Lexicon Digital Controller DC-1 - Manual (Page 23)

17
DC-1 Digital Controller
Installation and
Calibration
Digital Input Status
Detection
When using a 48kHz digital connection from a source (DSS, DAT), the
following effects are available:
THX Cinema Two Channel
Logic 7 Music Logic
Pro Logic TV Matrix
Music Surround
Note that current "AC-3 ready" laser disc and LD/DVD players do not
output a single digital audio bitstream that incorporates the Dolby Digital
(AC-3) data. Instead, the AC-3 data from laser discs is output on a separate
RCA jack in Radio Frequency (RF) form. To maintain the exceptional
performance of the DC-1, an outboard demodulator is required to turn this
RF signal back into a digital bitstream. By performing the necessary de-
modulation outside the DC-1, the potential for RF interference is elimi-
nated. The Lexicon LDD-1 is an excellent example of one such device. An
outboard demodulator is not required for DVD players.
For recording purposes, it is advisable to connect both the analog and digital
outputs of your digital sources, as the record outputs do not have dedicated
D/A converters. It is possible, however, to use the internal D/A converters
in the DC-1 for recording. Select the input you want to record, then press the
REC/ZONE 2 button until red LEDs above the REC/ZONE 2 and the
corresponding input button light.
If a digital audio input is selected without a valid signal, or if a digital error
which affects audio performance is detected, all audio outputs are muted
and an error message is displayed. The associated input on the front panel
will display a blinking red LED while the error condition persists. When
valid data is restored, the error message is cleared and the unit returns to
normal operation. The display indicates the sample rate and AC-3 (if
appropriate) when a valid digital signal is being received. Whenever
Emphasis is detected within the incoming digital audio channel status bits,
de-emphasis is automatically applied.
"AC-3 Ready" Laser Disc and
LD/DVD Players
Recording a Digital
Source Using the
DC-1 D/A Converter
NOTE: Effect Bypass is engaged
when DIGITAL is selected for REC/
ZONE 2 in the Input Configuration
menu.