Specifications

2.47

Applications Manual

Revision 1.11Prism Sound dScope Series III

The dScope can measure various types of jitter in a variety of different ways. In this case, the

data jitter

from the EUT's digital output carrier is demodulated and fed to the dScope's analogue

Signal Analyzer. An FFT is calculated to show the spectrum of the jitter, and the peak level of the

jitter is also measured.

Specification

Dolby Laboratories does not provide a precise specification, however a peak jitter limit of 0.25UI (unit

intervals) is suggested in the

IEC60958

standard as a worst-case specification. In general, the figure

should not exceed 0.1UI.

4.2.2.3 Category Code

dScope Configuration:

Cat Code Track 19.dsc

Track Number:

(any)

Corresponding AP Test File:

Chanstat.at2

.ac3 Test File:

(any)

Duration:

Test Signal Description:

Description

This test checks that the Categor

y Code embedded in the

Channel Status

of the

EUT

's digital output

carrier correctly identifies the EUT, as defined in the

IEC60958

standard.