Dolby Laboratories DM100 Bedienungsanleitung PDF herunterladen (Seite 16)

Dolby

DM100 User’s Manual Getting Started

2-8

2.7 Advanced Features

Measuring the Latency of Equipment

The DM100 can be used to measure the latency of other audio

equipment. At user-defined intervals, the DM100 generates a

short burst of white noise, then measures the time taken for the

signal to return.

Set the DM100 to measure latency by following these steps:

1. Go to the Gen Control / Output Mode setup menu, and

select Latency Test (see Section 4.2).

2. Connect the Digital Out from the DM100 to the

equipment to be measured.

3. Connect the output of the equipment to be measured to

the DM100’s Digital Input.

Different clock sources used for the generator can be set in the

I/O Control / Gen Clock Source setup menu (see Section 4.5).

The time interval between the noise bursts can be set in the

Gen Control / Noise Burst Rate setup menu (see Section 4.2).

To read the measured latency, press [Status] and navigate using

the [Down] button until Generator ENTER to View is

displayed. Press [Enter] to display the measured latency in either

AES samples or milliseconds (see Section 3.2.5).

Measuring Audio/Video Frequency Drift

The DM100 determine if an AES digital audio or reference

signal is frequency-locked to a video black burst reference

signal. The unit locks to the video reference, then measures the

frequency difference between the Digital In input and the video

reference.

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Dolby Laboratories DM100 Bedienungsanleitung Seite 16