EN 61096:1993/A1:1996

SLOVENSKI STANDARD
01-julij-1999
Methods of measuring the characteristics of reproducing equipment for digital
audio compact discs (IEC 61096:1992/A1:1996)
Methods of measuring the characteristics of reproducing equipment for digital audio
compact discs
Meßverfahren für die Eigenschaften von Wiedergabegeräten für Digital-Audio-
Compactplatten
Méthodes de mesure des caractéristiques des appareils de lecture pour les disques
compacts audionumériques
Ta slovenski standard je istoveten z: EN 61096:1993/A1:1996
ICS:
33.160.30 Avdio sistemi Audio systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME
CEI
INTERNATIONALE
IEC
INTERNATIONAL
STANDARD
AMENDEMENT 1
AMENDMENT 1
1996-10
Amendement 1
Méthodes de mesure des caractéristiques
des appareils de lecture pour les disques
compacts audionumériques
Amendment 1
Methods of measuring the characteristics
of reproducing equipment for digital
audio compact discs
 CEI 1996  Droits de reproduction réservés  Copyright - all rights reserved
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1096 Amend. 1 © IEC:1996 – 3 –
FOREWORD
This amendment has been prepared by subcommittee 100B: Recording, of IEC technical
committee 100: Audio, video and multimedia systems and equipment.
The text of this amendment is based on the following documents:
FDIS Report on voting
100B/28/FDIS 100B/50/RVD
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
__________
Page 7
2 Normative references
Insert, in the existing list, the titles of the following standards:
IEC 68-2-27: 1987, Environmental testing – Part 2: Tests – Test Ea and guidance: Shock
IEC 651: 1979, Sound level meters
IEC 721-3-5: 1985, Classification of environmental conditions – Part 3: Classification of groups
of environmental parameters and their severities. Ground vehicle installations
ISO 532: 1975, Acoustics – Methods for calculating loudness levels
ISO 1996: Acoustics – Description and measurement of environmental noise
ISO 3740: 1980, Acoustics – Determination of sound power levels of noise sources –
Guidelines for the use of basic standards and for the preparation of noise test codes
ISO 3741: 1988, Acoustics – Determination of sound power levels of noise sources – Precision
methods for broad-band sources in reverberation rooms
ISO 3742: 1988, Acoustics – Determination of sound power levels of noise sources – Precision
methods for discrete-frequency and narrow-band sources in reverberation rooms
ISO 3743-1: 1994, Acoustics – Determination of sound power levels of noise sources –
Engineering methods for small, movable sources in reverberant fields – Part 1: Comparison
method for hard-walled test rooms
ISO 3743-2: 1994, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Engineering methods for small, movable sources in reverberant fields –
Part 2: Methods for special reverberation test rooms
ISO 3744: 1994, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Engineering method in an essentially free field over a reflecting plane
ISO 3745: 1977, Acoustics – Determination of sound power levels of noise sources – Precision
methods for anechoic and semi-anechoic rooms

1096 Amend. 1 © IEC:1996 – 5 –
Page 15
4.3.1 Mechanical performance claims
Replace the text of this subclause by the following:
4.3.1.1 Shock and vibration resistance
Definition
The player insensitivity against direct or indirect mechanical shocks and vibrations as caused
by the supporting surface in vertical (z-direction) or in horizontal direction (x and y directions)
on the player cabinet.
a) Shock test
CD player + Oscilloscope
test disc
Mechanical
shock table
+z
+y
Direction of
+x
-x
acceleration
-y
-z
Shock table: according to IEC 68-2-27.
Oscilloscope: input A, LF direct;
input B LF 90° out of phase with A;
x-deflection via input B.
CD player: line output, left channel, directly connected to oscilloscope input A.
Test signal: 1 kHz left and right
Table excitation: according to IEC 68-2-27, figure 2: D = 3 ms, A = variable.
Test CD: according to annexes A and C of this standard for restricted CD parameters.
Method
Place the player on a board horizontally.
Apply shocks with increasing severity and observe the circle on the scope.
Set oscilloscope sensitivity of A and B 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 three times in all directions (+/–X, +/–Y +/–Z) for every severity
level.
1096 Amend. 1 © IEC:1996 – 7 –
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 pulse
Peak acceleration    Corresponding duration Corresponding
for the nominal pulse velocity change
-3
A
D
ΔV = 2/π x AD x 10
g Equivalent ms m/s
n
m/s
1 (10) 3 0,02
2 (20) 3 0,04
3 (30) 3 0,06
4 (40) 3 0,08
5 (50) 3 0,1
6 (60) 30 1,0
Result
Give for every direction the lowest severity level (in g’s) resulting in visible distortion of the
circle.
b) Vibration test
Low-pass
Distortion
CD player +
filter
meter
test disc
Mechanical
vibration table
+z
+y
Direction of
+x
-x
acceleration
-y
-z
Test signals
Test CD (see annexes A and C of this standard for restricted CD parameters):
400 Hz or 1 kHz preferably, 0 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.
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.

1096 Amend. 1 © IEC:1996 – 9 –
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 radiated 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.
Method
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 measuring 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 dB lower than the
sound pressure at the measuring point in each frequency band.
Test room parameters shall conform with ISO 3740, ISO 3741, ISO 3742, ISO 3743-1, ISO 3743-2,
ISO 3744 and ISO 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 ant
...