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 line-
level 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.
Introduction
LDD-1
AC-3/RF Demodulator User Guide
1
Summary of Contents for LDD-1
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