Dolby Laboratories DM100 Bedienungsanleitung PDF herunterladen (Seite 17)

Dolby

DM100 User’s Manual Getting Started

2-9

Set the unit to measure frequency drift as follows:

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

select A/V Freq Drift (see Section 4.2).

2. Connect a 29.97 or 25 fps video reference to DM100’s

V Ref input.

3. Connect the test AES signal to the DM100’s Digital In.

Read the measured frequency drift between the AES and video

signals by pressing [Status] and then navigating using the

[Down] button until Generator / Enter to View is displayed.

Press [Enter] to read the measured frequency drift (see

Section 3.2.5). The display indicates frequency difference in

AES samples: a positive number indicates the AES input signal

is faster than the video reference. Therefore, if the two signals

are locked, the display will read “0 samples.” Pressing [Enter]

resets the counter.

Modifying the Pass Through Output Signal

The DM100 can be used to repair improperly authored audio

streams. When in Pass Through mode, the DM100 can modify

channel status bits in the first and third bytes of the AES3 signal.

In addition, the output audio channels can be skewed or swapped

to correct improper channel alignment (see Section 4.5).

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Dolby Laboratories DM100 Bedienungsanleitung Seite 17