BS 6288-11-1989 Magnetic tape sound recording and reproducing systems - Guide to an address code for compact cassettes《磁带录放系统 第11部分 小型磁带盒地址码指南》.pdf

1、BRITISH STANDARD BS6288-11: 1989 IEC94-11: 1988 Magnetic tape sound recording and reproducing systems Part11: Guide to an address code for compact cassettes UDC 681.846.7BS6288-11:1989 This BritishStandard, having been prepared under the directionof the Electronic Equipment Standards PolicyCommittee

2、, was publishedunderthe authorityofthe BoardofBSI andcomes into effect on 29September1989 BSI12-1999 The following BSI references relate to the work on this standard: Committee reference EEL/22 Draft for comment BSI News July1988 ISBN 0 580 17631 2 Committees responsible for this BritishStandard The

3、 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 Broadcasting Corporation British Kinematograph, Sound and Television Society Council for Educatio

4、nal Technology for the United Kingdom Electronic Engineering Association Independent Broadcasting Authority Independent Television Authority Sound and Communication Industries Federation The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Ass

5、ociation of Professional Recording Studios Audio Engineering Society British Tape Industry Association Royal Photographic Society Amendments issued since publication Amd. No. Date of issue CommentsBS6288-11:1989 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword

6、ii 1 Object 1 2 Features of address code system 1 3 Code 1 3.1 General description 1 3.2 The basic code 1 3.3 Electric signal properties/flux on tape 1 3.4 Positioning of code signal 1 Figure 1 Example of a code signal 2 Figure 2a Address code table 2 Figure 2b Position of the pulses on the tape 3 F

7、igure 3 Tape flux according to Sub-clauses 3.3.3 3 Figure 4 Tape flux according to Sub-clauses 3.3.3 4 Figure 5 Magnetic situation of head during playback 4 Figure 6 Recommended minimum interval to be respected between time-code and audio signal 5 Figure 7 Audio attenuation to be applied underminimu

8、mintervalconditionsof Figure 6 5BS6288-11:1989 ii BSI 12-1999 National foreword This Part of BS6288 has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is identical with IEC94-11:1988 “Magnetic tape sound recording and reproducing systems Part11: Address

9、code for compact cassettes”, published by the International Electrotechnical Commission (IEC). BS6288 consists of the following Parts: Part1: Specification for general conditions and requirements; Part2: Specification for calibration tapes; Part3: Methods of measuring the characteristics of recordin

10、g 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: Specification for reel-to-reel systems; Part7: Specification for cassettes

11、 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: Specification for time and address codes; Part11: Guide to an addre

12、ss code for compact cassettes. IEC94-11 does not give the scope of the standard, which for the purposes of this BritishStandard is as follows: “This Part of BS6288 defines an address code for recording on commercial cassette tape records and compact cassettes which when used with suitable reproducin

13、g equipment will make possible the automatic selection and reproduction of the recorded items.” 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

14、 not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the

15、 amendment table on the inside front cover.BS6288-11:1989 BSI 12-1999 1 1 Object To define an address code to be recorded on commercial cassette tape records and compact cassettes. When used with suitable reproducing equipment, automatic selection of the recorded items and subsequent reproduction is

16、 made possible. 2 Features of address code system Each item is preceded by its own individual code signal. An identification of the A side or B side is given in the code. The code signal does not interfere during playback. The code can be read out at both reproducing and maximum spooling speed. The

17、structure and recording of the code system have been determined in order to practically eliminate any malfunctioning which could be caused by interference of musical signals. The system allows the use of special control codes. This possibility has already been used for an “end of programme” indicati

18、on, which is recorded after the last item on both sides A and B, irrespective of the number of the last item. This enables automatic skipping of the unrecorded part on each side. 3 Code 3.1 General description The fundamental frequency of the code signal is10Hz; it is recorded in antiphase on both t

19、racks. The information in the code signal is carried by amplitude modulation. 3.2 The basic code 3.2.1 A complete signal is composed of13cycles of10Hz. A “1” is represented by one cycle of10Hz. A “0” is represented by the absence of signal during the cycle. Figure 1 shows a typical example of a code

20、 signal; in this case, it represents item number A21. 3.2.2 Figure 2a and Figure 2b show the decoding table together with the position of the pulses on the tape. Position1 of the code is the first pulse of the code signal which is read in the playback mode. 3.2.3 From the70 possible code signals, on

21、ly codes A1 to A30 are used to address items on the tape in the A direction. In the reverse (B) direction, the items are coded B1 to B30. The remaining code numbers, A31 to A35 and B31 to B35, are reserved for special control functions. 3.2.4 Two special numbers are allocated for “end of recording”

22、information: A35 and B35 (see Clause2). 3.2.5 The code numbers A1 and B1 are identical, with the exception of bit4. This provides a simple method of identifying the side. 3.3 Electric signal properties/flux on tape 3.3.1 Frequency The fundamental frequency is10Hz 5%. 3.3.2 Flux When measured with a

23、continuous sinusoidal signal of the fundamental frequency, the r.m.s. flux on the tape is205nWb/m. 3.3.3 Shape The form of the flux distribution of a pulse on the tape can be sinusoidal (see Figure 3), or can be triangular (see Figure 4). 3.3.4 Phasing Figure 5 illustrates the magnetic situation of

24、a record head for the left track when reading an address code signal. The right track is in antiphase. 3.4 Positioning of code signal To ensure trouble-free operation, it is recommended that a time-lapse of at least1.5s be provided between the end of the code signal and the start of the correspondin

25、g item. If, however, an audio signal is present on the tape within the time windows represented by Figure 6, then attenuation shall be applied in accordance with Figure 7. BS6288-11:1989 2 BSI 12-1999 Figure 1 Example of a code signal Address Position Address Position 13 12 11 10 9 8 7 6 5 4 3 2 1 1

26、3 12 11 10 9 8 7 6 5 4 3 2 1 A-1 A-2 A-3 A-4 A-5 A-6 A-7 A-8 A-9 A-10 A-11 A-12 A-13 A-14 A-15 A-16 A-17 A-18 A-19 A-20 A-21 A-22 A-23 A-24 A-25 A-26 A-27 A-28 A-29 A-30 A-31 A-32 A-33 A-34 A-35 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

27、 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1

28、 1 1 0 0 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1

29、 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 B-1 B-2 B-3 B-4 B-5 B-6 B-7 B-8 B-9 B-10 B-11 B-12 B-13 B-14 B-15 B-16 B-17 B-18 B-19 B-20 B-21

30、 B-22 B-23 B-24 B-25 B-26 B-27 B-28 B-29 B-30 B-31 B-32 B-33 B-34 B-35 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 1 0 1 0 1 0 1

31、 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0

32、 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

33、 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Figure 2a Address code tableBS6288-11:1989 BSI 12-1999 3 Figure 2b Position of the pulses on the tape Figure 3 Tape flux according to Sub-clause3.3.3BS6288-11:1989 4 BSI 12-1999 Figure 4 Tape flux according to Sub-claus

34、e3.3.3 Figure 5 Magnetic situation of head during playbackBS6288-11:1989 BSI 12-1999 5 Figure 6 Recommended minimum interval to be respected between time-codeandaudiosignal Figure 7 Audio attenuation to be applied under minimum interval conditions of Figure 6BS6288-11: 1989 IEC94-11: 1988 BSI 389 Ch

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