Chapter 5
CVS-841/851
Basic Operation
Operational notes for the STC law
. STC law A: STC is not enough, causing the noise and unwanted residual weak echoes in
a shallow or mid depth zone to be shown.
.STC law B: STC is appropriate, causing unwanted echoes to be perfectly reduced while
schools of fish are shown without degradation.
. STC law C: STC is too much, causing the echoes from fish schools to be reduced too much.
5.2.7 Setting the ENHANCE function
Enhances the picture presentation by narrowing the dynamic range of sonar video signals. Rotating
the ENHANCE control to the right causes the seabed and fish echoes to be displayed in dominant
colors like red, orange, yellow, etc. for better recognition. Rotating the control to the right causes the
shades of colors to be widened for better definition of image colors.
NOTE: Before using this function, the MODE switch must be set to USER 1 position. To change the
dynamic range, refer to Para. 7.3 “Setting the Enhance effect”.
Figure 5.10 The effect of enhance control
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