Dolby Laboratories DM100 Uživatelský manuál stáhnout pdf (Strana 8)

Dolby

DM100 User’s Manual

1-1

Chapter 1

Introduction

1.1 About the DM100

The Dolby

DM100 is a hand-held diagnostic tool that can

monitor or generate Dolby Digital, Dolby E, and PCM

bitstreams. The unit allows audio systems integrators and service

engineers to quickly test the integrity and composition of these

signals throughout a facility. The DM100 is intended for use in

broadcast, cable, DBS, and postproduction facilities, as well as

DVD mastering and home theater installation.

The DM100 accepts input signals via XLR, BNC, and Toslink

™

connectors. The unit identifies the format of the input signal and

activates the appropriate built-in decoder. The decoded analog

signal, sent to a standard 1/8-inch stereo headphone jack, can be

switched to monitor any two decoded channels, while a small

built-in speaker can monitor the sum of any channel pair. A

front-panel LCD displays Dolby Digital and Dolby E metadata

information. Six front-panel LEDs indicate critical bitstream and

system status information.

A set of Dolby Digital, Dolby E, and PCM test bitstreams is

stored in internal, nonvolatile RAM, and can be changed in the

field via software download. The selected test bitstream is

produced simultaneously on all output connectors. The unit can

receive and decode an input signal while simultaneously

generating a test bitstream. The DM100 also features a pass-

through mode that allows modification of the input signal’s AES

channel status bits before passing the signal to the output

connectors. (The input signal can be monitored simultaneously.)

The DM100 also includes system level tests, such as latency

measurements, and the ability to check the clock

synchronization between audio and video signals.

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Dolby Laboratories DM100 Uživatelský manuál Strana 8