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、3g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 61606-4:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2007 B
3、SI 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 preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems an
4、d 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 responsible for its correct application.Compliance with a British Standard cannot confer immunity
5、from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 61606-4 NORME EUROPENNE EUROPISCHE NORM December 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotec
6、hnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in 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 p
7、arts - Basic measurement methods of audio characteristics Part 4: Personal computer (IEC 61606-4:2005) Equipements audio et audiovisuels - Parties audionumriques - Mthodes fondamentales pour la mesure des caractristiques audio Partie 4: Ordinateur personnel (CEI 61606-4:2005) Audio- und Audiovisuell
8、e Gerte - Digitale Tonteile - Grundlegende Messverfahren der Audio-Eigenschaften Teil 4: Personal-Computer (IEC 61606-4:2005) 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
9、 giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical 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 officia
10、l versions (English and German). A version in any other language made by translation under the responsibility of a CENELEC 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 o
11、f Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 61
12、606-4:2006 2 Foreword The text 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:
13、 latest date by which the EN 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. _ End
14、orsement notice The text of the International Standard IEC 61606-4:2005 was approved by CENELEC as a European Standard without any modification. _ 3 EN 61606-4:2006 CONTENTS 1 Scope 5 2 Normative references .5 3 Terms, definitions and abbreviated terms 5 3.1 Terms and definitions 5 3.2 Abbreviated t
15、erms .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 Analogue signal generator .11 5.2 Analogue in-band level meter.11 5.3
16、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 (digital-in/analogue-out) 13 6.1 Input/output characteristics 14
17、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 7.4 Distortion characteristics28 Annex ZA (normative) Normative r
18、eferences 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 3 Block diagram for frequency-response measurement.15 Figure 4 B
19、lock 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 Figure 8 Block diagram for short-term distortion measurement21 EN 6
20、1606-4:2006 4 Figure 9 Block diagram for maximum allowable input amplitude measurement.22 Figure 10 Block diagram for gain difference between channel and tracking error measurement23 Figure 11 Block diagram for frequency response measurement.24 Figure 12 Block diagram for signal-to-noise ratio measu
21、rement.25 Figure 13 Block diagram for dynamic range measurement 26 Figure 14 Block diagram for channel separation measurement27 Figure 15 Block diagram for distortion and noise measurement .28 Figure 16 Block diagram for short-term distortion measurement 29 Table 1 Frequencies used in the measuremen
22、t.8 5 EN 61606-4:2006 Part 4: Personal computer 1 Scope 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
23、 IEC 61606-1. Specific conditions and methods of measurement 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
24、 with analogue output and analogue input with digital 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
25、 bit-rate reduced digital audio signals that have data 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
26、, the PC may fail to record/reproduce the whole audio 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 s
27、uch evaluation is not within the scope of this standard. 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 (incl
28、uding any amendments) applies. IEC 60038, IEC standard 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 616
29、06-2, Audio and audiovisual equipment Digital audio 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 docu
30、ment, the terms and definitions given in IEC 61606-1, as well as the following, apply. AUDIO AND AUDIOVISUAL EQUIPMENT DIGITAL AUDIO PARTS BASIC MEASUREMENT METHODS OF AUDIO CHARACTERISTICS EN 61606-4:2006 6 3.1.1 personal computer PC personal computer which is designed to be used by one person at a
31、 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 signal amplitude which corresponds to the d
32、igital 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 If the EUT cannot output the amplitude
33、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 standard input signal amplitude 3.1.5 nor
34、mal 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 analogue output terminal: 22 k load of headp
35、hone 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 standard setting and should be a hard disk d
36、rive (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 playback data are recorded for the analog
37、ue-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. 7 EN 61606-4:2006 3.1.10 working medium internal storage medium from which digital test data are provided at the working s
38、etting 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, which is a PC in this standard AC alternating current r.m.s. root-mean square LPCM linear pulse code modulation LSB least signific
39、ant 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 by the manufacturer: rated supply voltage; rated supply frequency; rated digital input word length; rated sampling frequency(ies).
40、 4 Measuring conditions 4.1 Environmental conditions The following environmental conditions with the indicated tolerances shall be used: air pressure: 96 kPa 10 kPa ambient 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
41、 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 the supply voltage should be 10 % or less. 4.2.2 Frequency(ies) AC power supply frequency(ies) specified by the manufacturer shall
42、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 amplitude which affects the result of measurement. EN 61606-4:2006 8 4.2.4 Battery Only the battery designed for the EUT or built in
43、the EUT shall be used. 4.3 Test signal frequencies The frequency of the test signal 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 ot
44、herwise specified, the reference frequency for measurements shall be 997 Hz, which 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
45、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 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
46、 499 499 499 1 000 997 997 997 997 997 997 997 997 997 997 2 000 1 999 1 999 1 999 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
47、 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 16 000 16 001 16 001 16 001 16 001 16 001 18 000 17 987 17 987 20 000 19 997 19 997 19 997 19 997 20 300 20 269 22 000 22 079 30 000 29 989 29 989 35 000 34 981 34 981 40 000 40 429 40 429 40 429 44 000 44 15
48、9 50 000 49 999 70 000 70 001 80 000 79 999 88 000 88 301 If a sweep signal is used in the measurement, the sweep frequency range is from 16 Hz to 1/2 fs. 9 EN 61606-4:2006 4.4 Standard setting 4.4.1 Standard input condition for the EUT 4.4.1.1 Analogue signal input condition 4.4.1.1.1 Microphone Input Signal amplitude: normal measuring amplitude Source impedance: normal source impedance 4.
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