BS-7537-1-1991 IEC-61055-1-1991.pdf
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1、BRITISH STANDARD BS 7537-1: 1991 IEC 1055-1: 1991 Measurement techniques and operational adjustments of broadcast VTRs Part 1: Guide to operational adjustments on analogue composite broadcast VTRs Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:40:16 GMT+00:0
2、0 2006, Uncontrolled Copy, (c) BSI BS 7537-1:1991 This British Standard, having been prepared under the direction of the Electronic Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 29 November 1991 BSI 10-1999 The following BSI r
3、eferences relate to the work on this standard: Committee reference EEL/22 Draft for comment 88/32443 DC ISBN 0 580 20288 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technic
4、al Committee EEL/22, upon which the following bodies were represented: Association of Professional Recording Services Ltd. Audio Engineering Society British Broadcasting Corporation British Kinematograph, Sound and Television Society British Tape Industry Association Independent Broadcasting Authori
5、ty Independent Television Association National Council for Educational Technology (NCET) Royal Photographic Society Royal Television Society Sound and Communication Industries Federation Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London Sout
6、h Bank University, Fri Dec 08 12:40:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7537-1:1991 BSI 10-1999i Contents Page Committees responsibleInside front cover National forewordii Section 0. General 0.1Scope1 Section 1. Operational alignment of transverse-track VTRs 1.1EBU alignment tape1 1.2Al
7、ignment of the playback chain1 1.3Alignment of the record chain4 1.4Mechanical adjustments of headwheels6 Section 2. Operational alignment of B format VTRs 2.1Alignment tapes for B format7 2.2Alignment of the playback chain7 2.3Alignment of the record chain9 2.4Operational mechanical adjustments10 S
8、ection 3. Operational alignment of C format VTRs 3.1Alignment tapes for C format10 3.2Alignment of the playback chain10 3.3Alignment of the record chain12 3.4Operational mechanical adjustments13 Section 4. Operational adjustments on U-matic H television tape-machines 4.1General considerations13 4.2A
9、lignment of the playback chain13 4.3Alignment of the record chain14 4.4Mechanical adjustments14 Annex A (informative) Care of alignment tapes15 Annex B (informative) Bibliography16 Figure 1 Signals recorded on the EBU alignment tape2 Figure 2 Field-rate display of the signal from the alignment tape4
10、 Figure 3 Expanded control track waveform display5 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:40:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7537-1:1991 ii BSI 10-1999 National foreword This Part of BS 753
11、7 has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is identical with IEC 1055-1:1991 “Measurement techniques and operational adjustments of broadcast VTRs Part 1: Operational adjustments on analogue composite broadcast VTRs”, published by the Internati
12、onal Electrotechnical Commission (IEC). This British Standard describes the operational alignment procedures which are peculiar to the types of VTRs used in television production and which are recommended for adoption within the European Broadcasting Union (EBU). It is important for these machines t
13、o be aligned according to clearly defined criteria so that recorded tapes will conform to the standards and to avoid compatibility problems during international programme exchanges. These recommendations were based on the results of investigations conducted by EBU Sub-group G2 (Television tape recor
14、ding) and were published by the EBU in document Tech. 3219-2 “Operational alignment procedures”. Section 1, concerning transverse track VTRs, comprises the corresponding passages of EBU document Tech. 3219 (1976) suitably updated. Sections 2 and 3 are concerned with B format and C format VTRs using
15、25.4 mm tape. Section 4 is concerned with U-matic H format using 19 mm tape. This type of format is not recommended for international exchanges, but it is in widespread use for ENG. NOTETypographical error. In 1.2.4, the first paragraph following Figure 2, the second word “cntrols” should be read as
16、 “controls”. Copies of EBU documents may be purchased from the Technical Centre of the European Broadcasting Union, Cas Postale 67, CH-1218 Grand-Saconnex, Geneva, Switzerland. Telephone + 4122 717 2111 Telefax + 4122 798 5897. A British Standard does not purport to include all the necessary provisi
17、ons 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 front cover, an inside front cover, pages i and ii, pages 1 to 16, an
18、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 Copy: London South Bank University, London South Bank University, Fri Dec 08 12:40:16 GM
19、T+00:00 2006, Uncontrolled Copy, (c) BSI BS 7537-1:1991 BSI 10-19991 Section 0. General 0.1 Scope This technical report defines operational adjustments on analogue composite broadcast VTRs. Section 1. Operational alignment of transverse-track VTRs 1.1 EBU alignment tape The purpose of the alignment
20、tape is to make the checking of the machine as easy as possible and, to this end, a split picture was chosen so that a multiple check could be made on picture and waveform monitor displays. The waveforms of the signals before recording are depicted in Figure 1. The upper half of the picture consists
21、 of the CCIR insertion signal, as specified for line 330, repeated on each line: luminance bar, 2T sine-squared pulse and 5-riser luminance staircase with superimposed sub-carrier. The lower half of the picture consists of a 100/0/75/0 colour-bar signal1). The sound track carries alternating French
22、and English announcements interrupted by 1 000 Hz tone at the reference level of 100 nWb/m r.m.s. There is no recording on the cue track. The tape used is Scotch 400 with average characteristics. It is supplied in rather long sections and it is anticipated that broadcasting organizations will cut th
23、em into short pieces for alignment purposes and will perhaps splice short lengths of their normal video tape stock onto these (see clause 1.3). The complete EBU specifications of the alignment tape for transverse track VTRs appear in EBU document Tech. 3084 12). Alignment tapes have a limited operat
24、ional life and shall be handled with extreme care if they are to provide faithful alignment of VTRs for long periods. Guidance on their use and storage will be found in Annex A. Strict adherence to the manufacturers handling procedures is essential. 1.2 Alignment of the playback chain The objective
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