmissions - P

36、art 4: Electrical measurements on multichannel sound tele- vision receivers using the two-carrier FM system IEC 107-5: 1992, Recommended methods of measurement on receivers for television broadcast transmissions - Part 5: Electrical measurements on multichannel sound televi- sion receivers using the

37、 NICAM two-channel digital sound system IEC 107-6: 1989, Recommended methods of measurement on receivers for television broadcast transmissions - Part 6: Measurement under conditions different from broadcast signal standards IEC 933-1 : 1988, Audio, video and audiovisual systems - Interconnections a

38、nd matching values. Part 1: 21-pin connector for video systems - Application No. 1. Section 2: General explanation of terms For the purpose of this pari of IEC 1079, the following general definitions apply. 2.1 MAC/packet decoder unit The function of this unit is to process an incoming baseband vide

39、o MAC signal issued from a DBS tuner unit 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 appro- priate audiovideo connector such as the one defined by IEC 933-1. The exact configuration of the uni

40、t depends on overall product design and 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. CENELEC EN*bL079-5 93 34

41、04583 0359254 293 Page 7 EN 61079-5 : 1993 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 measurement reliability. 3.1.2 Test site Measurement shall be carried out at a locat

42、ion that is not subject to external radio fre- quency interference. If interference cannot be avoided, the tests shall be carried out in a screened room. 3.1.3 Environmental conditions Sections three, four and five of IEC 107-1 shall be applied. 3.1.4 Power supply A power supply equivalent to the ra

43、ted voltage and rated frequency of the unit shall be used. The fluctuation of the power supply voltage and frequency during the tests shall not exceed i2 % and harmonic components of the power supply shall not exceed 5 %. 3.1.5 Accuracy of measuring instruments The accuracy of the measuring instrume

44、nts used, if known, shall either be stated as a percentage or in decibels, as appropriate. Alternatively, the precision class may be quoted as stated in the relevant publications. 3.1 . Stabilization period Unless otherwise specified, measurements should be started at the time that stabilization of

45、the characteristics is obtained. 3.2 Setting of the decoder Unless otherwise specified, ail adjustments of the decoder should be set to nominal (for video and audio parts). Special care should be taken concerning saturation and contrast settings. They can be checked using the colour-bar test signal

46、and observing that R,G,B output colour signals are as close as possible to those shown in figure 17. CENELEC EN*bL79-5 93 3404583 0359255 32T W Page 8 EN 61079-5 : 1993 3.3 Video, audio and digltai test signals 3.3.1 Video fest signals Most video measurements are performed on one of the outgoing R,G

47、,B colour signals which are derived from both luminance and chrominance components. In order to easily determine the characteristics of each processing channel, the video test signals exist in two forms: - one for the luminance channel testing (referred to as “L“) where the test signal is included i

48、n the luminance part of the line; - one for the chrominance (referred to as “Ch“) where the test signal is included in the chrominance part of the video line. a) Multiburst L and Ch signals. b) Complex wobbulation L and Ch signals (real part). c) Complex wobbulation L and Ch signais (imaginary part)

49、. d) Modulated pulses signal L and Ch signals. e) Pulse and bar L and Ch signals. f) Rising ramp L and Ch signals. g) Eight-riser staircase L and Ch signals. h) 50 Yo grey level signal. i) 75 o/o colour-bar signal. j) Bow-tie signal (even line), bow-tie signal (odd line). k) Low frequency black to white transition signai Examples are shown in figure 2, but complete signal description is provided in the annex A. NOTES 1 from -0.5 V to +0.5 V as follows: The nominal dynamic range of the MAC video is 1 V. In this text, signals will be described as rangi