Specifications
2.53
Applications Manual
© 2003-2005 Prism Media Products Ltd
Revision 1.11Prism Sound dScope Series III
5 Dolby Digital 5.1-channel
The dScope can perform conformance testing of Dolby Digital 5.1-channel replay devices such as
DVD players (in conjunction with the
Dolby DVD Test DVD
), when operating in 5.1-channel and two-
channel modes.
An easy-to-use script and accompanying Configurations are provided which shows a menu of all
available tests, and guides you through each test. This script and the accompanying Configurations
are installed automatically from the dScope's installation CD; updates may be obtained from
www.prismsound.com
, or by contacting Prism Sound or your local distributor. Contact details are
provided in the
General information
section.
Details of how to get started with Dolby Digital 5.1-channel testing are in the
Overview
section.
5.1 Overview
This document describes how to perform the 5.1-channel tests required by Dolby Laboratories for
DVD players and broadcast consumer products, as specified in the
Dolby Test Procedure document
,
using a Prism Sound 'dScope Series III' audio analyzer. For details of the individual tests, refer to the
Dolby Digital 5.1-channel tests reference
section of this manual.
This document is not meant as a replacement for the Dolby Digital Test Procedure document, and all
tests should be performed with reference to that document for full details of the tests.
Two-channel tests
The Dolby Digital 5.1-channel DVD Test Procedure requires that 5.1-channel DVD players are also
tested in two-channel mode. To perform these tests, configure the DVD player for two-channel mode
and refer to the manual for
Dolby Digital 2-channel testing.
Running the tests
The dScope's Dolby Digital 5.1-channel tests are accessed from the Default User Bar of the dScope,
under "Applications:Dolby Digital 5.1-channel" if that User Bar is configured, or alternatively by running
the "Dolby Digital 6Ch.dss" launcher script by selecting "Run Script" from the Automation menu. The
launcher script presents a tests menu, from which each test may be automatically performed, with
prompting for the required tracks from the
Dolby Digital Test DVD
.
Before launching the menu, the script will prompt you for the name and serial number of the Product.
This will be used to store test results; see
Collection of results
(below) for more details.
Automatic testing using a Switcher
The Dolby Digital 5.1-channel tests can be run using an I/O Switcher, a
dS-NET
peripheral. The I/O
Switcher is a
16-into-2 relay switcher, which can be used for switching either analogue or digital
(AES3) audio signals. For each test, the switcher can speed up testing by switching each of the
channels of the Dolby Digital 5.1-channel output in turn into the dScope's analogue inputs, thus
eliminating the need for repeated plugging and unplugging of cables. See
I/O Switchers in the
dS-
NET Peripherals manual for further details.
If an I/O Switcher is not available, the 5.1-channel tests can still be performed, but the operator will
have to manually change the inputs to the dScope by plugging and unplugging cables. At the start of
the test, the launcher script will prompt whether the I/O Switcher is to be used; if so, then the script
assumes that the switcher has an address of 0. This can be changed in the script if required.