![header thumbnail](/images/img-default-logo.png)
EN 61237-4:1997
Current
The latest, up-to-date edition.
![header thumbnail](/images/img-default-logo.png)
Broadcast video tape recorders - Methods of measurement - Part 4: Analogue audio performance measurements
21-11-1997
Foreword
1 General
1.1 Scope and object
1.2 Normative references
1.3 Definitions
2 Manual and automatic measurements
3 Procedure of measurement
4 Environmental conditions
5 Measurements on analogue audio baseband recording
using bias
5.1 Reproducing performance using calibration tape
5.2 Overall performance using reference tape
6 Measurement on analogue audio recording using
frequency modulation (FM audio)
6.1 Reproducing performance using calibration tape
6.2 Overall performance using reference tape
7 Special measurements
7.1 Measurements on FM carrier (unmodulated carrier
and deviation)
7.2 Measurements on AGC (amplitude characteristic;
attack time; hold time)
7.3 Measurements on switchable noise reduction circuits
7.4 Measurements on non-switchable noise reduction
systems (in combination with a non-switchable AGC)
7.5 Polarity test
Annex A (informative) Method of measurement for magnetic
tape flux
Annex B (informative) Bibliography
Annex ZA (normative) Normative references to international
publications with their corresponding European
publications
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.