1、 IEC 61606-4 Edition 1.0 2005-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 4: Personal computer Equipement audio et audiovisuel Parties audio numriques Mthodes de mesure de base des caractri
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16、c.ch. IEC 61606-4 Edition 1.0 2005-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 4: Personal computer Equipement audio et audiovisuel Parties audio numriques Mthodes de mesure de base des car
17、actristiques audio Partie 4: Ordinateur personnel INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE V ICS 35.020; 33.160.30 PRICE CODE CODE PRIX ISBN 978-2-88912-903-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commissi
18、on Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 61606-4 IEC:2005 CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3
19、Terms, definitions and abbreviated terms . 6 3.1 Terms and definitions 6 3.2 Abbreviated terms . 8 3.3 Rated values . 8 4 Measuring conditions 8 4.1 Environmental conditions 8 4.2 Power supplies 8 4.3 Test signal frequencies . 9 4.4 Standard setting 10 4.5 Working setting . 11 4.6 Preconditioning .
20、12 5 Measuring instruments . 12 5.1 Analogue signal generator . 12 5.2 Analogue in-band level meter 12 5.3 Analogue low-pass filter 12 5.4 Analogue weighting filter . 12 5.5 Standard medium 12 5.6 Recording medium 13 5.7 Software for digital data evaluation 13 5.8 Short-term distortion meter 14 5.9
21、Other instruments 14 6 Methods of measurement (digital-in/analogue-out) . 14 6.1 Input/output characteristics . 15 6.2 Frequency response 16 6.3 Noise characteristics . 17 6.4 Distortion characteristics . 21 7 Methods of measurement (analogue-in/digital-out) . 23 7.1 Input/output characteristics . 2
22、3 7.2 Frequency response 25 7.3 Noise characteristics . 26 7.4 Distortion characteristics . 29 Figure 1 Block diagram for maximum output amplitude measurement 15 Figure 2 Block diagram for gain difference between channels measurement 16 Figure 3 Block diagram for frequency-response measurement . 16
23、Figure 4 Block diagram for signal-to-noise ratio measurement . 17 Figure 5 Block diagram for dynamic range measurement . 18 Figure 6 Block diagram for channel separation measurement. 20 Figure 7 Block diagram for distortion and noise measurement 21 Figure 8 Block diagram for short-term distortion me
24、asurement . 22 Figure 9 Block diagram for maximum allowable input amplitude measurement . 23 61606-4 IEC:2005 3 Figure 10 Block diagram for gain difference between channel and tracking error measurement 24 Figure 11 Block diagram for frequency response measurement 25 Figure 12 Block diagram for sign
25、al-to-noise ratio measurement . 26 Figure 13 Block diagram for dynamic range measurement . 27 Figure 14 Block diagram for channel separation measurement . 28 Figure 15 Block diagram for distortion and noise measurement 29 Figure 16 Block diagram for short-term distortion measurement . 30 Table 1 Fre
26、quencies used in the measurement 9 4 61606-4 IEC:2005 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ AUDIO AND AUDIOVISUAL EQUIPMENT DIGITAL AUDIO PARTS BASIC MEASUREMENT METHODS OF AUDIO CHARACTERISTICS Part 4: Personal computer FOREWORD 1) The International Electrotechnical Commission (IEC) is a worl
27、dwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other a
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36、ed publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. Internati
37、onal Standard IEC 61606-4 has been prepared by IEC technical committee 100: Audio, video and multimedia equipment and systems. This bilingual version (2012-05) corresponds to the monolingual English version, published in 2005-12. The text of this standard is based on the following documents: CDV Rep
38、ort on voting 100/952/CDV 100/1030/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. 61606-4 IEC:2005 5 The French version of this standard has not been voted upon. This publication has been drafted in accordance w
39、ith the ISO/IEC Directives, Part 2. IEC 61606 consists of the following parts under the general title Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics: Part 1: General Part 2: Consumer use Part 3: Professional use 1Part 4: Personal computer The c
40、ommittee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a
41、revised edition, or amended. 1Under consideration. 6 61606-4 IEC:2005 AUDIO AND AUDIOVISUAL EQUIPMENT DIGITAL AUDIO PARTS BASIC MEASUREMENT METHODS OF AUDIO CHARACTERISTICS Part 4: Personal computer 1 Scope This part of IEC 61606 specifies the basic measurement methods of a linear PCM signal for an
42、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 measurement for PCs are given in this standard. NOTE 1 The methods described are mostly based on sam
43、pling 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 digital output. Digital input data are provided from an internal HDD or other memory media and output d
44、igital 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 data loss or to 1-bit signals. This part does not apply to analogue input with analogue output and
45、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 audio data. This standard applies only to the measurement in which input/output data are recorded/rep
46、roduced 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 standard. 2 Normative references The following referenced documents are indispensable for the applicat
47、ion 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 standard voltages IEC 60268-2, Sound system equipment Part 2: Explanation of general terms and calculat
48、ion 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 parts Basic measurement methods of audio characteristics Part 2: Consumer use IEC 61672-1, Electr
49、oacoustics 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, as well as the following, apply. 61606-4 IEC:2005 7 3.1.1 personal computer PC personal computer which is designed to be used by one person at a time NOTE 1 A
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