1、STD-BSI BS EN bLOSb-ENGL 1793 1b24bb7 Ob15042 327 BRITISH STANDARD Methods of measuring the characteristics of reproducing equipment for digital audio compact discs “he Europmn Standard EN 61096 : 1993 has the status of a British Standard ICs 33.160.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PER
2、MITTED BY COPYRIGHT LAW BS EN i1096 : 1993 EC 1096 : 1992 morporating Imendment No. 1 (not rublished sepamtely) STD-BSI BS EN bLOSb-ENGL 1773 Lb24bb7 ObL50Li3 2b5 Standards Board and coilies into Amd, No. Date effect Oll BS EN 61096 : 1993 Issue 2, May 1997 Text af fcc ted Cooperating organizations
3、The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway
4、Portugal Spain Sweden Switzerland United Kingdom 9495 0BSI 1997 1 May1997 1 indicatedbyalineinthemargin I I STD*BSI BS EN bLOSb-ENGL 1773 lb24bb7 Ob15Uqll LTL Issue 1, May 1997 BS EN 61096 : 1993 Summary of pages The following table identifes the current issue of each page. issue 1 indicates that a
5、page has been introduced for the first time by amendment. Subsequent issue numbers indicate an updated page. Vertical sidelining on replacement pages indicates the most recent changes (amendment, addition, deletion). Page Front cover inside front cover b i EN cover 2 3 4 5 5a 5b 6 7 8 8a 5 11 Issue
6、II Page 2 2 1 blank 2 blank 2 2 2 2 1 blank Original Original 2 1 onginai 8b sc 8d 9-18 19 19a 19b 20 21 22 22a 22b 23 24 25 26 Inside back cover Back cover issue 1 1 blank 2 1 blank 2 original Original original 1 1 2 2 2 2 blank 2 O BSI 1997 - a STD-BSI BS EN bLOSb-ENGL 1993 Lb2LibbS ObL50Li5 038 B
7、S EN 61096 : 1993 Issue 2, May 1997 Contents Page Cooperating organizations Inside front cover National foreword i Foreword 2 Text of EN 61096 3 National annex NA (iormative) Cornittees responsible 25 25 I National annex NB (iormative) Cross-references National foreword This British Standard has bee
8、n prepared under the direction of the Electronic Equipment Standards Poiicy Committee and is the English language version of EN 61096 MeuzOds of measuring the chamcteristics of reproducing equipment for I digital a,udio cmpact discs together with its amendment Al : 1996, published by the European Co
9、mmittee for Electrotechnid Standardization (CENELEC). It is I identical with IEC 1096 : 1992 together with its amendment 1 : 1996, published by the International Electrotechnical Commission (IEC). Compliance with a British Standard does not of itself confer immunity from legal obligations. * * rn O
10、BSI 1997 1 STD-BSI BS EN bLO9b-ENGL 1993 PI 1bZLibbS IbLSOLIb T7Li EUROPEAN flmm EN 61096 EUROP - power supply; - interface data. For the guidance of CO player manufacturers, preferred values or ranges are given in square brackets following each parameter listed below: 4.2.1 Environmental conditions
11、 Ambient temperature 20+: OC Relative humidity (60 I 15 % Air pressure (96 f 10 kPa Minimum stabilization time of CD player at ambient temperature after switching on 5 min 4.2.2 Power supply Type of supply(ies) (ag. a.c. or d.c.) Vo It age (s) see IEC 381 Frequency( es) 4.2.3 Interface data 4.2.3.1
12、Fixed analogue output Matching values for interconnections 4.2.3.2 Digital output see IEC 268-15, amendment 21 see IEC 9581 4.2.3.3 Other outputs 4.2.3.4 Test discs The test disc used in the measurement should be chosen from the discs listed in annex A. 4.3 Performance claims Tne perfcrmnce claims s
13、hsl le besed OR the CD player operating under the conditions specified in subclause 4.2. Unless otherwise specified in 4.2.1 or 4.2.2 (for example maximum or minimum values), a tolerance shall be allocated to each parameter. STD-BSI BS EN bLOSb-ENGL 1773 m lbZYbb7 Obl5054 040 m page 8 EN 61096: 1993
14、 Issue 2, May 1997 In case the manufacturer claims power supply voltage tolerances exceeding I10 %, the characteristics to be specified shall also be stated for the upper and lower limits of these tolerances. If variations in the frequency of the power supply, within the tolerances specified by the
15、manufacturer, have any significant influence on the characteristics to be specified, these characteristics shall also be stated for the upper and lower limits of the claimed frequency tolerances. If harmonics in the a.c. power supply or ripple in the d.c. power supply, within the limits specified by
16、 the manufacturer, have any significant influence on the characteristics to be specified, those characteristics shall also be stated for the upper limit of the claimed toler- ances of harmonic or ripple content. 4.3.1 Mechanical performance claims 4.3.1.1 Shock and vibration resistance Definition Th
17、e player insensitivity against direct or indirect mechanical shocks and vibrations as caused by the supporting surface in vertical (2-direction) or in horizontal direction (x and y directions) on the player cabinet. a) Shock test CD player + Oscilloscope test disc Shock table: Oscilloscope: CD playe
18、r: Test signal: Table excitation: Test CD: Mechanical shock table I I +z I /+y Direction of acceleration -Z according to IEC 68-2-27. input A, LF direct; input B LF 90“ out of phase with A; x-deflection via input B. line output, left channel, directly connected to oscilloscope input A. 1 kHz left an
19、d right according to IEC 68-2-27, figure 2: D = 3 ms, A = variable. according to annexes A and C of this standard for restricted CD parameters. O BSI 1997 * * ui Peak acceleration A Sn Equivalent mis2 1 (1 0) 2 (20) 3 (30) 4 (40) 5 (50) 6 (60) STD-BSI BS EN bLOSb-ENGL 1773 Lb24bbS Ob15055 T87 = Issu
20、e I, May 1997 Page 8a EN 61096 : 1993 Corresponding duration Corresponding velocity change for the nominal pulse D AV = 2ix x AD x ms mis 3 0,02 3 0.04 3 0.06 3 0.08 3 o. 1 30 1,o Method CD player+ . test disc Place the player on a board horizontally. Apply shocks with increasing severity and observ
21、e the circle on the scope. Set oscilloscope sensitivity of A and i3 input so that a circle will be displayed. Observe the circle during the shock test run. The distortion of the circle is a measure for the shock influence. It is advised to also listen for audible effects. The test should be repeated
22、 three times in all directions (4-X, +/-Y +/-2) for every severity level. Low-pass Distortion filter meter The following table gives an extension of table 1 of IEC. 68-2-27 with g values applicable for CD equipment. Table 1 - Acceleration and duration of puise Resuit Give for every direction the low
23、est severity level (in gs) resulting in visible distortion of the circle. b) Vibration test Mechanical vibration table +z Direction of aic4ararion -Z O BSI 1997 - STD-BSI BS EN bLOSb-ENGL 1793 W 1b24bb7 Obl505b 713 Page 8b EN 61096 : 1993 Test signals issue 1, May 1997 Test CD (see annexes A and C o
24、f this standard for restricted CD parameters): 400 Hz or 1 kHz preferably, O dB, mono-signal. Acceleration signal: specified noise according to IEC 721 -3-5, table VI: a) stationary vibration, sinusoidal: frequency range 9 Hz - 200 Hz; b) stationary vibration, random: frequency range 10 Hz - 200 Hz.
25、 Duration: 1 min. Method Play the test CD and increase the acceleration intensity every minute up to the point just before the audio sound reproduction is negatively affected by distortion variations. The limit is thus established between complete error correction and the beginning of interpolation.
26、 Result Besides the disturbance direction (horizontal or vertical), the type of acceleration signal, the maximum acceleration amplitude (in meters per second, squared, peak-to-peak) and the related frequency (in hertz) or random noise shall be named. 4.3.1.2 Acoustic noise Definition The noise radia
27、ted by the player mechanism during various modes of application. Such modes are: - disc loading, unloading, disc change action; - search within a track, track search, pause and playback. Test disc Any test disc covered in annexes A and C of this standard which refer to restricted CD parameters. Meth
28、od The measurements should be carried out preferably in an anechoic room in order to minimize the effect of sound reflected by the room surfaces. A room with reverberation time less than 1 s for frequencies higher than 100 Hz will lead to nearly the same results, if the distance between each measuri
29、ng point and the next reflecting surface is at least three times the distance of the same measuring point to the sound source. The ambient noise (noise without object under test) shall be at least 10 dE3 lower than the sound pressure at the measuring point in each frequency band. Test room parameter
30、s shall conform with IS0 3740, IS0 3741, IS0 3742, IS0 3743-1, IS0 3743-2, IS0 3744 and IS0 3745. Place the player on a wooden board of 800 mm x 1200 mm x 20 mm size (depth x width x thickness) supported by a thin anti-slip layer. O BSI 1997 - STD*BSI BS EN bLOSb-ENGL 1793 Lb24bb9 OLL5057 85T Issue
31、1, May 1997 Page 8c EN 61096 : 1993 Position of the microphone Place the microphone at a distance of 1 m in front of each side of the player and measure the A-weighted sound pressure level (see IEC 651). At least for the measuring point with the highest dB(A)-value add a one-third octave spectrum. T
32、his allows the ear-related value to be calculated (see IS0 532) in order to find the correct NR curve (see IS0 1996). Insert the test disc(s) on the loading tray or in the changer box. Measure the player noise level at the named microphone positions and during the defined modes of application. Repea
33、t the measurements at least three times and calculate the arithmetic mean value. Result The one-third octave sound spectrum at the loudest measuring point at a distance of 1 m to the player surface. The noise level per test mode or at least for the highest average noise level should be stated in dB(
34、A), sones or NR. 4.3.2 Electrical performance claims Units For methods of measurement, see subclauses: VA, W 5.1 4.3.2.1 General performance Maximum power consumption 4.3.2.2 Reproducing performance Reference output voltage v Channel unbalance at 1 kHz dB Cross-talk dB Frequency response d Frequency
35、 response with de-emphasis dB Idle channel signal-to-noise (S/N) dB Active channel signal-to-noise dB Distortion and noise d Intermodulation distortion dB or % Frequency error % Phase difference between channels degree 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5 -9 5.1 O 5.1 1 5.12 O BSI 1997 Page 9 EN 61096 : 19
36、93 STD*BSI BS EN bLOSb-ENGL 1973 m Lb24bb7 Ob15058 77b m Level non-linearity Output polarity Access times 4.4 Additional considerations dB 5.1 3 5.1 4 S 5.15 4.4.1 Unless otherwise statel. in the subclause pertaining to the redvani method of measurement, the conditions specified in 4.2 shall apply.
37、All measurements described in 5.2 to 5.14 are carried out at the analogue output of the equipment. 4.4.2 All measurements shall be made using specified test discs recorded without pre- emphasis unless otherwise specified in the relevant method of measurement. Examples are given in annex A. 4.4.3 The
38、 person who is doing the testing shall: a) report any deviations from the parameters specified in 4.2; b) report which test disc and measurement instruments have been used; c) ensure that, before measurement is started, the measurement instruments have reached stability. 4.4.4 Low-pass filter Passba
39、nd: 20 kHr Tolerance of response within the passband: f0,l dB Attenuation at 24,l kHz: 60 dB Attenuation at 44,l kHz and above: lo0 dB + 0,i O - 0.1 - 60 - loo 3k a0 k 24,l k 44,l k HZ lEc9trsi Figure 1 - Tolerances of low-pass filter STD.BS1 BS EN bLO7b-ENGL 1773 W 1b24bb9 ObL5057 b22 W Page 10 EN
40、6196 : 1993 r Test disc CD player 5 Measurement of electrlcal parameters 5.1 Maximum power consumption Definition R.M.S. voltmeter The maximum power that the CD player can G.aw from the electric supply dui operation (see IEC 65). lng any Method Using an ammeter, measure the r.m.s. current (I) taken
41、from the electrical supply when the CD player is operating under maximum voltage and load conditions. Result Maximum power consumption: I x Umax. For a.c. supplies, the result is quoted in Voltamperes, and for d.c. supplies, it is quoted in watts. 5.2 R8f8r8nC8 OUtpUZ VOfig8 Definition The r.m.s. ou
42、tput voltage that appears across the load impedance when reproducing the reference recorded level at the reference frequency. Block diagram Method If a volume control is provided, adjust the gain for the left channel to the rated output volt age. Play a 1 kHz signal at the reference recorded level,
43、and measure the output voltage from the left channel UA and the right channel UB. Resuft UA and UB are expressed in volts. Page 11 STD-BSI BS EN bLOSb-ENGL 1993 m 1b24bbS Ob15ObO 3Li4 m Low-pass Test disc I CO player filter ? EN 61096 : 1993 R.M.S. voltmeter 5.3 Definition Channel unbalance at 7 kHz
44、 The output level difference between the channels at the reference recorded level and reference frequency. Method Measure the left output voltage UA and the right output voltage Ue. Result Channel unbalance at 1kHz = 20 log I - I dB Oe 5.4 Total cross-talk attenuation Definition The difference betwe
45、en the level of the wanted signal in the left channel A and the level of an unwanted signal in the right channel B generated by the wanted signal in the left channel A, and vice versa, at the test frequency. Block diagram Test frequencies 1 kHz (mandatory, reference recorded level) 125 Hr and 10 kHz
46、 recommended Method Measure the left output level A derived from the test signal and the right output level B? induced by A and vice versa. STD-BSI BS EN bLOSb-ENGL 1773 m Lb24bb7 ObLSOb1 280 m Page 12 EN 61096 : 1993 Test disc - 5.5 Frequency response without de-emphasis Level meter CD player Defin
47、it ion The output level as a function of frequency of any given channel activated by signals intended for that channel relative to the level at the reference frequency. Block diagram I I i Level Test frequencies I Sweep frequency range between 20 Hz and 20 kHz. II Fixed frequencies between 20 Hz and
48、 20 kHz which shall include 1 kHz (preferably IS0 266 frequencies). Method Play a test disc which carries either sweep frequency signals or fixed frequency slgnals intended for the channel to be measured. The output level variations as a function of frequency are plotted. Result The frequency respon
49、se of each channel is the maximum deviation, quoted in decibels, relative to the level at the reference frequency. It should be presented in the form of a graph or table. 5.6 Frequency response with de-emphasis Definition The output level as a function of frequency of any given channel, activated by signals intended for that channel, when these signals have been recorded with pre-emphasis and are reproduced with de-emphasis relative to the level at the reference frequency. * * vi t Test dirt - Page 13 EN 6109
