
CVR–010
Advanced Settings
46
8.5. Reducing Noise Interference
・
The effect of noise interference coming from other onboard electronics or nearby echo
sounders can be reduced via the menu system in the following manner:
Figure 8-9 Selecting Noise Reduction Levels
(1) Press
, displaying the
MAIN MENU
.
(2) Select “
4:NOISE REDUCTION
” by pressing
(numeric key “
4
”)
or
/
, followed
by
.
・
This turns the
NOISE REDUCTION
submenu
on, as shown at right.
・
The following levels of noise reduction (
NR
)
are selectable:
-
N R = L O W
: Selects low reduction level.
-
N R = M I D
: Selects medium reduction level.
-
N R = H I G H
: Selects high reduction level.
-
N R = O F F
: Terminates the function (initially selected).
Figure 8-10 Noise Reduction Level Indication – Example
(3) Enter the desired echo threshold with
/
or appropriate numeric key. The
selected
NR
level is indicated as in the example above.
(4) Press
to complete the entry, and then
to exit the menu mode.
8.6. White
Line
Adjustment
8.6.1. Introduction
・
The white line adjustment
*
1
consists of separating the bottom echo from echoes of fish
or other objects lying on or close to the bottom by suppressing the strongest colors of
the bottom stratum without reducing the receiver gain on fish and other objects in
suspension.
・
The purpose of the function is to facilitate detection of fish echoes that look like a part of
the bottom echo and, therefore, are difficult to detect on the normal echogram.
*
1
:
This function is available when the echo display is set to
NORMAL DISPLAY
via the procedure given in paragraph
8.9.
MAIN MENU
1:TRANSDUCER DRAFT
2:DEPTH REFERENCE
3:ECHO THRESHOLD
4:NOISE REDUCTION
5:WHITE LINE
6:HISTORY SCALE
7:SIMULATION
8:ECHO DISPLAY
9:INSTALLATION SETTINGS
4:NOISE REDUCTION
1:OFF
2:LOW
3:MID
4:HIGH
Noise Reduction Level
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