Furuno FAR-2107 Series Service Manual page 384

- WIPER-1
The input signal is computed using the wiper coefficient K and the signal level is
gradually reduced. The smaller is the signal level, the smaller the wiper coefficient
is. Consequently, weaker signals disappear quicker than stronger signals.
n+1
- WIPER-2
The processing of WIPER-2 operates basically in the same way as for WIPER-1
processing. However, wiper processing and EAV is performed in parallel and the
wiper processing is performed so that final echoes level is same level as EAV only
is used. For instance, if the echo level is set as medium level input in the EAV-2
setting and they are continuous echoes, the wiper-processed echo of the final block
is emphasized more than the previous echo.
Time
1
2
1
3
2
4
3
4
n+1
Table 7.3.10 WIPER-1 processing
7-40
7.3 Processor Unit: RPU-013
Signal Level:S
S x K1=S1
S1 x K2=S2
1.0
K
S2x K3=S3
0
Signal Level