IEC 61606-2:2009

IEC 61606-2 ®
Edition 2.0 2009-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Audio and audiovisual equipment – Digital audio parts – Basic measurement
methods of audio characteristics –
Part 2: Consumer use
Équipements audio et audiovisuels – Parties audionumériques – Méthodes
fondamentales pour la mesure des caractéristiques audio –
Partie 2: Utilisation grand public

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IEC 61606-2 ®
Edition 2.0 2009-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Audio and audiovisual equipment – Digital audio parts – Basic measurement

methods of audio characteristics –

Part 2: Consumer use
Équipements audio et audiovisuels – Parties audionumériques – Méthodes

fondamentales pour la mesure des caractéristiques audio –

Partie 2: Utilisation grand public

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.01 ISBN 978-2-8322-1006-3

– 2 – IEC 61606-2:2009  IEC 2009
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, explanations and rated values . 7
3.1 Terms and definitions . 7
3.2 Explanation of terms “jitter” . 8
3.3 Digital interface for measurement . 8
3.4 Rated values . 8
4 Measuring conditions . 8
4.1 General . 8
4.2 Environmental conditions . 8
4.3 Power supply . 8
4.4 Test signal frequencies . 8
4.5 Standard setting . 8
4.6 Preconditioning . 9
4.7 Measuring instruments . 9
4.7.1 General . 9
4.7.2 Digital level meter . 9
4.7.3 Distortion meter . 9
4.7.4 Analogue weighting filter . 10
4.7.5 Digital weighting filter . 10
4.7.6 Digital spectrum analyzer . 10
5 Methods of measurement (digital-in/analogue-out) . 10
5.1 General . 10
5.2 Input/output characteristics . 10
5.2.1 Maximum output amplitude . 10
5.2.2 Gain difference between channels . 11
5.3 Frequency characteristics . 11
5.3.1 Frequency response . 11
5.3.2 Group delay (phase linearity) . 12
5.4 Noise characteristics . 13
5.4.1 Signal-to-noise ratio . 13
5.4.2 Dynamic range . 13
5.4.3 Out-of-band noise ratio . 14
5.4.4 Channel separation . 15
5.5 Distortion characteristics . 16
5.5.1 Level non-linearity . 16
5.5.2 Distortion and noise . 17
5.5.3 Intermodulation. 17
6 Methods of measurement (analogue-in/digital-out) . 18
6.1 General . 18
6.2 Input/output characteristics . 18
6.2.1 Analogue to digital level calibration . 18
6.2.2 Maximum allowable input amplitude. 20
6.2.3 Gain difference between channel and tracking error . 21
6.3 Frequency characteristics . 23

6.3.1 Frequency response . 23
6.3.2 Group delay . 24
6.4 Noise characteristics . 25
6.4.1 Signal-to-noise ratio (idle channel noise) . 25
6.4.2 Dynamic range . 27
6.4.3 Folded noise . 28
6.4.4 Cross-talk . 29
6.4.5 Channel separation . 31
6.5 Distortion characteristics . 33
6.5.1 Level non-linearity . 33
6.5.2 Distortion and noise . 34
6.5.3 Intermodulation. 35

Figure 1 – Connection diagram of equipment . 11
Figure 2 – Connection diagram of equipment . 11
Figure 3 – Connection diagram of equipment . 12
Figure 4 – Connection diagram of equipment . 13
Figure 5 – Connection diagram of equipment . 14
Figure 6 – Connection diagram of equipment . 14
Figure 7 – Connection diagram of equipment . 15
Figure 8 – Connection diagram of equipment . 16
Figure 9 – Connection diagram of equipment . 17
Figure 10 – Connection diagram of equipment . 17
Figure 11 – Connection diagram of equipment . 18
Figure 12 – Connection diagram of equipment . 19
Figure 13 – Connection diagram of equipment . 20
Figure 14 – Connection diagram of equipment . 20
Figure 15 – Connection diagram of equipment . 21
Figure 16 – Connection diagram of equipment . 22
Figure 17 – Connection diagram of equipment . 23
Figure 18 – Connection diagram of equipment . 23
Figure 19 – Connection diagram of equipment . 24
Figure 20 – Connection diagram of equipment . 24
Figure 21 – Connection diagram of equipment . 25
Figure 22 – Connection diagram of equipment . 26
Figure 23 – Connection diagram of equipment . 27
Figure 24 – Connection diagram of equipment . 27
Figure 25 – Connection diagram of equipment . 28
Figure 26 – Connection diagram of equipment . 28
Figure 27 – Connection diagram of equipment . 30
Figure 28 – Connection diagram of equipment . 30
Figure 29 – Connection diagram of equipment . 31
Figure 30 – Connection diagram of equipment . 32
Figure 31 – Connection diagram of equipment . 33
Figure 32 – Connection diagram of equipment . 33

– 4 – IEC 61606-2:2009  IEC 2009
Figure 33 – Connection diagram of equipment . 34
Figure 34 – Connection diagram of equipment . 34
Figure 35 – Connection diagram of equipment . 35
Figure 36 – Connection diagram of equipment . 36

Table 1 – Levels for measurement . 16
Table 2 – Interfering frequency . 29

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUDIO AND AUDIOVISUAL EQUIPMENT –
DIGITAL AUDIO PARTS –
BASIC MEASUREMENT METHODS
OF AUDIO CHARACTERISTICS –
Part 2: Consumer use
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide 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 activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced 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.
International Standard IEC 61606-2 has been prepared by IEC technical committee 100:
Audio, video and multimedia systems and equipment.
This second edition cancels and replaces the first edition published in 2003. It constitutes a
technical revision.
The significant technical changes with respect to the first edition are the following:
• changed the period of preconditioning;
• add A weighting filter in measuring instruments;
• correct the wrong reference number;
• some inappropriate descriptions have been improved.

– 6 – IEC 61606-2:2009  IEC 2009
The text of this standard is based on the following documents:
FDIS Report on voting
100/1548/FDIS 100/1582/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This part is to be used in conjunction with IEC 61606-1, General.
A list of all parts of the IEC 61606 series, under the general title Audio and audiovisual
equipment – Digital audio parts – Basic measurement methods of audio characteristics, can
be found on the IEC website.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee 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 revised edition, or
• amended.
AUDIO AND AUDIOVISUAL EQUIPMENT –
DIGITAL AUDIO PARTS –
BASIC MEASUREMENT METHODS
OF AUDIO CHARACTERISTICS –
Part 2: Consumer use
1 Scope
This part of IEC 61606 is applicable to the basic measurement methods of the audio
characteristics of the digital audio part of audio and audiovisual equipment for consumer use.
The common measuring conditions and methods are described in IEC 61606-1. This
International Standard specify conditions and methods of measurement for consumer
equipment are given in 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 (including any amendments) applies.
IEC 60268-2, Sound system equipment – Part 2: Explanation of general terms and
calculation methods
IEC 60958 (all parts), Digital audio interface
IEC 61606-1:2009, Audio and audiovisual equipment – Digital audio parts – Basic
measurement methods of audio characteristics – Part 1: General
IEC 61672-1, Electroacoustics – Sound level meters – Part 1: Specifications
IEC 61883-6, Consumer audio/video equipment – Digital interface – Part 6: Audio and music
data transmission protocol
IEC 61938, Audio, video and audiovisual systems – Interconnections and matching values –
Preferred matching values of analogue signals
3 Terms, definitions, explanations and rated values
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.
3.1.1
analogue full-scale amplitude
nominal signal level of an EUT corresponding to the digital full-scale level
NOTE In order to accommodate the EUT in an audio system, it is recommended that the analogue full scale
amplitude has the value defined in IEC 61938. In the case of general purpose audio for consumer equipment, the
amplitude is 2 V r.m.s.
– 8 – IEC 61606-2:2009  IEC 2009
3.1.2
normal load impedance
value defined in IEC 61938, or in the case of general purpose audio for consumer equipment,
22 kΩ
3.1.3
normal measuring level
analogue signal level equal to –20 dB of analogue full-scale amplitude
3.1.4
normal source impedance
value defined in IEC 61938, or in the case of general purpose audio for consumer equipment,
2,2 kΩ
3.2 Explanation of terms “jitter”
See 3.2 of IEC 61606-1.
3.3 Digital interface for measurement
This standard can be applied to IEC 60958 or IEC 61883-6.
Other interfaces having the same specification as in 3.1 of IEC 61606-1 may also be used.
3.4 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 pre-emphasis and de-emphasis characteristics;
• rated digital input word length;
• rated sampling frequencies.
4 Measuring conditions
4.1 General
The measuring conditions applied in this part are the same as those given in IEC 61606-1,
together with those given below.
4.2 Environmental conditions
As specified in 4.1 of IEC 61606-1.
4.3 Power supply
As specified in 4.2 of IEC 61606-1.
4.4 Test signal frequencies
As specified in 4.3 of IEC 61606-1.
4.5 Standard setting
As specified in 4.4 of IEC 61606-1.

4.6 Preconditioning
As specified in 4.5 of IEC 61606-1.
4.7 Measuring instruments
4.7.1 General
All specifications given in IEC 61606-1 are applicable, together with those given below.
4.7.2 Digital level meter
The r.m.s. signal level, V is calculated from the digital data within the in-band frequency
total
range.
One method of calculation is as follows:
When the frequency components are calculated by the FFT method, the signal level is
calculated as follows. All of the frequency components which are within the in-band frequency
range are calculated using the following equation:
2 2 2 2 1/2
V = (V +V + V + … V )
total f1 f2 f3 fn
The signal level S in dB is calculated from the following equation:
FS
S dB = 20 log (V /V )
l
FS 10 tota full
where V is the r.m.s. value of the full-scale amplitude of a 1 kHz signal.
full
The number of data points for the FFT calculation is greater than the value of f . The window
s
used for the measurement shall be the minimum window having the following parameters:
W(t) = 1/L [a + a cos(2πt/L) + a cos(4πt/L) + a cos(6πt/L)]
0 1 2 3
where
L is the number of data points,
= 0,363 491 2,
a
a = 0,489 268 2,
a = 0,136 508 8,
a = 0,010 731 8,
and t ≤ L/2.
NOTE If the signal level is calculated directly using digital data, it should be filtered to the in-band frequency
range before the calculation.
4.7.3 Distortion meter
Calculate the ratio of the total signal output to the noise and distortion component.
NOTE One measurement method is as follows.

– 10 – IEC 61606-2:2009  IEC 2009
The r.m.s. signal level, V is calculated from the resultant in-band frequency components of
total
the fast Fourier Transformation (FFT) of the processed input signal:
2 2 2 2 1/2
V = (V + V + V + … V )
total f1 f2 f3 fn
V , is obtained by the FFT for frequency ranges from 4 Hz to f , which is 1/1,5 of the
N L
measuring frequency and f which is 1,5 times the measuring frequency to the upper limit
H
frequency f , V is derived from the following equation:
MAX N
2 2 2 2 2 2 2 1/2
V = ((V + V + V + … V ) + ( V + V + V ))
N f1 f2 f3 fL fH fH+1 fMAX
The total distortion D is obtained from the equation:
D = V / V × 100 %
N total
The conditions for the measurement are the same as those for the digital level meter.
4.7.4 Analogue weighting filter
The weighing filter used shall have A-weighing characteristics with tolerances ±1 dB as
specified for sound level measurements in IEC 61672-1.
4.7.5 Digital weighting filter
The characteristics of weighing filter shall comply with A-weighing characteristics with
tolerances ±1 dB as specified for sound level measurements in IEC 61672-1.
4.7.6 Digital spectrum analyzer
A digital spectrum analyzer computes the Fast Fourier transform (FFT) of the input digital
signal.
5 Methods of measurement (digital-in/analogue-out)
5.1 General
The methods of measurement described in the following sub-clauses apply to the equipment
where the input signal is a digital audio signal and the output signal is an analogue signal. All
the specifications described in IEC 61606-1 which correspond to this standard are applied to
these subclauses.
These subclauses specify the details of measurement methods for consumer use equipment.
If the EUT provides two or more channels, all channels should be measured in the same way.
The word length and sampling frequency shall be stated in the expression of the results of the
measurement.
5.2 Input/output characteristics
5.2.1 Maximum output amplitude
5.2.1.1 Input signal
Frequency: 997 Hz
Signal level: full-scale level.

5.2.1.2 Procedures
Set the EUT to the standard setting specified in 4.5.
Apply the input signal to the EUT.
Adjust the level control and measure the maximum output voltage which does not show
clipping and has total distortion of less than 1 %.
5.2.2 Gain difference between channels
5.2.2.1 Block diagram of measuring devices
Connect the EUT and measuring instrument as in Figure 1.

Digital signal In-band level
Narrow band-pass filter
EUT
generator meter
IEC  2407/03
Figure 1 – Connection diagram of equipment
5.2.2.2 Input signal
Frequency: 997 Hz.
Signal level: normal measuring level (–20 dB ).
FS
5.2.2.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Adjust the gain control (if any) to the maximum position. Apply the same input signal to all
channels to be measured, either simultaneously or in turn.
c) Measure the output level of each channel.
d) The gain difference between the channels is expressed in dB.
5.3 Frequency characteristics
5.3.1 Frequency response
5.3.1.1 Block diagram of measuring devices
Connect the EUT and measuring instruments as shown in Figure 2.

In-band level
Digital signal
EUT
meter
generator
IEC  2408/03
Figure 2 – Connection diagram of equipment
5.3.1.2 Input signal
The following characteristics apply.

– 12 – IEC 61606-2:2009  IEC 2009
a) Reference signal
Frequency: 997 Hz.
Signal level: normal measuring level (–20 dB ).
FS
b) Test signal
Frequency: in the case of the discrete frequency method see IEC 61606-1, Table 1. In the
case of the sweep frequency, the frequency range is from 16 Hz to 1/2 × f
s
which is the same as the comment under the Table 1 of IEC 61606-1.
Signal level: normal measuring level (–20 dB ).
FS
5.3.1.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply a reference signal to the EUT and measure the output signal with the analogue in-
band level meter.
c) Repeat the same measurement as in b) for the test signals. Calculate the voltage ratio
between measurement b) and c) in dB.
d) The results are presented in a table or graphically.
5.3.2 Group delay (phase linearity)
5.3.2.1 Block diagram of measuring devices
Connect the EUT and measuring instruments as in Figure 3.

Analogue group
Digital signal
EUT
generator delay meter
IEC  1217/09
Figure 3 – Connection diagram of equipment
5.3.2.2 Input signal
The signal generator for group delay measurement (described in IEC 61606-1, 4.6.2.3.2) shall
be used.
5.3.2.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply the input signal to the EUT.
c) Analyze the output waveform from the EUT using FFT equipment to obtain the phase Φ
R
(degree) of the 1 kHz signal and calculate the group delay τ from the following equation:
R
τ = (– Φ /360) × (1/997)
R R
d) Repeat analyzing the testing frequency to obtain the phase Φ and the delay time τ from
C C
the following equation.
τ = (–Φ /360) × (1/f)
C C
If the phase wraps in excess of 360°, the reading shall be adjusted before computing the
above equation.
e) The group delay difference (τ ) and phase linearity (Φ ) at the measured frequency can
RC RC
be obtained from following equations.
τ = τ – τ
RC C R
Φ = τ × 360 × f
RC RC
5.4 Noise characteristics
5.4.1 Signal-to-noise ratio
5.4.1.1 Block diagram of measuring devices
Connect the EUT and measuring instrument as in Figure 4.

Analogue
Digital signal
In-band level
EUT Low-pass
weighting
generator
meter
filter
filter
IEC  1218/09
Figure 4 – Connection diagram of equipment
5.4.1.2 Input signal
The following characteristics apply.
Signal (A): Signal level = Full-scale level.
Frequency = 997 Hz.
Signal (B): Digital zero.
5.4.1.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply the signal (A) to the EUT and note the reading of the meter as A dB .
FS
c) Apply the signal (B) to the EUT and note the meter reading B dB .
FS
d) The signal-to-noise ratio SN in dB is obtained from the equation: SN = (A – B).
5.4.2 Dynamic range
5.4.2.1 Block diagram of measuring devices
Connect the EUT and measuring instrument as in Figure 5.

– 14 – IEC 61606-2:2009  IEC 2009

Digital Analogue
Analogue
Voltage
EUT Low-pass
signal weighting
distortion
amplifier
filter
generator filter meter
IEC  1219/09
NOTE If the analogue distortion meter has sufficient amplification for the measurement, the voltage amplifier may
not be needed.
Figure 5 – Connection diagram of equipment
5.4.2.2 Input signal
Frequency: 997 Hz.
Signal level: –60 dB .
FS
5.4.2.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply the input signal to the EUT.
c) Read the noise and distortion N (%), using the analogue distortion meter.
d) Repeat for each sampling frequency, if required.
e) The dynamic range(D dB) is calculated from the following equation:
D dB = 20 lg (N/100) + 60
5.4.3 Out-of-band noise ratio
5.4.3.1 Block diagram of measuring devices
Connect the EUT and measuring instrument as in Figure 6.

In-band
Low-pass filter
level meter
Digital signal
EUT
generator
Out-of band
Out-of band
band pass filter level meter
Analogue spectrum
analyzer
IEC  2412/03
Figure 6 – Connection diagram of equipment

5.4.3.2 Input signal
Frequency: 997 Hz, 10 007 Hz, 14 501 Hz, 19 997 Hz and the upper band-edge frequency.
Signal level: full-scale level (0 dB ).
FS
5.4.3.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply the input signal to the EUT.
.
c) Read the indication of the in-band level meter as A dB
FS
d) Read the indication of the out-of-band level meter as B dB .
FS
e) The out-of-band noise ratio is obtained from the equation:
Out-of-band noise ratio = (B – A) dB.
5.4.4 Channel separation
5.4.4.1 Block diagram of measuring devices
Connect the EUT and measuring instrument as in Figure 7.

Digital signal In-band level
Narrow-band
EUT
meter
generator band-pass filter
Analogue
spectrum analyzer
IEC  1220/09
Figure 7 – Connection diagram of equipment
5.4.4.2 Input signal
Frequency: 997 Hz and other frequencies in IEC 61606-1, Table 1, if necessary.
Signal level: full-scale level.
5.4.4.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply the input signal at 997 Hz to all channels which are bound in a single stereo source.
c) Adjust the balance control of the EUT so as to obtain equal output levels. If the output
levels cannot be adjusted, correct the measured values by the level difference.
d) Measure the level of the output signal as A dB .
FS
e) Apply digital zero to the input terminal of the selected channel and apply the same signal
as c) to other channels.
– 16 – IEC 61606-2:2009  IEC 2009
f) Measure the level of the output signal of the selected channel generated by the leakage
from unwanted channels as B dB. Repeat the same measurement for other frequencies if
needed.
g) Channel separation is obtained from the following equation:
channel separation = (A – B) dB
h) Change the selected channel and repeat steps e) to g).
5.5 Distortion characteristics
5.5.1 Level non-linearity
5.5.1.1 Block diagram of measuring devices
Connect the EUT and measuring instrument as in Figure 8.

In-band level
Digital signal Narrow-band
EUT
generator band-pass filter meter

IEC  2414/03
Figure 8 – Connection diagram of equipment
5.5.1.2 Input signal
Frequency: 997 Hz.
Signal level: given in Table 1.
Table 1 – Levels for measurement
Nominal level
dB
FS
−0 −82
−6 −89
−12 −100
−20 −108
−30 −113
−40 −120
−50 −132
−60 −137
−70
NOTE For 16 bit systems, use the signal level from the Table 1 that are less than 100 dB .
FS
When a 20 bit system is measured, –80 dB or –90 dB may be used instead of –82 dB
FS FS FS
or –89 dB .
FS respectively
When a 24 bit system is measured, –80 dB and –90 dB and –110 dB may be used
FS FS FS
instead of –82 dB or –89 dB or –113 dB respectively.
FS FS FS
5.5.1.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.

b) Set the level controller to the highest position if an output signal at the rated output signal
level is not obtainable.
c) Apply the input signal to the EUT and read the indication of the in-band level meter.
d) Repeat the measurement for other signal levels within the required signal range.
e) The linearity is obtained from the difference between the theoretical output level and the
actual measured value.
5.5.2 Distortion and noise
5.5.2.1 Block diagram of measuring devices
Connect the EUT and measuring instrument as in Figure 9.

Digital signal Analogue
Low-pass filter
EUT
generator distortion meter
IEC  2415/03
Figure 9 – Connection diagram of equipment
5.5.2.2 Input signal
Frequency: 997 Hz or as given in IEC 61606-1, Table 1, if needed.
Signal level: full-scale level (0 dB ).
FS
5.5.2.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply the input signal at 997 Hz to the EUT.
c) Read the indication of the analogue distortion meter.
d) Repeat the measurement for other input frequencies.
5.5.3 Intermodulation
5.5.3.1 Block diagram of measuring devices
Connect the EUT and measuring instrument as in Figure 10.

Inter-modulation
Digital signal generator
Low-pass filter
EUT
distortion meter
for inter-modulation
Analogue spectrum
analyzer
IEC  2416/03
Figure 10 – Connection diagram of equipment
5.5.3.2 Input signal
The signal specified in IEC 61606-1, 4.6.2.2 shall be used.

– 18 – IEC 61606-2:2009  IEC 2009
5.5.3.3 Procedure
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply the input signal to the EUT
c) Measure the intermodulation distortion of the output signal using the intermodulation
distortion meter.
6 Methods of measurement (analogue-in/digital-out)
6.1 General
The methods of measurement described in the following sub-clauses apply to equipment
where the input signal is an analogue signal and the output signal is a digital audio signal. All
specifications described in IEC 61606-1 are applicable to this standard and are described
below. These sub-clauses specify the details of measurement methods for consumer use
equipment.
There are two types of EUT. One is a EUT with digital output terminals and other is a EUT
without digital output terminal. The EUT without digital output terminal is typically recording
equipment such as DAT, CD-R and similar.
6.2 Input/output characteristics
6.2.1 Analogue to digital level calibration
6.2.1.1 Block diagram of measuring devices
6.2.1.1.1 EUT with digital output terminals
Connect the EUT and measuring instrument as in Figure 11.

Analogue signal Digital level meter
EUT
generator
In-band level
meter
IEC  2417/03
Figure 11 – Connection diagram of equipment
6.2.1.1.2 EUT without digital output terminals
Connect the EUT and measuring instrument as in Figure 12.

Standard
Digital level meter
Analogue signal
EUT
digital player
generator
In-band level
meter
IEC  2418/03
Figure 12 – Connection diagram of equipment
6.2.1.2 Input signal
Frequency: 997 Hz.
Signal level: normal measuring level (0,2 V r.m.s.)
6.2.1.3 Procedure
6.2.1.3.1 Equipment with digital output terminals
The following procedure applies.
a) Set the controls of the EUT to the standard settings specified in 4.5.
b) Apply the input signal to the EUT so that the normal measuring level of –20 dB is
FS
obtained by varying the input signal around 0,2 V r.m.s.
c) Read the indication of the in-band level meter, A V r.m.s.
d) Ten times A V r.m.s. is the analogue full-scale level.
6.2.1.3.2 Equipment without digital output terminals
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply the input signal with levels of –6 dB to +6 dB from the normal measuring level in
1 dB steps and record the signal to a recording medium.
c) Reproduce the recorded signal using the standard player and read the output signal level
on the digital level meter.
d) Estimate the analogue input signal level, A V r.m.s., which corresponds to 1/10 of the full-
scale output level. (10 × A V r.m.s.) is the analogue full-scale level.

– 20 – IEC 61606-2:2009  IEC 2009
6.2.2 Maximum allowable input amplitude
6.2.2.1 Block diagram of measuring devices
6.2.2.1.1 EUT with digital output terminals
Connect the EUT and measuring instrument as in Figure 13.

Digital distortion
Analogue signal
EUT
meter
generator
Digital wave form
In-band level
monitor
meter
IEC  2419/03
Figure 13 – Connection diagram of equipment
6.2.2.1.2 EUT without digital output terminals
Connect the EUT and measuring instrument as in Figure 14.

Standard
Analogue signal Digital distortion
EUT
digital player
generator meter
Digital wave form
In-band level
monitor
meter
IEC  2420/03
Figure 14 – Connection diagram of equipment
6.2.2.2 Input signal
Frequency: 997 Hz.
Signal level: from 0 V r.m.s. to in excess of the analogue full-scale level.
6.2.2.3 Procedure
6.2.2.3.1 Equipment with digital output terminals
The following procedure applies.
a) Set the EUT to the standard settings specified in 4.5.
b) Apply the input signal and increase the signal amplitude gradually from 0 V r.m.s.
If the level of the digital output terminal exceeds the normal measuring level (–0 dB ),
FS
adjust the level controller to maintain the output level to the normal measuring level.
c) Measure the input signal amplitude where furt
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