Non-broadcast video tape recorders - Methods of measurement - Part 4: Calibration tape (NTSC/PAL/SECAM)

Specifies the general requirements for the calibration tape which is used for measurement of signal characteristics of the playback systems of non-broadcast video tape recorders (NTSC/PAL/SECAM). Appliles particularly to the measurement items which require complex test signals unavailable from a general purpose test signal generator.

Videobandgeräte für den Gebrauch außerhalb des Rundfunks - Meßverfahren - Teil 4: Bezugsband (NTSC/PAL/SECAM)

Magnétoscopes hors radiodiffusion - Méthodes de mesure - Partie 4: Bande étalon (NTSC/PAL/SECAM)

Spécifie les exigences générales pour les bandes étalons qui sont utilisées pour la mesure des caractéristiques de signaux en lecture, des magnétoscopes hors radiodiffusion (NTSC/PAL/SECAM). S'applique en particulier aux procédés de mesure qui nécessitent des signaux d'essai non disponibles avec un générateur d'usage général de signaux d'essai.

Non-broadcast video tape recorders - Methods of measurement -- Part 4: Calibration tape (NTSC/PAL/SECAM) (IEC 61041-4:1997)

General Information

Status
Published
Publication Date
03-Aug-1997
Current Stage
6060 - Document made available
Due Date
04-Aug-1997
Completion Date
04-Aug-1997

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SLOVENSKI STANDARD
SIST EN 61041-4:1999
01-april-1999
Non-broadcast video tape recorders - Methods of measurement -- Part 4:
Calibration tape (NTSC/PAL/SECAM) (IEC 61041-4:1997)

Non-broadcast video tape recorders - Methods of measurement -- Part 4: Calibration

tape (NTSC/PAL/SECAM)

Videobandgeräte für den Gebrauch außerhalb des Rundfunks - Meßverfahren -- Teil 4:

Bezugsband (NTSC/PAL/SECAM)
Magnétoscopes hors radiodiffusion - Méthodes de mesure -- Partie 4: Bande étalon
(NTSC/PAL/SECAM)
Ta slovenski standard je istoveten z: EN 61041-4:1997
ICS:
33.160.40 Video sistemi Video systems
SIST EN 61041-4:1999 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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NORME
CEI
INTERNATIONALE
IEC
61041-4
INTERNATIONAL
Première édition
STANDARD
First edition
1997-05
Magnétoscopes hors radiodiffusion –
Méthodes de mesure –
Partie 4:
Bande étalon (NTSC/PAL/SECAM)
Non-broadcast video tape recorders –
Methods of measurement –
Part 4:
Calibration tape (NTSC/PAL/SECAM)
 IEC 1997 Droits de reproduction réservés  Copyright - all rights reserved

Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in

utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,

procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in

copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.

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Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue
---------------------- Page: 2 ----------------------
61041-4 © IEC:1997 – 3 –
CONTENTS
Page

FOREWORD ................................................................................................................................... 5

INTRODUCTION............................................................................................................................. 7

SECTION 1: GENERAL
Clause

1.1 Scope and object................................................................................................................... 9

1.2 Normative references............................................................................................................ 9

1.3 Definitions.............................................................................................................................. 11

1.4 Requirements........................................................................................................................ 11

SECTION 2: SPECIFICATIONS OF THE SIGNALS TO BE RECORDED
ON THE CALIBRATION TAPE

2.1 Luminance signal level.......................................................................................................... 13

2.2 Dropout compensation characteristics.................................................................................. 13

2.3 Y/C delay............................................................................................................................... 17

2.4 Switching position.................................................................................................................. 17

2.5 Audio FM reference recording level ...................................................................................... 19

2.6 Audio FM peak recording level.............................................................................................. 21

2.7 Audio FM frequency response .............................................................................................. 23

Figures

1 Block diagram for luminance level preparation ..................................................................... 27

2 Block diagram for the dropout generator............................................................................... 27

3 Block diagram for dropout level adjustment.......................................................................... 29

4 Dropout of 20 μs duration......................................................................................................29

5 Black marker in the dropout .................................................................................................. 29

6 Dropout of 3 H duration......................................................................................................... 31

7 Location of dropouts.............................................................................................................. 31

8 Block diagram for Y/C delay measurement........................................................................... 33

9 Signal to be recorded ............................................................................................................ 33

10 Delay in the luminance signal recording................................................................................ 33

11 Delay in the chrominance signal recording ........................................................................... 35

12 Block diagram for switching position adjustment .................................................................. 35

13 Setting of the travelling microscope ...................................................................................... 35

14 View on the magnetic coating side of the tape...................................................................... 37

15 Block diagram for switching position measurement.............................................................. 37

16 Switching position.................................................................................................................. 37

17 Block diagram for audio FM reference peak level recording................................................. 39

18 Block diagram for audio FM frequency response signal recording ....................................... 39

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61041-4 © IEC:1997 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
__________
NON-BROADCAST VIDEO TAPE RECORDERS –
METHODS OF MEASUREMENT –
Part 4: Calibration tape (NTSC/PAL/SECAM)
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 61041-4 has been prepared by subcommittee 60B: Video recording,

then by subcommittee 100B: Recording, of IEC technical committee 100: Audio, video and

multimedia systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100B/44/FDIS 100B/64/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.

IEC 61041 consists of the following parts under the general title: Non-broadcast video tape

recorders – Methods of measurement:
Part 1: 1990, General video (NTSC/PAL) and audio (longitudinal) characteristics
Part 2: 1994, Video characteristics chrominance SECAM
Part 3: 1993, Audio characteristics for FM recording
Part 4: 1997, Calibration tape (NTSC/PAL/SECAM)

Part 5: 1997, High-band video tape recorders, including those equipped with Y/C video

connectors (NTSC/PAL)
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61041-4 © IEC:1997 – 7 –
INTRODUCTION
This part of IEC 61041 has been prepared for the reasons given below.

Some of the measurement items for non-broadcast video tape recorders in IEC 61041 require

specific test signals which may not be available from a general purpose test signal generator.

In this case, a calibration tape can be made and used to supply the required test signals for

measurement.
The video tape recorders on the market today have very good record and playback

compatibility, provided that the level of the test signals and the frequencies of the carriers to be

recorded are set precisely within specifications. The calibration tape can therefore be made

using a non-broadcast video tape recorder of the relevant recording format by recording the

specified test signals.

This part of IEC 61041 specifies the video and audio test signals to be recorded on the calibration

tape which is used when measuring video and audio characteristics of non-broadcast video

tape recorders, in accordance with the measurement items prescribed in IEC 61041.

---------------------- Page: 5 ----------------------
61041-4 © IEC:1997 – 9 –
NON-BROADCAST VIDEO TAPE RECORDERS –
METHODS OF MEASUREMENT –
Part 4: Calibration tape (NTSC/PAL/SECAM)
1 Section 1: General
1.1 Scope and object

This part of IEC 61041 specifies the general requirements for the calibration tape which is used

for measurement of signal characteristics of the playback systems of non-broadcast video tape

recorders (NTSC/PAL/SECAM).

The calibration tape specified in this part of IEC 61041 applies particularly to the measurement

items prescribed in the relevant part of IEC 61041 which require complex test signals, which

are unavailable from a general purpose test signal generator.

The object of this part is to describe the methods of measurement for non-broadcast video

tape recorders.

This part of IEC 61041 describes also the procedures for generating the signals and for

recording the signals on the calibration tape.
1.2 Normative references

The following normative documents contain provisions which, through reference in this text,

constitute provisions of this part of IEC 61041. 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 61041 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 60094-2: 1994, Magnetic tape sound recording and reproducing systems – Part 2:

Calibration tapes

IEC 61041-1: 1990, Non-broadcast video tape recorders – Methods of measurement – Part 1:

General video (NTSC/PAL) and audio (longitudinal) characteristics

IEC 61041-2: 1994, Non-broadcast video tape recorders – Methods of measurement – Part 2:

Video characteristics chrominance SECAM

IEC 61041-3: 1993, Non-broadcast video tape recorders – Methods of measurement – Part 3:

Audio characteristics for FM recording

IEC 61054: 1991, Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic

tape on type VHS – FM audio recording

ITU-R Recommendation 471-1: 1990, Nomenclature and description of colour bar signals

EIA RS-189A: 1976, Encoded colour bar signal
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61041-4 © IEC:1997 – 11 –
1.3 Definitions
For the purpose of this part of IEC 61041, the following definitions apply:

1.3.1 calibration tape: Tape used to evaluate aspects of the performance of non-broadcast

video tape recorders. This tape contains video and FM audio signals appropriate to the video

tape recorder to be tested, taking into consideration the specified items in the audio system

test described in IEC 60094-2.

1.3.2 calibration tape recorder: Video tape recorder which is used to record the test signals

specified in this part of IEC 61041 for producing the calibration tape.
1.4 Requirements
1.4.1 Magnetic tape to be used

The video tape to be used shall conform to the recording format specifications of the

calibration tape recorder. It is preferable to use a subreference tape.
1.4.2
Video signal to be recorded

The video signal to be recorded shall conform to the standard TV signal specified for record

and playback of the calibration tape recorder.
1.4.3 Audio signal to be recorded

The audio signal to be recorded shall conform to the audio recording format specified for

record and playback of the calibration tape recorder.
1.4.4 Marking on the cassette
The cassette shall be labelled with the following information:
– TV system;
– applicable recording format;
– details of signals;
– date/month/year when the tape was recorded;
– name of the person or the company who made the recording;
– others.
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61041-4 © IEC:1997 – 13 –

2 Section 2: Specifications of the signals to be recorded on the calibration tape

2.1 Luminance signal level

This subclause specified the luminance signals to be recorded on the calibration tape with

specified sync-tip frequency, peak white frequency, and frequency deviation, so that they

conform to the recording format.
2.1.1 Block diagram

Figure 1 shows the block diagram for generating the signal on this section of the calibration

tape.
2.1.2 Signal to be recorded

The video signal to be recorded on the calibration tape shall be a colour bar signal of ITU-R

Recommendation 471-1, type (b) or equivalent containing a 100 % (0,714 V and 0,700 V

p-p p-p

for PAL) white signal. The level of the sync signal shall be 40 % (0,286 V ) for NTSC or 43 %

p-p
(0,300 V ) for PAL/SECAM.
p-p
2.1.3 Procedures

a) Input the signal from a TV test signal generator to the calibration tape recorder.

b) Using a carrier checker (or a spectrum analyzer), observe the output from the frequency

modulator of the luminance signal. Then, adjust the sync-tip frequency, the peak white

frequency, and the frequency deviation as specified below.

With respect to the reference frequencies specified for the recording format of the calibration

tape recorder, the sync-tip frequency shall be within ±0,05 MHz, the peak white frequency shall

be within ±0,05 MHz, and the frequency deviation shall be within ±2 %.

NOTE – For precise measurement, use a carrier checker. Use of a spectrum analyzer for this measurement may

result in larger measurement errors.

It is advisable to check that the recording current for the chrominance signal meets the specification for the

respective format, prior to starting measurement.
2.2 Dropout compensation characteristics

This subclause specified the signal to be recorded on the calibration tape for measurement of

the dropout compensation characteristic of the luminance signal. With this method, in

accordance with the method described in 2.8.3 a) of IEC 61041-1, the dropout compensation

characteristic (DCC) can be measured simply by using a TV monitor.
2.2.1 Block diagram

Figures 2 and 3 show the block diagram of the dropout generator and the dropout level

adjustm
...

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