Lexicon LDD-1 Owner's Manual

LDD-1

AC-3/RF Demodulator

User Guide

Unpacking and Inspection

Save all packing materials in case you ever need to ship the unit. Thoroughly inspect the unit and packing materials for signs of damage.
Report any shipment damage to the carrier at once; report equipment malfunction to your dealer.

Precautions

Save these instructions for later use.
Follow all instructions and warnings marked on the unit.
Always use with the correct line voltage. Refer to the manufacturer's operating instructions for power requirements. Be advised that different operating voltages may require the

use of a different line cord and/or attachment plug.
Do not install the unit in an unventilated rack, or directly above heat producing equipment such as power amplifiers. Observe the maximum ambient operating temperature listed

in the product specification.
Slots and openings on the case are provided for ventilation; to ensure reliable operation and prevent it from overheating, these openings must not be blocked or covered. Never

push objects of any kind through any of the ventilation slots. Never spill a liquid of any kind on the unit.
This product is equipped with a 3-wire grounding type plug. This is a safety feature and should not be defeated.
To prevent shock or fire hazard, do not expose the unit to rain or moisture, or operate it where it will be exposed to water.
Do not attempt to operate the unit if it has been dropped, damaged, exposed to liquids, or if it exhibits a distinct change in performance indicating the need for service.
This unit should only be opened by qualified service personnel. Removing covers will expose you to hazardous voltages.

This triangle, which appears on your
component, alerts you to the pres­ence of uninsulated, dangerous volt­age inside the enclosure... voltage
that may be sufficient to constitute a
risk of shock.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This triangle, which appears on your
component, alerts you to important
operating and maintenance instruc­tions in this accompanying litera­ture.

Acknowledgements

The CP and DC Series are manufactured under license from Dolby Laboratories Licensing Corporation. Additionally licensed under one or more of the following patents: U.S.
numbers 3,632,886, 3,746,792 and 3,959,590; Canadian numbers 1,004,603 and 1,037,877. "Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing
Corporation.

Copyright 1997 Lexicon, Inc.
All Rights Reserved.

Lexicon Inc. • 3 Oak Park • Bedford MA 01730-1441

Telephone [phone] • Fax [phone]

Lexicon Part # 070-11659 Rev 1

LDD-1

AC-3/RF Demodulator

Congratulations on your purchase of the Lexicon LDD-1. The LDD-1 is designed to interface between
a laser disc player (with an AC-3/RF output), and any Dolby Digital decoder which accepts a standard
AC-3 signal (like our DC-1). Because “AC-3 ready” laser disc players use a separate Radio Frequency
(RF) modulated output to carry the Dolby Digital information, special considerations must be made.
While this type of transmission works perfectly well, our engineers were rightfully reluctant to inject line­level RF directly into the meticulously designed DC-1. The solution is the LDD-1.

The LDD-1 keeps potential RF interference away from the sensitive preamp/processor stage while
providing highly useful improvements in AC-3 signal quality. By placing the requisite demodulation
circuitry in its own enclosure with dedicated power supplies and grounding, the potential to degrade
digital-to-analog conversion and analog audio signals within the preamp/processor is eliminated.

The LDD-1 incorporates fully automated “intelligent” switching between S/PDIF and AC-3/RF inputs,
meaning that any laser disc will be decoded to its maximum inherent quality. A low voltage “turn on
trigger” input and output are included for interconnection to the Lexicon DC-1 and NT Series Amplifiers.
The stringently designed outboard power supply ensures maximum signal purity.

We have designed this manual to provide a brief overview of the demodulator, as well as to provide the
information necessary for safe installation and operation. We trust that the time you invest in reviewing
these brief instructions will be rewarded by the best possible performance and longevity of your
equipment.

User Guide

Introduction

1