SIST EN 60107-2:1999

Methods of measurement on receivers for television broadcast transmissions -- Part 2: Audio channels - General methods and methods for monophonic channels

Deals with the general methods of measurement of the audio channels of television receivers for monophonic and multichannel sound systems. Deals with the determination of performance and permits the comparison of equipment by listing characteristics useful for specifications and by laying down uniform methods of measurement.

Meßverfahren für Empfänger für Fernseh-Rundfunksendungen -- Teil 2: Tonkanäle - Allgemeine Meßverfahren und Meßverfahren für monophone Kanäle

Méthodes de mesures applicables aux récepteurs de télévision -- Partie 2: Voies son - Méthodes générales et méthodes pour voies monophoniques

Traite des méthodes générales de mesure des voies son des récepteurs de télévision pour systèmes monophoniques et à son multivoies. Permet la détermination du niveau de performances d'équipements ainsi que leur comparaison en dressant la liste des caractéristiques et en fixant des méthodes uniformes de mesures.

Methods of measurement on receivers for television broadcast transmissions -- Part 2: Audio channels - General methods and methods for monophonic channels (IEC 60107-2:1997)

General Information

• Status: Published
• Publication Date: 31-Mar-1999
• ICS: 33.160.25 - Television receivers
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-1999
• Due Date: 01-Apr-1999
• Completion Date: 01-Apr-1999
• Ref Project: EN 60107-2:1997 - Methods of measurement on receivers for television broadcast transmissions - Part 2: Audio channels - General methods and methods for monophonic channels

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60107-2:1999
01-april-1999
Methods of measurement on receivers for television broadcast transmissions --
Part 2: Audio channels - General methods and methods for monophonic channels
(IEC 60107-2:1997)
Methods of measurement on receivers for television broadcast transmissions -- Part 2:
Audio channels - General methods and methods for monophonic channels
Meßverfahren für Empfänger für Fernseh-Rundfunksendungen -- Teil 2: Tonkanäle -
Allgemeine Meßverfahren und Meßverfahren für monophone Kanäle
Méthodes de mesures applicables aux récepteurs de télévision -- Partie 2: Voies son -
Méthodes générales et méthodes pour voies monophoniques
Ta slovenski standard je istoveten z: EN 60107-2:1997
ICS:
33.160.25 Televizijski sprejemniki Television receivers
SIST EN 60107-2:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60107-2:1999SIST EN 60107-2:1999

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SIST EN 60107-2:1999SIST EN 60107-2:1999

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SIST EN 60107-2:1999SIST EN 60107-2:1999
NORME
CEI
INTERNATIONALE
IEC
60107-2
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1997-02
Méthodes de mesure applicables
aux récepteurs de télévision –
Partie 2:
Voies son –
Méthodes générales et méthodes
pour voies monophoniques
Methods of measurement on
receivers for television broadcast
transmissions –
Part 2:
Audio channels –
General methods and methods
for monophonic channels
 IEC 1997 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni utilisée No part of this publication may be reproduced or utilized in
sous quelque forme que ce soit et par aucun procédé, électronique any form or by any means, electronic or mechanical, including
ou mécanique, y compris la photocopie et les microfilms, sans photocopying and microfilm, without permission in writing from
l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE U
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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SIST EN 60107-2:1999SIST EN 60107-2:1999
60107-2 © IEC:1997 – 3 –
CONTENTS
Page
FOREWORD . 7
Clause
1 General. 9
1.1 Scope. 9
1.2 Normative references. 9
1.3 Definitions. 11
1.3.1 Audio channel. 11
2 General notes on measurements. 11
2.1 General conditions. 11
2.2 Audio-frequency input signal. 11
2.2.1 Standard reference frequency . 11
2.2.2 Audiofrequencies for measurements. 11
2.3 Radio-frequency (r.f.) television signal. 13
2.3.1 Carrier levels. 13
2.3.2 Modulation factor. 13
2.3.3 Reference modulation factor . 13
2.4 Radio-frequency input signals. 13
2.5 Measuring system and test instruments . 13
2.5.1 Audio filters. 15
2.5.2 Audio-frequency spectrum analyzer . 15
2.5.3 Audio voltmeter. 15
2.5.4 Psophometer (weighted noise meter). 15
2.6 Standard measuring conditions . 15
2.6.1 Standard r.f. television signal. 15
2.6.2 Standard r.f. input signal levels. 17
2.6.3 Standard output power and voltage. 17
2.6.4 Standard receiver settings. 17
2.7 General methods of measurement . 19
3 Audio-frequency output power.19
3.1 Definition. 19
3.2 Audio-frequency substitute load. 21
3.3 Measurement of audio-frequency output power . 21
4 Audio-frequency characteristics.21
4.1 Amplitude response to audiofrequencies. 21
4.1.1 Audio-frequency response characteristics. 21
4.1.2 Characteristics of tone control or equalizer . 23
4.1.3 Characteristics of loudness control. 23
4.1.4 Volume control characteristic . 25
4.2 Audio-frequency non-linear distortion . 25
4.2.1 Introduction. 25
4.2.2 Total harmonic distortion . 25
4.2.3 Intermodulation. 27

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SIST EN 60107-2:1999SIST EN 60107-2:1999
60107-2 © IEC:1997 – 5 –
Clause Page
5 Internally generated interference. 29
5.1 Buzz. 29
5.1.1 Definition. 29
5.1.2 Method of measurement. 29
5.1.3 Presentation of results. 29
5.2 Hum. 31
5.2.1 Definition. 31
5.2.2 Method of measurement. 31
5.2.3 Presentation of results. 31
5.3 Line-scan frequency interference. 31
5.3.1 Definition. 31
5.3.2 Method of measurement. 31
5.4 Amplitude modulation suppression ratio . 33
5.4.1 Definition. 33
5.4.2 Method of measurement. 33
5.4.3 Presentation of results. 33
6 Sensitivity. 35
6.1 Signal-to-noise ratio.35
6.1.1 Definition. 35
6.1.2 Method of measurement. 35
6.1.3 Presentation of results. 35
6.2 Ultimate signal-to-noise ratio. 37
6.2.1 Definition. 37
6.2.2 Method of measurement. 37
6.3 Noise-limited sensitivity. 37
6.3.1 Definition. 37
6.3.2 Method of measurement. 37
6.3.3 Presentation of results. 37
7 Immunity to undesired signals. 37
7.1 Introduction. 37
7.2 Basic method of measurement . 39
7.2.1 Measurement set-up. 39
7.2.2 Measurement procedure. 39
7.3 Presentation of results . 41
Table
1 Preferred frequencies. 43
Figures
1 200 Hz to 15 kHz bandpass filter . 45
2 22,4 Hz to 15 kHz bandpass filter . 45
3 Measurement of amplitude modulation suppression ratio . 47
4 Measurement of signal-to-noise ratio . 47
5 Measurement of wanted-to-unwanted r.f. signal ratio . 49
Annex
A Bibliography. 51

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SIST EN 60107-2:1999SIST EN 60107-2:1999
60107-2 © IEC:1997 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
METHODS OF MEASUREMENT ON RECEIVERS FOR TELEVISION
BROADCAST TRANSMISSIONS –
Part 2: Audio channels –
General methods and methods for monophonic channels
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60107-2 has been prepared by subcommittee 100A: Receiving
equipment, of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
This second edition cancels and replaces the first edition published in 1980 and constitutes a
technical revision.
This part of IEC 60107 should be used in conjunction with IEC 60107-1.
The text of this standard is based on the following documents:
FDIS Report on voting
100A/22/FDIS 100A/41/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.
Annex A is for information only.

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SIST EN 60107-2:1999SIST EN 60107-2:1999
60107-2 © IEC:1997 – 9 –
METHODS OF MEASUREMENT ON RECEIVERS FOR TELEVISION
BROADCAST TRANSMISSIONS –
Part 2: Audio channels –
General methods and methods for monophonic channels
1 General
1.1 Scope
This part of IEC 107 deals with the general methods of measurement of the audio channels of
receivers for monophonic systems and multichannel sound systems. General considerations
for the measurements are specified in IEC 107-1 and the measurements specific to the
multichannel sound systems are dealt with by IEC 107-3, IEC 107-4 and IEC 107-5.
Measurements for non-broadcast signals are dealt with by IEC 107-6.
This standard deals with the determination of performance and permits the comparison of
equipment by listing the characteristics which are useful for specifications and by laying down
uniform methods of measurement for these characteristics. Performance requirements are not
specified.
This standard does not deal with general safety matters, for which reference should be made to
*
IEC 65 [1] or other appropriate IEC safety standards, nor with radiation and immunity, for
which reference should be made to CISPR 13 and CISPR 20 [2] [3].
1.2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 107. At the time of publication, the editions indicated
were valid. All normative documents are subject to revision, and parties to agreements based
on this part of IEC 107 are encouraged to investigate the possibility of applying the most recent
editions of the normative documents indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC 107-1: 1997, Methods of measurement on receivers for television broadcast transmissions – Part 1:
General considerations – Electrical measurements at radio and video frequencies
IEC 107-3: 1988, Recommended methods of measurement on receivers for television broadcast
transmissions – Part 3: Electrical measurements on multichannel sound television receivers using
subcarrier systems
IEC 107-4: 1988, Recommended methods of measurement on receivers for television broadcast
transmissions – Part 4: Electrical measurements on multichannel sound television receivers using the
two-carrier FM-system
IEC 107-5: 1992, Recommended methods of measurement on receivers for television broadcast
transmissions – Part 5: Electrical measurements on multichannel sound television receivers using the
NICAM two-channel digital sound-system
IEC 107-6: 1989, Recommended methods of measurement on receivers for television broadcast
transmissions – Part 6: Measurement under conditions different from broadcast signal standards
___________
*
Figures in square brackets refer to the bibliography given in annex A.

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SIST EN 60107-2:1999SIST EN 60107-2:1999
60107-2 © IEC:1997 – 11 –
IEC 268-1: 1985, Sound system equipment – Part 1: General
IEC 268-2: 1987, Sound system equipment – Part 2: Explanation of general terms and calculation
methods
IEC 268-3: 1988, Sound system equipment – Part 3: Amplifiers
IEC 268-5: 1989, Sound system equipment – Part 5: Loudspeakers
IEC 315-1: 1988, Methods of measurement on radio receivers for various classes of emission – Part 1:
General considerations and methods of measurement, including audio-frequency measurements
Recommendation ITU-R BS 468-4: 1994, Measurement of audio-frequency noise voltage level in sound
broadcasting
1.3 Definitions
For the purpose of this part of IEC 107 the definitions in IEC 107-1, clause 2, as well as the
following definition apply.
1.3.1 Audio channel
Channel to convey audio information. A stereo channel consists of two audio channels for the
left and right signals.
2 General notes on measurements
2.1 General conditions
See 3.1 of IEC 107-1.
2.2 Audio-frequency input signal
2.2.1
Standard reference frequency
The standard reference frequency for audio-frequency measurements and for adjustment
purposes is 1 kHz.
NOTE – In the BTSC multichannel sound system, the standard reference frequency for modulation is 300 Hz.
2.2.2 Audiofrequencies for measurements
To facilitate the comparison of results, the selection of audiofrequencies for receiver
measurements shall preferably be restricted to a minimum. If a continuous record is not
required, measurements should be made at the frequencies selected from the preferred
frequencies shown in table 1 (see IEC 268-1).
Use of frequencies other than those indicated may be necessary for certain purposes, for
example at frequencies at which anomalies are observed.

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SIST EN 60107-2:1999SIST EN 60107-2:1999
60107-2 © IEC:1997 – 13 –
2.3 Radio-frequency (r.f.) television signal
2.3.1 Carrier levels
See 3.3.1 of IEC 107-1.
It should be noted that the level of a radio-frequency television signal is expressed by the level
of the modulated vision carrier even when the measurements are made on the audio channels.
The level of the sound carrier is set to the nominal vision-to-sound power ratio defined by the
television standard for which the receiver under test is designed. When a multichannel sound
system is used, the sound carrier(s) shall comply with its standard.
2.3.2 Modulation factor
In the case of sinusoidal modulation, the audio-frequency input level shall be expressed in
terms of the modulation factor of the radio-frequency input signal:
– for systems using an amplitude-modulated sound carrier or subcarrier, the modulation
percentage;
– for systems using a frequency-modulated sound carrier or subcarrier, the ratio of the
actual frequency deviation to the maximum deviation defined for the system as a
percentage;
– for systems using a digitally modulated sound carrier, the level referred to full-scale level
of an audio channel in decibels.
NOTE – Modulation with the control signals for multichannel sound systems is not included in the factor.
2.3.3 Reference modulation factor
Unless otherwise specified, the following modulation factors shall be used as a reference for
the measurements of audio channels:
a) Monophonic channel
– amplitude-modulated sound carrier: 54 %;
– frequency-modulated sound carrier: 54 %.
b) Stereophonic channel and additional audio channel
See IEC 107-3, IEC 107-4 and IEC 107-5.
NOTE – Reference modulation of the sound carriers specified in 3.3.2 of IEC 107-1 is not applied for the
measurements of audio channels.
2.4 Radio-frequency input signals
See 3.4 of IEC 107-1.
2.5 Measuring system and test instruments
See 3.5 of IEC 107-1.
In addition to the instruments specified in the above subclause, the following instruments are
required.

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SIST EN 60107-2:1999SIST EN 60107-2:1999
60107-2 © IEC:1997 – 15 –
2.5.1 Audio filters
The audio filters are used to eliminate unwanted frequency components outside of the audio-
frequency band to be measured. The following filters are required for the measurements:
F : bandpass filter with a 3 dB bandwidth of 200 Hz to 15 kHz and with a line-scan
1
frequency notch (see figure 1);
F : bandpass filter with a 3 dB bandwidth of 22,4 Hz to 15 kHz and with a line-scan
2
frequency notch (see figure 2);
F : 1 kHz bandpass filter;
3
F : 400 Hz band-elimination filter;
4
F : 400 Hz bandpass filter.
5
The filters F
and F shall have an attenuation slope of 12 dB/octave in the frequencies lower
1 2
than the lowest cut-off frequencies and an attenuation slope of 18 dB/octave in the frequencies
higher than 15 kHz, and an attenuation of at least 50 dB at the line-scan frequency.
The filters F and F are narrowband filters and F shall have an attenuation of at least 50 dB
3 5 4
at 400 Hz.
2.5.2 Audio-frequency spectrum analyzer
The audio-frequency spectrum analyzer is used to measure the spectrum and levels of an
audio signal and spurious frequency components in the audio-frequency band.
2.5.3 Audio voltmeter
The audio voltmeter is used to measure the r.m.s. voltage of an audio signal. A level meter with
voltage reading can be used as the voltmeter.
2.5.4 Psophometer (weighted noise meter)
The psophometer consists of a noise-weighting filter and a quasi-peak meter, which are
standardized by Recommendation ITU-R BS 468-4 (see IEC 268-1).
It is used to measure weighted signal-to-noise ratios, signal-to-buzz ratios and signal-to-interference
ratios.
The quasi-peak meter shall have decibel scales.
NOTE – Audio-frequency analyzers which integrate the above-mentioned instruments can be used.
2.6 Standard measuring conditions
Unless otherwise specified, the conditions described below shall be used for the
measurements.
2.6.1
Standard r.f. television signal
2.6.1.1 Test r.f. channel
A typical channel shall be used (see 3.3.3 of IEC 107-1).

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SIST EN 60107-2:1999SIST EN 60107-2:1999
60107-2 © IEC:1997 – 17 –
2.6.1.2 Modulation of the vision carrier
The vision carrier of the test r.f. channel shall be modulated with the full black signal in the
case of negative modulation and with the full white signal in the case of positive modulation
(see 3.2 of IEC 107-1).
2.6.1.3 Modulation of the sound carrier
The sound carrier of the test r.f. channel shall be modulated with an audio signal with the
standard reference frequency (1 kHz) at the reference modulation factor. If the television
system calls for a pre-emphasis, it shall be present in the modulation chain.
NOTE – For the modulation of sound carriers of multichannel sound systems, see IEC 107-3, IEC 107-4 and
IEC 107-5.
2.6.2 Standard r.f. input signal levels
The standard input level of an r.f. television signal at the antenna terminal shall be 70 dB(μV)
when terminated with a 75 Ω resistor.
For details, see 3.6.1 of IEC 107-1.
2.6.3 Standard output power and voltage
2.6.3.1 Standard output power for a loudspeaker
The standard output power shall be a power 10 dB below the rated output power (see 3.1).
Alternatively, a stated, preferred value of output power, not directly related to the rated value,
may be used; the preferred values are 500 mW, 50 mW and 5 mW. The corresponding levels
are 27 dB(mW), 17 dB(mW) and 7 dB(mW), respectively. In any case, the value chosen shall
be stated with the results.
2.6.3.2 Standard line output voltage
The standard output voltage at a line output terminal shall be 500 mV r.m.s. at 1 kHz when
terminated with a resistor equal to the rated load impedance.
NOTE – If the output is not adjustable, the output voltage when the standard r.f. television signal is applied to
the receiver at the standard r.f. input signal level, shall be used as the standard output voltage.
2.6.4 Standard receiver settings
2.6.4.1 Volume control
The volume control of the audio channel under test shall be set to obtain the standard audio
output power or voltage specified in 2.6.3 at the output terminal.
2.6.4.2 Tone control or equalizer
The tone control or equalizer, if provided, shall be set to the mechanical centre or to obtain the
flattest audio-frequency response at the output.
2.6.4.3 Loudness control
The loudness control, if provided, shall be set to obtain the flattest audio-frequency response at
the output.

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SIST EN 60107-2:1999SIST EN 60107-2:1999
60107-2 © IEC:1997 – 19 –
2.6.4.4 Balance control
The balance control of the stereo sound, if provided, shall be set to obtain equal output level
for both the left and the right channels.
2.6.4.5 Other controls
See 3.6.3 of IEC 107-1.
2.6.4.6 Termination of output terminals
Output terminals for loudspeakers shall be terminated with the audio-frequency substitute loads
(see 3.2). Line output terminals shall be terminated with resistors equal to the rated load
impedance.
2.7 General methods of measurement
Unless otherwise specified, each item described in clauses 4 to 7 shall be measured by the
following procedure:
– the receiver under test is brought under the standard measuring conditions specified in
2.6 and then respective characteristics of the receiver are measured;
– the power or voltage at the output terminal under test is measured with an audio
voltmeter connected to the terminal;
– if the receiver is equipped with both the loudspeaker output and line output, the
measurements shall be made on each output;
– when the receiver under test is designed for receiving a multichannel sound signal, the
measurements shall be made on each audio channel and also on the control signals. For
details, see IEC 107-3, IEC 107-4 and IEC 107-5.
3 Audio-frequency output power
3.1 Definition
The audio-frequency output power is the electrical power consumed in the audio-frequency
substitute load of a loudspeaker. It is expressed in watts, milliwatts or decibels (milliwatts).
The following concepts of audio-frequency output power are defined or measured:
a) Rated output power:
Output power at the rated total harmonic distortion specified by the manufacturer of the
receiver under test (see IEC 268-3 and IEC 315-1).
If this value is not available, the lowest value of output power measured according to 3.3 at
an audio-frequency of 1 kHz that gives 10 % total harmonic distortion.
b) Standard output power:
See 2.6.3.1.

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