Kongsberg Simrad SN90 Reference Manual page 483

A Bottom Filter
Noise Filter (1)
B
Gain & TVG (Time Variable Gain)
C
Noise Filter (2)
D
AGC (Automatic Gain Control)
E
RCG (Reverberation Controlled Gain)
F
Display Gain
G
Ping-Ping Filter
H
Note that ,
Gain TVG
only to illustrate the complete "signal path".
Details
Off
The automatic gain control (AGC) is disabled.
Weak
A mean value for all the echoes is established. The value is used as a threshold.
Echoes below this threshold are suppressed.
Medium
The threshold value is increased by 3 dB compared to Weak.
Strong
The threshold value is increased by 3 dB compared to Medium.
Related topics
Improving the recognition of fish and schools using receiver filters, page 118
AGC (Automatic Gain Control), page 626
Functions and dialog boxes, page 416
Active menu: functions and dialog boxes, page 463
381294/E
(Time Varied Gain) and
Functions and dialog boxes
are not filters, but included
Display Gain
481