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4-TONE AUDIO SYSTEM
While the LCD (Liquid Crystal Display) is very accurate in identifying
buried objects, the user in the field does not always maintain the
display screen in his field of vision. Therefore, we have incorporated an
audio feedback mechanism to alert the user to the nature of buried
objects. This audio feedback system first alerts the user to the presence
and classification of objects, whose nature and location can be
confirmed using the LCD display.
The 4-tone audio target identification system functions only in the motion
modes of operation. The detector must be in the DISCRIMINATION
mode, as indicated on the display. In PINPOINT mode, the detector will
emit only a monotone sound.
The detector can sound four different tones, depending on the object
detected.
L
O
W
T
O
L
O
W
T
O
Ferrous objects, such as iron and steel, will induce a low tone.
The smallest gold objects can also induce a low tone.
L
O
W
-
M
I
L
O
W
-
M
I
Pull-Tabs, nickels & smaller gold
M
E
D
I
U
M
M
E
D
I
U
M
Newer pennies (post-1982), larger gold objects, zinc, and small
brass objects, will induce medium tones. Many recent vintage
non-U.S. currencies will induce medium tones.
H
I
G
H
T
O
H
I
G
H
T
O
Silver and copper coins, larger brass objects and older pennies
(pre-1982), will induce high tones. Quarters, dimes and other
precious coins fall into this category.
L
O
W
T
O
N
E
L
O
W
T
O
N
E
Nails, Iron Objects,
& Smallest Gold Objects
Audio Target Identification (ATI) classifies metals into four categories.
N
E
N
E
D
D
T
O
N
E
T
O
N
E
N
E
N
E
L
O
W
-
M
I
D
L
O
W
-
M
I
D
Pull Tabs, Nickels,
& Smaller Gold
M
E
D
I
U
T
O
N
E
M
E
D
I
U
T
O
N
E
Zinc Pennies (Post 1982),
Larger Gold Objects
M
T
O
N
E
H
M
T
O
N
E
H
Copper, Silver & Brass
Copper Pennies (Pre 1982)
I
G
H
T
O
N
E
I
G
H
T
O
N
E
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