Lectrosonics R400 - Manual (Page 6)

R400
previous designs. Desired high frequency signals having
some coherence such as speech sibilance and tones are
not affected.
The Smart Noise Reduction algorithm has three modes,
selectable from a user setup screen: Off, Normal and
Full.
OFF - No noise reduction is performed and complete
transparency is preserved. All signals
presented to the transmitter’s analog front
end, including any faint microphone hiss, will
be faithfully reproduced at the receiver.
NORMAL (factory default) - Enough noise reduction
is applied to remove most of the hiss from
the mic preamp and some of the hiss from
lavaliere microphones. The noise reduction
benefit is dramatic in this position, yet the
degree of transparency maintained is
exceptional.
FULL - Enough noise reduction is applied to remove
most of the hiss from nearly any signal
source of reasonable quality, assuming
levels are set properly at the transmitter.
This additional noise reduction comes at the
cost of some transparency for low-level room
noise, yet the algorithm remains undetect­
able under most circumstances.
Note
The SmartNR setting is user selectable only in 400 Series mode. In
other modes, noise reduction is applied in such a way as to emulate
the original analog system as accurately as possible and is not user
adjustable.
LCD SCREEN
The LCD screen is used in conjunction with the MENU
control to change and control the operational settings,
and also provide a visual feedback of overall system
operation. (See FRONT PANEL MENU SELECTIONS.)
POWER SUPPLY
The R400 is operated from an external DC power source
with a range of +8 VDC to +18 VDC, up to 0.20 amperes
(200 milliamps) maximum. The receiver has a built-in
Poly-Fuse to protect the unit. If a problem occurs that
trips this fuse, it will reset after the power supply is
disconnected for about 15 seconds. The power input
section also has built-in protection circuits that prevent
damage to the receiver if a positive ground power source
is applied.
Note
The R400 requires external DC power and has no provisions for
internal batteries.
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