Specifications

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2.57

Applications Manual

Revision 1.11Prism Sound dScope Series III

Dolby Digital Centre Channel Delay

Dolby Digital Surround Channel Delay

Noise Sequencer

The following Pro Logic tests are not currently implemented in the Dolby Digital

5.1-channel test scripts:

Pro Logic Functionality

Pro Logic Centre Channel Evaluation

Pro Logic Surround Channel Delay

Setting up

The analogue domain tests are measured at the analogue line outputs of the

EUT

. The connections

between the DVD player and the dScope will depend on whether an I/O Switcher is being used for the

test; please follow the on-screen instructions when the test script is started.

For unbalanced consumer equipment WITHOUT GROUND REFERENCE (such as

portable CD or DVD players or set-top-boxes) use the RCA/PHONO–XLR adaptor

provided to connect the EUT's analogue outputs to the dScope's XLR inputs

rather than using the normal (ungrounded) RCA/PHONO–BNC adapter. In some

cases, results may be improved by also grounding the chassis of the EUT to the

dScope's front-panel chassis terminal.

If the EUT has loudspeaker outputs

only,

then all tests should be performed at these outputs. Note

that some specifications are different in this case.

5.2.1.1 Reference Level

dScope Configuration:

Ref Level Track 30.dsc

Track Number:

Corresponding AP Test File:

5_reflevel

Duration:

30 sec

Test Signal Description:

997Hz at –20dBFS

Channels:

L, C, R, Ls, Rs

Description

The Reference Level test is used to obtain the ideal

full-scale output amplitude

(FS) of the

EUT

Throughout testing this ideal FS amplitude will be used as a reference amplitude.

Method

Select track 30, wait until the track has started playing, and then click the

[OK]

button to start the test.

The test track contains a –20

dBFS

sinusoidal stimulus at 997Hz. The measured amplitude at the

output of the EUT is increased by 20dB and entered as the dScope's dBr reference amplitude.

This

value is used as the 0dBFS reference amplitude in all subsequent tests unless otherwise noted.

A 0dBFS signal is not used to establish the reference amplitude since clipping, compression or other

issues may limit the EUT's output under this condition.