1、BRITISH STANDARD BS6288-10: 1989 IEC94-10: 1988 Incorporating Amendment No.1 Magnetic tape sound recording and reproducing systems Part10: Specification for time and address codes (Implementation of CENELECHD311.10 S1) UDC 681.846.7.083.84+621.377.623.222BS6288-10:1989 This BritishStandard, having b
2、een prepared under the directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Board of BSI and comes into effect on 31August1989 BSI12-1999 The following BSI references relate to the work on this standard: Committee reference EEL/22 Draft announced i
3、n BSI News July1988 ISBN 0 580 17375 5 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/22, upon which the following bodies were represented: British Broadca
4、sting Corporation British Kinematograph, Sound and Television Society Council for Educational Technology for the United Kingdom Electronic Engineering Association Sound and Communication Industries Federation The following bodies were also represented in the drafting of the standard, through subcomm
5、ittees and panels: Association of Professional Recording Studios Audio Engineering Society British Tape Industry Association Royal Photographic Society Amendments issued since publication Amd. No. Date of issue Comments 6405 August1991 Indicated by a sideline in the marginBS6288-10:1989 BSI 12-1999
6、i Contents Page Committees responsible Inside front cover National foreword ii Section 1. General 1 Scope 1 Section 2. Time and control code (IEC publication461) for6.3mm wide twin track audio tape 2 General test conditions 1 3 Track configuration and mode of recording 1 3.1 Track pattern on tape 1
7、3.2 Mode of recording 1 3.3 Time correlation between time code and audio recording 1 3.4 Levels 1 3.5 Shape of the recorded pulses 1 4 Requirements for equipment for recording and reproducing the time code 1 4.1 Cross-talk 1 4.2 Inputs and outputs 1 Section 3. Address codes 5 Recommendation for paus
8、es within programmes 2 Figure 1 Shape of the recorded time code pulses 2 Figure 2 Two track, two channel, unidirectional stereophonic recording with central time code track for professional use 3 Publications referred to Inside back coverBS6288-10:1989 ii BSI 12-1999 National foreword This Part of B
9、S6288 was prepared under the direction of the Electronic Equipment Standards Policy Committee and is identical with Publication94-10:1988 “Magnetic tape sound recording and reproducing systems” Part10 “Time and address codes”, published by the International Electrotechnical Commission (IEC). This Br
10、itishStandard is also in agreement with Harmonization Document HD311.10 S1, published by the European Committee for Electrotechnical Standardization (CENELEC). BS6288 consists of the following Parts: Part1: Specification for general conditions and requirements; Part2: Specification for calibration t
11、apes; Part3: Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape; Part4: Methods for measuring the mechanical characteristics of magnetic tape for analogue recording; Part5: Specification for electrical magnetic tape properties; Part6: Specifica
12、tion for reel-to-reel systems; Part7: Specification for cassettes for commercial tape records and domestic use; Part8: Specification for eight-track magnetic tape cartridge for commercial tape records and domestic use; Part9: Specification for magnetic tape cartridge for professional use; Part10: Sp
13、ecification for time and address codes; Part11: Guide for an address code for compact cassettes. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a BritishStandard without deviation. Some terminology and certain conventions are not
14、identical with those used in BritishStandards; attention is drawn especially to the following. The comma has been used as a decimal marker in the figures. InBritishStandards it is current practice to use a full point on the baseline as the decimal marker. Cross-references International Standard Corr
15、esponding BritishStandard BS6288 Magnetic tape sound recording and reproducing systems IEC94-1:1981 Part1:1982 Specification for general conditions and requirements (Identical) IEC94-3:1979 Part3:1990 Methods of measuring the characteristics of recording and reproducing equipment for sound on magnet
16、ic tape (Identical) IEC94-6:1985 Part6:1987 Specification for reel-to-reel systems (Identical) IEC268-1:1985 BS6840 Sound system equipment Part1:1987 Methods for specifying and measuring general characteristics used for equipment performance (Identical) IEC461:1986 BS6865:1987 Specification for time
17、 control codes for video tape recorders (Identical)BS6288-10:1989 BSI 12-1999 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
18、 confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to4, 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
19、in the amendment table on the inside front cover.iv blankBS6288-10:1989 BSI 12-1999 1 Section 1. General 1 Scope Section2 applies to a time reference(80bit time code according to IEC Publication461) located on a track half-way between the two audio tracks of a6.3mm wide professional twin track magne
20、tic tape for use at a tape speed of19cm/s or38cm/s. Section3 applies to an address code in the form of intentional pauses within a programme for the automatic recognition of individual parts of the programme. Section 2. Time and control code (IECpublication461) for6.3mm wide twin track audio tape 2
21、General test conditions The characteristics of the equipment shall be measured under the following conditions: at rated mains voltage; at rated mains frequency; ambient temperature between15 C and35 C; relative humidity between45% and75%; at86kPa to106kPa atmospheric pressure; after at least10min op
22、eration. NOTESee also Clause8 of IEC Publication94-3. 3 Track configuration and mode of recording Recorded audio signals shall comply with the requirements applicable to professional use, as specified in IEC Publication94-1. 3.1 Track pattern on tape The track pattern is defined in Figure 2. The pat
23、tern of the audio tracks shall conform to that used for two track, two channel, unidirectional stereophonic recording (see Sub-clause14.1.3 and Figure7 of IECPublication94-6). 3.2 Mode of recording The time code, according to IEC Publication461, shall be recorded in the longitudinal direction of the
24、 tape by means of magnetic head gaps adjusted perpendicular to the direction of the tape movement. 3.3 Time correlation between time code and audio recording The start of each80bit time code frame recorded on the time code track shall coincide with each related audio event recorded on the audio trac
25、ks. 3.4 Levels The peak-to-peak value of the time code recording shall be63dB below the peak-to-peak maximum audio level. Recommended levels: 3.5 Shape of the recorded pulses See Figure 1. The rise time and decay time of the recorded flux measured between10% and90% of the maximum flux shall be 504s.
26、 The overshoots shall not exceed5%. These measurements shall be made by means of a reproducing chain with a time constant of04s. 4 Requirements for equipment for recording and reproducing the time code Equipment shall comply with the requirements forprofessional use, as specified in IECPublications9
27、4-1 and94-6. The time code track shall comply with Figure 2. It is recommended that bias be applied during time track code recording. 4.1 Cross-talk In order to ensure inaudibility of the time code on both audio channels, the level of cross-talk on each audio track from the time code track shall be8
28、0dB or more below the maximum audio level. Cross-talk attenuation from each audio track to the time code track shall be25dB or more in the frequency range from40Hz to16kHz. NOTEIf, in accordance with Sub-clause3.4, the time code level is6dB below the maximum audio level, cross-talk components may be
29、 measured via a specified selective filter. 4.2 Inputs and outputs Input and output characteristics should preferably be as follows: Maximum audio level: 514nWb/m r.m.s., sine(1454nWb/m peak-to-peak). Time code level: 729nWb/m, peak-to-peak. Level: from1V to4V peak-to-peak, balanced, ungrounded Inpu
30、t: impedance W 50007 fixed socket connector IEC SR3SL (XLR) according to IEC Publication130-XY (inpreparation) Output: impedance u 407 fixed pin connector to IEC SR3PL (XLR) according to IEC Publication130-XY (inpreparation) +15 10BS6288-10:1989 2 BSI 12-1999 Section 3. Address codes 5 Recommendatio
31、n for pauses within programmes Pauses intended for the automatic recognition of individual parts of a programme should have a minimum duration of4s. The noise level within each such pause should be40dB or more below the reference level of the relevant calibration tape. NOTEThe noise level may be mea
32、sured by means of the wideband filter specified in Clause6 of IEC Publication268-1. Figure 1 Shape of the recorded time code pulsesBS 6288-10:1989 BSI 12-1999 3 Figure 2 Two track, two channel, unidirectional stereophonic recording with central time code track for professional use4 blankBS6288-10:19
33、89 BSI 12-1999 Publications referred to See national foreword.BS6288-10: 1989 IEC94-10: 1988 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at
34、the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and serv
35、ices. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual
36、 updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders
37、 for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library a
38、nd its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments
39、 and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of th
40、e international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from B
41、SI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
