1、BRITISH STANDARDBS EN 61606-4:2006Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 4: Personal computer The European Standard EN 61606-4:2006 has the status of a British StandardICS 35.020; 33.160.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g4
2、3g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Thu Apr 12 06:25:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 61606-4:2006This British Standard was publish
3、ed under the authority of the Standards Policy and Strategy Committee on 28 February 2007 BSI 2007ISBN 978 0 580 50167 8National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61606-4:2006. It is identical with IEC 61606-4:2005.The UK participation in its prepa
4、ration was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment.A list of organizations represented on EPL/100 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are respons
5、ible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Thu Apr 12 06:25:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 61606-4 NORME EUR
6、OPENNE EUROPISCHE NORM December 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation i
7、n any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61606-4:2006 E ICS 35.020; 33.160.30 English version Audio and audiovisual equipment - Digital audio parts - Basic measurement methods of audio characteristics Part 4: Personal computer (IEC 61606-4:2005) Equipements aud
8、io et audiovisuels - Parties audionumriques - Mthodes fondamentales pour la mesure des caractristiques audio Partie 4: Ordinateur personnel (CEI 61606-4:2005) Audio- und Audiovisuelle Gerte - Digitale Tonteile - Grundlegende Messverfahren der Audio-Eigenschaften Teil 4: Personal-Computer (IEC 61606-
9、4:2005) This European Standard was approved by CENELEC on 2006-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliogr
10、aphical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in two official versions (English and German). A version in any other language made by translation under the responsibility of a CEN
11、ELEC 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, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
12、Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, na, Thu Apr 12 06:25:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 61606-4:2006 2 Foreword The t
13、ext of the International Standard IEC 61606-4:2005, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the formal vote and was approved by CENELEC as EN 61606-4 on 2006-12-01 without any modification. The following dates were fixed: latest date by which the E
14、N has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2007-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-12-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of
15、 the International Standard IEC 61606-4:2005 was approved by CENELEC as a European Standard without any modification. _ Licensed Copy: Wang Bin, na, Thu Apr 12 06:25:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 EN 61606-4:2006 CONTENTS 1 Scope 5 2 Normative references .5 3 Terms, definitions and
16、abbreviated terms 5 3.1 Terms and definitions 5 3.2 Abbreviated terms .7 3.3 Rated values .7 4 Measuring conditions7 4.1 Environmental conditions.7 4.2 Power supplies 7 4.3 Test signal frequencies8 4.4 Standard setting 9 4.5 Working setting10 4.6 Preconditioning11 5 Measuring instruments11 5.1 Analo
17、gue signal generator .11 5.2 Analogue in-band level meter.11 5.3 Analogue low-pass filter.11 5.4 Analogue weighting filter11 5.5 Standard medium 11 5.6 Recording medium.12 5.7 Software for digital data evaluation 12 5.8 Short-term distortion meter 13 5.9 Other instruments13 6 Methods of measurement
18、(digital-in/analogue-out) 13 6.1 Input/output characteristics 14 6.2 Frequency response 15 6.3 Noise characteristics .16 6.4 Distortion characteristics20 7 Methods of measurement (analogue-in/digital-out) 22 7.1 Input/output characteristics 22 7.2 Frequency response 24 7.3 Noise characteristics .25
19、7.4 Distortion characteristics28 Annex ZA (normative) Normative references to international publications with their corresponding European publications31 Figure 1 Block diagram for maximum output amplitude measurement14 Figure 2 Block diagram for gain difference between channels measurement15 Figure
20、 3 Block diagram for frequency-response measurement.15 Figure 4 Block diagram for signal-to-noise ratio measurement 16 Figure 5 Block diagram for dynamic range measurement 17 Figure 6 Block diagram for channel separation measurement19 Figure 7 Block diagram for distortion and noise measurement.20 Fi
21、gure 8 Block diagram for short-term distortion measurement21 Licensed Copy: Wang Bin, na, Thu Apr 12 06:25:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 61606-4:2006 4 Figure 9 Block diagram for maximum allowable input amplitude measurement.22 Figure 10 Block diagram for gain difference between ch
22、annel and tracking error measurement23 Figure 11 Block diagram for frequency response measurement.24 Figure 12 Block diagram for signal-to-noise ratio measurement.25 Figure 13 Block diagram for dynamic range measurement 26 Figure 14 Block diagram for channel separation measurement27 Figure 15 Block
23、diagram for distortion and noise measurement .28 Figure 16 Block diagram for short-term distortion measurement 29 Table 1 Frequencies used in the measurement.8 Licensed Copy: Wang Bin, na, Thu Apr 12 06:25:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 EN 61606-4:2006 Part 4: Personal computer 1 Sc
24、ope This part of IEC 61606 specifies the basic measurement methods of a linear PCM signal for an audio part of personal computers (PCs) and applies to both desktop and portable computers. The common measuring conditions and methods are described in IEC 61606-1. Specific conditions and methods of mea
25、surement for PCs are given in this standard. NOTE 1 The methods described are mostly based on sampling frequencies from 8 kHz to 192 kHz and bit length from 8 bit to 24 bit. NOTE 2 This standard describes tests for equipment which has digital input with analogue output and analogue input with digita
26、l output. Digital input data are provided from an internal HDD or other memory media and output digital data are recorded to an internal HDD or main memories. NOTE 3 The methods specified in this standard are not applicable to systems incorporating bit-rate reduced digital audio signals that have da
27、ta loss or to 1-bit signals. This part does not apply to analogue input with analogue output and digital input with digital output as described in IEC 61606-1. NOTE 4 When a CPU in a PC is overloaded by tasks other than those for audio input/output, the PC may fail to record/reproduce the whole audi
28、o data. This standard applies only to the measurement in which input/output data are recorded/reproduced without such missing data. The performance of a PC with missing audio data may be evaluated by the short-term distortion measurement although such evaluation is not within the scope of this stand
29、ard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60038, IEC standa
30、rd voltages IEC 60268-2, Sound system equipment Part 2: Explanation of general terms and calculation methods IEC 61606-1, Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 1: General IEC 61606-2, Audio and audiovisual equipment Digital audio
31、parts Basic measurement methods of audio characteristics Part 2: Consumer use IEC 61672-1, Electroacoustics Sound level meters Part 1: Specifications 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 61606-1
32、, as well as the following, apply. AUDIO AND AUDIOVISUAL EQUIPMENT DIGITAL AUDIO PARTS BASIC MEASUREMENT METHODS OF AUDIO CHARACTERISTICS Licensed Copy: Wang Bin, na, Thu Apr 12 06:25:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 61606-4:2006 6 3.1.1 personal computer PC personal computer which is
33、 designed to be used by one person at a time NOTE 1 A PC does not include optional sound cards or any board or drive installed by the user after purchase. NOTE 2 A PC may be used by more than one person when it is used with network computers. 3.1.2 standard input signal amplitude input analogue sign
34、al amplitude which corresponds to the digital full-scale level: analogue input terminal: 2 V r.m.s. microphone terminal: 100 mV r.m.s. 3.1.3 standard output signal amplitude output analogue signal amplitude which corresponds to the digital full-scale level: analogue output terminal: 2 V r.m.s. NOTE
35、If the EUT cannot output the amplitude of 2 V r.m.s., 1 V r.m.s. may be used for the measurement. In that case, measured data should be indicated with the measured voltage. headphone terminal: maximum output amplitude 3.1.4 normal measuring amplitude analogue signal amplitude equal to 1/10 of the st
36、andard input signal amplitude 3.1.5 normal source impedance impedance which is connected to the analogue input terminals of the EUT: analogue input terminal: 2,2 k microphone terminal: 600 3.1.6 normal load impedance load impedance which is connected to the output terminals of the EUT: load of analo
37、gue output terminal: 22 k load of headphone terminal: 32 load of speaker terminals: 8 or equal to the impedance of internal speakers 3.1.7 factory setting default setting of EUT as defined by the manufacturer 3.1.8 standard medium internal storage medium which provides digital test data at the stand
38、ard setting and should be a hard disk drive (HDD) working on the EUT NOTE If the EUT is not equipped with a HDD, another memory medium which is used as a main memory may be used. In this case, it should be stated with the results. 3.1.9 recording medium internal data storage medium on which audio pl
39、ayback data are recorded for the analogue-in/digital-out measurement and should be a hard disk drive (HDD) NOTE If the EUT is not equipped with a HDD, another memory medium which is used as a main memory may be used. Licensed Copy: Wang Bin, na, Thu Apr 12 06:25:33 GMT+00:00 2007, Uncontrolled Copy,
40、 (c) BSI 7 EN 61606-4:2006 3.1.10 working medium internal storage medium from which digital test data are provided at the working setting NOTE This medium should be a main data source when audio signal is played on the EUT, such as a compact disc (CD). 3.2 Abbreviated terms EUT equipment under test,
41、 which is a PC in this standard AC alternating current r.m.s. root-mean square LPCM linear pulse code modulation LSB least significant bit 3.3 Rated values For a full explanation of these terms, see IEC 60268-2. The following are rated conditions for digital audio equipment which should be specified
42、 by the manufacturer: rated supply voltage; rated supply frequency; rated digital input word length; rated sampling frequency(ies). 4 Measuring conditions 4.1 Environmental conditions The following environmental conditions with the indicated tolerances shall be used: air pressure: 96 kPa 10 kPa ambi
43、ent temperature: 15 C to 35 C relative humidity: (60 15) % 4.2 Power supplies An a.c. power supply or a battery shall be used. If a battery is used, it should be stated with the results. 4.2.1 Supply voltage Rated a.c. power supply voltage, as specified in IEC 60038, shall be used. The tolerance of
44、the supply voltage should be 10 % or less. 4.2.2 Frequency(ies) AC power supply frequency(ies) specified by the manufacturer shall be used. The tolerance of the frequency should be +2 %, 4 % or less. 4.2.3 Noises at the power supply output Noises at the power supply output should be less than the am
45、plitude which affects the result of measurement. Licensed Copy: Wang Bin, na, Thu Apr 12 06:25:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 61606-4:2006 8 4.2.4 Battery Only the battery designed for the EUT or built in the EUT shall be used. 4.3 Test signal frequencies The frequency of the test s
46、ignal shall be selected from the values in Table 1. In catalogues and other documents, where precision is not required or implied in the description, it is permitted to use the nominal values shown in this table. Unless otherwise specified, the reference frequency for measurements shall be 997 Hz, w
47、hich may be stated in non-critical contexts, as 1 kHz. Table 1 Frequencies used in the measurement Dimensions in HzActual frequency Nominal frequency fs= 8 000 fs= 11 025 fs= 16 000 fs= 22 050 fs= 32 000 fs= 44 100 fs= 48 000 fs= 88 200 fs= 96 000 fs= 192 000 4 4 4 4 4 4 4 4 4 4 4 8 7 7 7 7 7 7 7 7
48、7 7 16 17 17 17 17 17 17 17 17 17 17 32 31 31 31 31 31 31 31 31 31 31 63 61 61 61 61 61 61 61 61 61 61 125 127 127 127 127 127 127 127 127 127 127 250 251 251 251 251 251 251 251 251 251 251 500 499 499 499 499 499 499 499 499 499 499 1 000 997 997 997 997 997 997 997 997 997 997 2 000 1 999 1 999 1
49、 999 1 999 1 999 1 999 1 999 1 999 1 999 1 999 3 700 3 677 4 000 4 001 4 001 4 001 4 001 4 001 4 001 4 001 4 001 4 001 5 100 5059 5059 7 400 7 351 8 000 7 993 7 993 7 993 7 993 7 993 7 993 7 993 10 000 10 007 10 007 10 007 10 007 10 007 10 007 10 100 10 141 12 500 12 503 12 503 12 503 14 700 14 717 14 717 14 717
