Lexicon Digital Controller DC-1 - Manual (Page 50)

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Lexicon
DC-1 Effects
Available only in the THX and Dolby Digital versions of the DC-1, this film
sound mode reproduces musical material with maximum separation at all
times, whether or not directional material is being steered. In addition,
Logic 7 uses intelligent steering to extract wide bandwidth stereo surround
channels. If both side and rear speaker pairs are available, signals may be
steered between the left side and left rear, or between the right side and right
rear. It is also possible for a signal to be steered fully to the rear speakers,
with the side surround speakers 6dB lower than the rears to provide
subjective rear imaging.
Logic 7 contains the re-equalizer feature of the THX Cinema effect, as well
as Lexicon's proprietary dialog enhancement feature. The combination of
stereo surround information during music and decorrelated effects, with
discrete steering to the sides and rears, gives Logic 7 unrivaled performance
on surround encoded films.
Logic 7
(THX and Dolby
Digital versions)
Parameter Initial Value Range
AUTO AZIMUTH ON ON/OFF
DIALOG ENHANCE 0.0dB 0.0dB, +3.0dB, +6.0dB
REAR ROLLOFF 8.2kHz 453Hz-20.0kHz
REAR DELAY OFFSET 5ms 0-20ms
RE-EQUALIZER ON ON/OFF
SIDE ASSIGN SIDE Front/Side, Front/Rear*
SURROUND LEVEL +0dB -5 to +5dB
SUBWOOFER LVL +0dB -5 to +5dB
EFFECT LEVEL +00dB -30 to +05dB
CUSTOM
* Dependent on speaker configuration
Logic 7 Parameters
AUTO AZIMUTH is short for auto azimuth error correction/automatic
input balance. Auto Azimuth should be set to ON for films, and OFF for
music. When ON, special patented algorithms continually monitor the
input signal and adjust both the relative level and time offset of the two
channels to keep the dialog properly centered and special effects properly
localized. This automatic feature is the reason the unit does not need an
input balance control for Dolby Surround decoding.
DIALOG ENHANCE boosts dialog in the center channel. By targeting
specific frequencies, it boosts only dialog, without raising the entire center
channel level (which would alter the output balance achieved during
calibration).
REAR ROLLOFF sets the cutoff frequency of a low pass filter in the rear-
channel. Frequencies above this setting are attenuated. This control should
be set high enough to give presence and airiness to the rear sound without
placing distracting instrumental overtones or other sounds behind you. In
systems configured without rear speakers, the settings affect the side out-
puts.