Specifications

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2.32

Applications Manual

Revision 1.11Prism Sound dScope Series III

4.2.1 Analogue domain tests

The following analogue domain tests are available, and are described in the following sections:

Reference Level

Maximum Output Level

Dialog Normalization

Dynamic Range Compression

Downmix

Separation

Frequency Response

THD vs Frequency

THD vs Level

Signal to Noise

Inter-channel Phase

For each test, the appropriate Track of the Dolby Digital Test DVD is listed and also, for non-DVD

player testing, the Dolby test file (.ac3).

Setting up

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

EUT

. Please make sure

that the following connections have been made:

Left Channel analogue output of Dolby Digital device to the dScope's Analogue Input A

Right Channel analogue output of Dolby Digital device to the dScope's Analogue Input B

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.

4.2.1.1 Reference Level

dScope Configuration:

Ref Level Track 8.dsc

Track Number:

Corresponding AP Test File:

Reflvl.at2

.ac3 Test File:

2_ref2k.ac3

Duration:

30 sec

Test Signal Description:

997Hz at –20dBFS (L & R)

Description

The Reference Level test is used to obtain the ideal

full-scale output amplitude

(FS) of the

EUT

Throughout testing the ideal FS amplitude of the EUT will be used as a reference amplitude.