381295/B
79
Improving the recognition of fish and schools
using receiver filters
Topics
About the receiver filter sequence in the SN90, page 79
Reducing noise and reverberation with the AGC (Automatic Gain Control) function,
page 80
Reducing propeller noise and interference with the Noise Filter, page 81
Reducing noise and false echoes with the Ping-Ping Filter, page 84
Adjusting the intensity of the echo presentations, page 86
About the receiver filter sequence in the SN90
The filters in the SN90 are implemented in “series”. Any changes to a filter setting may
therefore have an effect on subsequent filters.
A
Bottom Filter
B
Noise Filter (1)
C
Gain & TVG (Time Variable Gain)
D
Noise Filter (2)
E
AGC (Automatic Gain Control)
F
RCG (Reverberation Controlled Gain)
G
Display Gain
H
Ping-Ping Filter
Note that
Gain
,
TVG
(Time Varied Gain) and
Display Gain
are not filters, but included
only to illustrate the complete "signal path".
Содержание SN90
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