Lexicon LEXICON480LV4 Owner's Manual page 16

Lexicon 480L Owner's Manual
The 480L and Digital Audio I/O
In addition to its analog inputs and outputs, the 480L is
equipped with a PCM digital I/O connector. One appli-
cation for digital I/O is processing material from a PCM
1610 or compatible unit. The WET/DRY MIX control in
the reverb and effects programs makes it possible for
the 480L to add signal processing to a stereo mix;
without ever leaving the digital domain.
Another application for digital I/O is to cascade two or
more 480Ls together to create complex effects, again,
without leaving the digital domain. In this application
the first 480L in the chain supplies word clock for the
other units. Set the first unit for internal 48 kHz mode,
and the second and subsequent units for external 48
kHz mode.
Drive levels and data format are compatible with the
PCM 1610. Sync, preemphasis and flag bits are de-
rived from the input bit stream. The 480L may also be
interfaced with the Sony 3324 digital multitrack re-
corder. The 3324 uses a balanced 1610 format, but this
is easily accomodated by grounding the low side of
each signal line at the 480L interface connector.
Input and Output Configuration
The digital audio outputs can be used at the same time
as the analog outputs, and they are always available at
the Digital Audio I/O connector on the rear panel. The
digital audio outputs receive the same material as the
Main Outputs. The Aux Outputs are not available at the
Digital I/O connector.
1-10
The digital audio inputs cannot be used at the same
time as the analog inputs. When the digital inputs are
in use, the analog inputs are disabled.
Important! Do not power up with external word
clock present at the 480L's digital I/O port. Doing
so may prevent the unit from finishing its
power up sequence.
If you encounter problems with distortion or loss of
signal, the PLL circuitry may have become misaligned
in shipment. See Appendix B, Solving Problems for
details.
Note: A digital audio I/O interface box which can
greatly simplify interfacing the 480L is available as
an option. Contact your Lexicon Representative
for details.
Conversion to AES/EBU
The 480L's 1610/1630 compatible signal can be trans-
lated to AES/EBU to allow interfacing with devices
using this digital I/O format. To accomplish this, an
external format converter such as Lexicon's LFI-10 is
required. The following figure details digital intercon-
nection using a format converter.