Specifications

2.30

Applications Manual

Revision 1.11Prism Sound dScope Series III

Collection of results

When a test from the test menu has been executed, its button becomes italicised in the test menu to

indicate that it has been completed. Results of completed tests are retained by the script, and any

graphical results are automatically exported to .EMF files in the 'Dolby Exports' folder within the main

dScope program folder. Having completed the desired tests, the operator is asked (upon exiting from

the tests menu) whether or not to create a document of the completed test results. If this option is

selected, a Microsoft Word document is created containing all results and plots, also in the 'Dolby

Exports' folder.

Customising the tests

This document describes the automatic execution of the Dolby Digital 2-channel tests, one at a time,

from a tests menu under the control of a central 'launcher script'. The script loads a dScope

Configuration for the selected test, and then starts the test, prompting the operator to play the relevant

track on the test DVD. The results of each test are presented for operator scrutiny, but precise

'pass/fail' limits are not applied (principally because few limits are specified by Dolby for the tests).

Since the launcher script and Configurations are 'soft', it is possible to customise the process

according to requirements. For example:

The execution of whichever tests were required could be automated as a single operation, with

track-prompts;

Pass/fail limits could be applied, with an overall pass/fail report generated;

Note that minor or temporary changes to a test Configuration can be made manually before clicking

the button to start the test.

Dolby Test Procedure document and Test DVD

The following reference document and test DVD are relevant to these tests, and are available from

Dolby Laboratories:

Dolby Digital Two-Channel Consumer Broadcast Products Test Procedure, Version 2.0, Issue 3

Dolby Digital Test DVD, version 1.0 or 1.5

Testing devices other than DVD players

The tests provided are tailored for testing 2-channel DVD players; however, it is also possible to test

other Dolby Digital 'Consumer broadcast equipment' such as set-top-boxes. In such cases it is

necessary to provide test stimuli in other format than DVD, for example by using the '.ac3' files

detailed in the

Dolby Digital 2-channel tests reference

section of this document.

Compatibility with Audio Precision System 2 test files and .ac3 files

The Dolby Test Procedure document details the Audio Precision System 2 test files for the analogue

and digital domain tests. When using dScope Series III these are replaced with the equivalent

dScope Configuration files, as listed below and at the beginning of each test in the

Dolby Digital 2-

channel tests reference

section.

The .ac3 files mentioned in the Dolby Procedure are included in this document for reference. In most

(but not all) cases the tracks on the DVD are the same as the .ac3 files.