BS 6840-9-1987 Sound system equipment - Methods for specifying and measuring the characteristics of artificial reverberation time delay and frequency shift equipment《音响系统设备 第9部分 模拟.pdf
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1、BRITISH STANDARD BS 6840-9: 1987 IEC 268-9: 1977 Sound system equipment Part 9: Methods for specifying and measuring the characteristics of artificial reverberation, time delay and frequency shift equipment IEC title: Sound system equipment Part 9: Artificial reverberation, time delay and frequency
2、shift equipment UDC 621.396+681.84:621.395.61:621.317.6BS6840-9:1987 This British Standard, having been prepared under the directionof the Electronic Equipment Standards Committee,was published underthe authority of the BoardofBSI and comes into effecton 30November1987 BSI 07-1999 The following BSI
3、references relate to the work on this standard: Committee reference EEL/32 Draft for comment 75/26725 DC ISBN 0 580 16222 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Committee (EEL/-) to Technical Com
4、mittee EEL/32, upon which the following bodies were represented: Association of British Theatre Technicians Association of Sound and Communications Engineers Limited Audio Engineering Society British Educational Equipment Association British Kinematograph, Sound and Television Society British Radio
5、and Electronic Equipment Manufacturers Association British Telecommunications plc Cable Television Association of Great Britain Consumer Standards Advisory Committee of BSI Consumers Association Federation of British Audio Independent Television Companies Association Institution of Electronic and Ra
6、dio Engineers Radio Electrical and Television Retailers Association Royal Institute of British Architects Royal National Institute for the Deaf Society of Cable Television Engineers Training and Educational Systems Testing Bureau Amendments issued since publication Amd. No. Date of issue CommentsBS6
7、840-9:1987 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword iii 1 Scope 1 2 Object 1 3 Conditions 1 3.1 Conditions for specifications 1 3.2 Rated conditions and normal working conditions 1 3.3 Other conditions 1 4 General 1 4.1 General 1 4.2 General characteriz
8、ation of the devices 1 4.3 Comparison between characteristics of the devices and those of the amplifier 1 Section 1. Artificial reverberation equipment 5 General 2 5.1 Definition of reverberation 2 5.2 Object 2 5.3 General characteristics 2 5.4 Special characteristics 2 6 Reverberation time 2 6.1 Ch
9、aracteristic to be specified 2 7 Various kinds of reverberation time 2 7.1 Initial reverberation time 2 7.2 Ultimate reverberation time 2 7.3 Method of measurement 3 8 Linearity 3 8.1 Characteristic to be specified 3 9 Frequency response 3 9.1 Characteristic to be specified 3 9.2 Method of measureme
10、nt 3 10 Initial time delay 3 10.1 Characteristic to be specified 3 10.2 Method of measurement 3 11 Additional characteristics 3 11.1 General 3 11.2 Ambient acoustical noise 3 11.3 Safe life expectancy 4 Section 2. Time delay devices 12 General 4 12.1 Types of devices 4 12.2 General characteristics 4
11、 12.3 Special characteristics 4 13 Delay time 4 13.1 Characteristic to be specified 4 13.2 Method of measurement 4 14 Echo 4 14.1 General 4 15 Echo time 4BS6840-9:1987 ii BSI 07-1999 Page 15.1 Characteristic to be specified 4 16 Ambient acoustical noise 4 17 Safe life expectancy 4 Section 3. Frequen
12、cy shift devices 18 General 5 18.1 General characteristics 5 18.2 Special characteristic 5 18.3 Characteristic to be specified 5 18.4 Method of measurement 5 Publications referred to Inside back coverBS6840-9:1987 BSI 07-1999 iii National foreword This British Standard has been prepared under the di
13、rection of the Electronic Equipment Standards Committee and is identical with Publication268-9:1977 “Sound system equipment” Part 9 “Artificial reverberation, time delay and frequency shift equipment” published by the International Electrotechnical Commission (IEC). The text of this Part of BS6840 i
14、s unchanged from the text of BS5428-8 which is now withdrawn. All Parts and Sections of BS5428 will be published as Parts of BS6840 in order to achieve consistency of numbering between the corresponding Parts of the IECPublication and the British Standard. BS6840 consists of the following Parts: Par
15、t 1: Methods for specifying and measuring general characteristics used for equipment performance (Supersedes part of BS5428-1); Part 2: Specification for general terms and calculation methods (Supersedes part of BS5428-1) 1) ; Part 3: Methods for specifying and measuring the characteristics of sound
16、 system amplifiers (Supersedes BS5428-2) 1) ; Part 4: Methods for specifying and measuring the characteristics of microphones (Previously BS5428-3); Part 5: Methods for specifying and measuring the characteristics of loudspeakers (Supersedes BS5428-11 and BS5428-11:Supplement 1) 1) ; Part 6: Methods
17、 for specifying and measuring the characteristics of auxiliary passive elements (Previously BS5428-4); Part 7: Methods for specifying and measuring the characteristics of headphones and headsets (New) 1) ; Part 8: Methods for specifying and measuring the characteristics of automatic gain control dev
18、ices (Previously BS5428-7); Part 9: Methods for specifying and measuring the characteristics of artificial reverberation, time delay and frequency shift equipment (Previously BS5428-8); Part 10: Specification for programme level meters (Supersedes BS5428-9) 1) ; Part 11: Specification for applicatio
19、n of connectors for the interconnection of sound system components (Supersedes BS5428-5.2) 1) ; Part 12: Specification for application of connectors for broadcast and similar use (Supersedes BS5428-5.3) 1) ; Part 13: Guide for listening tests on loudspeakers (New); Part 14: Guide for circular and el
20、liptical loudspeakers: outer frame diameters and mounting dimensions (Previously BS5428-5.1); Part 15: Specification for matching values for the interconnection of sound system components (Supersedes BS5428-10) 1) ; Part 16: Guide to the RASTI method for the objective rating of speech intelligibilit
21、y in auditoria (New) 1) . 1) In preparation.BS6840-9:1987 iv BSI 07-1999 Terminology and conventions. The text of the international standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those us
22、ed in British Standards; attention is drawn especially to the following. IEC94-4, referred to in the text as being in preparation, has now been published as IEC94-4:1986, and BS6288-4 is in preparation as a British Standard identical to it. A British Standard does not purport to include all the nece
23、ssary 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. Cross-references International standard Corresponding British Standard IEC225:1966 BS2475:1964 Speci
24、fication for octave and one-third octave band-pass filters (Technically equivalent) IEC 268-1:1985 BS6840 Sound system equipment Part 1:1987 Methods for specifying and measuring general characteristics used for equipment performance (Identical) BS5428 Methods for specifying and measuring the charact
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