1、BRITISH STANDARD BS EN 61041-3:1995 BS 7434-3: 1994 IEC 1041-3: 1993 Incorporating Amendment No. 1 Non-broadcast video tape recorders Methods of measurement Part 3: Audio characteristics for FMrecording The European Standard EN 61041-3:1995 has the status of a British Standard ICS 33.160.40BSEN 6104
2、1-3:1995 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes into effect on 15 December 1994 BSI 04-2000 The following BSI references relate to the work on this standard: Committee refe
3、rence EEL22 Draft for comment 88/25852 DC ISBN 0 580 23469 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electrotechnical Sector Board to Technical Committee EEL/22, upon which the following bodies were represented: Association of Pr
4、ofessional Recording Services Ltd. Audio Engineering Society British Broadcasting Corporation British Kinematograph, Sound and Television Society British Tape Industry Association Federation of the Electronics Industry Independent Television Association National Council for Educational Technology (N
5、CET) Royal Photographic Society Royal Television Society Amendments issued since publication Amd. No. Date Comments 8933 December 1995 Indicated by a sideline in the marginBSEN 61041-3:1995 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Section
6、1. General 1.1 Scope 3 1.2 Normative references 3 1.3 Test conditions 3 Section 2. Audio characteristics 2.1 Amplitude/frequency response 3 2.2 Signal-to-noise ratio (AGC off) 4 2.3 Signal-to-noise ratio (AGC on) 4 2.4 Dynamic range (AGC off) 5 2.5 Dynamic range (AGC on) 5 2.6 Harmonic distortion 5
7、2.7 Channel crosstalk 5 2.8 Channel separation 6 2.9 AGC operation and attack/recovery time 6 2.10 Switching noise 7 2.11 Wow and flutter 7 Section 3. Calibration tape 3.1 General 7 3.2 Magnetic tape 7 3.3 Recording audio signal 7 3.4 Recording video signal 8 3.5 Presentation 8 Annex A (informative)
8、 Bibliography 17 Annex ZA (normative) Normative references to international publications with their corresponding European publications 18 Figure 1 Circuit arrangement: Amplitude/frequency response 8 Figure 2 Circuit arrangement: Signal-to-noise ratio AGC off; Dynamic range 8 Figure 3 Circuit arrang
9、ement: Signal-to-noise ratio AGC on 9 Figure 4 Circuit arrangement: Harmonic distortion 10 Figure 5 Circuit arrangement: Channel crosstalk AGC off; Channel separation AGC off 10 Figure 6 Circuit arrangement: Channel crosstalk AGC on; Channel separation AGC on 10 Figure 7 Crosstalk of channel L from
10、channel R 11 Figure 8 Crosstalk of channel R from channel L 12 Figure 9 Circuit arrangement: AGC operation; Hold time 12 Figure 10 Gain curve (out/in response) 13 Figure 11 Test signal for attack/recovery time measurement 13 Figure 12 Output signal (attack transient) 14 Figure 13 Circuit arrangement
11、: Switching noise 14 Figure 14 Low-pass filter characteristics 15 Figure 15 Input level and audio FM deviation (modulation depth) for various VTR systems 16 List of references Inside back coverBSEN 61041-3:1995 ii BSI 04-2000 National foreword This Part of BS 7434 has been prepared under the directi
12、on of the Electrotechnical Sector Board. It is identical with IEC 1041-3:1993 Non-broadcast video tape recorders Methods of measurement Part 3: Audio characteristics for FM recording, published by the International Electrotechnical Commission (IEC). In 1995 the European Committee for Electrotechnica
13、l Standardization (CENELEC) accepted IEC 1041-3:1993 as European Standard EN 61041-3:1995. As a consequence of implementing the European Standard, this British Standard is renumbered as BS EN 61041-3 and any reference to BS 7434-3 should be read as a reference to BS EN 61041-3. The original number B
14、S 7434-3 has been retained as a secondary identifier. The Technical Committee has reviewed the provisions of IEC 1053-2:1991, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this British Standard. Cross-references International S
15、tandard Corresponding British Standard IEC 94-3:1979 BS 6288 Magnetic tape sound recording and reproducing systems Part 3:1990 Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape BS 6840 Sound system equipment IEC 268-1:1985 Part 1:1987 Methods
16、for specifying and measuring general characteristics used for equipment performance IEC 268-3:1988 Part 3:1992 Methods for specifying and measuring the characteristics of sound system amplifiers IEC 268-8:1973 Part 8:1988 Methods for specifying and measuring the characteristics of automatic gain con
17、trol devices IEC 386:1972 BS 4847:1989 Method of measurement of speed fluctuations in sound recording and reproducing equipment IEC 574-4:1982 BS 5817 Specification for audiovisual, video and television equipment and systems Part 4:1989 Specification for matching values for the interconnection of eq
18、uipment in a system IEC 843:1987 BS 7065:1989 Specification for helical-scan video tape cassette system using 8 mm magnetic tape: Video 8 IEC 1053-1:1991 BS 7486 Specification for helical-scan video tape cassette system using 12.65 mm (0.5 in) magnetic tape on type Beta format. FM audio recording Pa
19、rt 1:1991 625 line-50 field systems IEC 1054:1991 BS EN 61054:1993 aHelical-scan video tape cassette system using 12.65 mm (0.5 in) magnetic tape on type VHS. FM audio recording a Previously BS 7487:1991. BS 7487:1991 was renumbered as BS EN 61054:1993 by amendment 1 to BS 7487:1991.BSEN 61041-3:199
20、5 BSI 04-2000 iii 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 d
21、ocument comprises a front cover, an inside front cover, pages i to iv, theENtitle page, pages 2 to 18, 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 fron
22、t cover.iv blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61041-3 July 1995 ICS 33.160.40 Descriptors: Recording apparatus, video tape recorder, measurements, sound recording, frequency modulation, high fidelity systems, noise reduction, testing conditions, recording characteristics, stan
23、dard measures English version Non-broadcast videotape recorders Methods of measurement Part 3: Audio characteristics for FM recording (IEC1041-3:1993) Magntoscopes hors radiodiffusion Mthodes de mesure Partie 3: Caractristiques audio pour lenregistrement MF (CEI 1041-3:1993) Videobandgerte fr den Ge
24、brauch auerhalb des Rundfunks Meverfahren Teil 3: Ton-Eigenschaften bei FM-Aufzeignung (IEC 1041-3:1993) This European Standard was approved by CENELEC on 1995-05-15. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
25、 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. This European Standard exists in three official versions (English
26、, 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 members are the national electrotechnical committees of Austria, Bel
27、gium, 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 Europen de Normalisation Electrotechnique Europisches Komitee fr E
28、lektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC members Ref. No. EN 61041-3:1995 EEN61041-3:1995 2 BSI 04-2000 Foreword The text of the International Standard IEC 1041-3:1993, prepared by SC 60B, Video recording, of IEC TC 60, Reco
29、rding, was submitted to the formal vote and was approved by CENELEC as EN 61041-3 on 1995-05-15 without any modification. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this stan
30、dard, Annex ZA is normative and Annex A is informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 1041-3:1993 was approved by CENELEC as a European Standard without any modification. In the official version, for Annex A, Bibliography, the follo
31、wing notes have to be added for the standards indicated: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1996-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (d
32、ow) 1996-07-01 IEC 268-2 NOTEHarmonized, together with its amendment 1:1991, as HD 483.2 S2:1993 (notmodified). IEC 767 NOTEHarmonized as HD 461 S1:1987 (notmodified). IEC 774 NOTEHarmonized as HD 463 S1:1987, which is superseded by EN 60774-1:1994 (notmodified). IEC 1041-1 NOTEHarmonized as EN 6104
33、1-1:1995 (notmodified).EN61041-3:1995 BSI 04-2000 3 Section 1. General 1.1 Scope This part of IEC 1041 concerns the measurement of overall characteristics of the FM audio recorded using slanted tracks similar to those used for recording of the video information. The main characteristics of such a re
34、cording system are: two channels, high fidelity and the use of companders for noise reduction. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 1041. At the time of publication, the editions
35、 indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 1041 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of
36、 currently valid International Standards. IEC 94-3:1979, Magnetic tape sound recording and reproducing systems Part 3: Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape. Amendment No. 2 (1988) IEC 268-1:1985, Sound system equipment Part1:Gener
37、al. IEC 268-3:1988, Sound system equipment Part3:Amplifiers. IEC 268-8:1973, Sound system equipment Part8:Automatic gain control devices. IEC 386:1972, Method of measurement of speed fluctuations in sound recording and reproducing equipment. IEC 574-4:1982, Audio-visual, video and television equipme
38、nt and systems Part 4: Preferred matching values for the interconnection of equipment in a system. IEC 843:1987, Helical-scan video tape cassette system using 8 mm magnetic tape Video 8. IEC 1053-1:1991, Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type beta forma
39、t FM audio recording Part1:625 lines 50 field systems. IEC 1053-2:1991, Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type beta format FM audio recording Part2:525 lines 60 field systems. IEC 1054:1991, Helical-scan video tape cassette system using 12,65 mm (0,5 in
40、) magnetic tape on type VHS FM audio recording. 1.3 Test conditions 1.3.1 The FM audio signal and the video FM signal shall be recorded simultaneously. 1.3.2 The video signal applied to the videotape recorder shall be a 100/0/75/0 colour bars one with an amplitude of 1 Vpp. 1.3.3 For the determinati
41、on of the reference input level a specified calibration tape (see 3.1) is required, a section on which a sine wave of 400 Hz is recorded using a frequency deviation as defined in the relevant standard for the VTR system to which the equipment under test belongs (see note below). The reference record
42、ing frequency deviation shall be determined by the following procedures. 1.3.3.1 If adjustable record gain controls are provided on the equipment, they shall be adjusted at preset middle position. The input level applied to the VTR shall be adjusted so that the output voltages V oderived from record
43、ing and reproducing are the same as the output voltages V cderived from reproducing a section of the specified calibration tape described above. 1.3.3.2 If adjustable record gain controls are not provided on the equipment, the input level shall be adjusted so that the output voltages V oderived from
44、 recording and reproducing are the same as the output voltages V cderived from reproducing a section of the specified calibration tape described above. 1.3.4 The peak recording level corresponds to 100% modulation depth (frequency deviation according to the relevant specification). 1.3.5 The input l
45、evel required for the 0 VU indication is different for each VTR system. 1.3.6 The audio characteristics shall be measured at each tape speed specified for the VTR under test. NOTEThe reference input level corresponds to the following modulation depth: 33% for beta and VHS systems according to IEC 10
46、53-1, 1053-2 and 1054. 60% for 8 mm video system according to IEC 843. Figure 15 shows the above-mentioned parameters in comparison. Section 2. Audio characteristics 2.1 Amplitude/frequency response 2.1.1 This measurement determines the maximum deviation of overall characteristics from flat response
47、 within a specified frequency range. 2.1.2 The circuit arrangement shall be as shown in Figure 1.EN61041-3:1995 4 BSI 04-2000 2.1.3 The test signal shall be a sine wave of 1000 Hz with a superimposed sine-wave sweep covering the frequency range from 20 Hz to 20 kHz. The input level of the 1000 Hz si
48、ne wave applied to the VTR shall be the reference input level as defined in 1.3.3.1 and 1.3.3.2. The input level of the sine-wave sweep to the VTR shall be 20 dB below the 1000Hz sine-wave input level. 2.1.4 The output playback signal shall be measured by a spectrum analyser disregarding the1000Hz s
49、pectral component. 2.1.5 The amplitude/frequency response within the frequency range of 20 Hz to 20 kHz shall be calculated with respect to the amplitude of 400 Hz. 2.1.6 The presentation of the results, that is the maximum positive and negative differences from the response at 400 Hz, shall be reported in dB for channel L and channel R respectively. Preferably these ratios are to be presented graphically as a function of frequency see 21.1.2 5) of IEC 268-3. 2.2 Signal-to-noise ratio (AGC
