Panasonic KX-B620 - Page 48

KX-B620. Series
KX-B520. Series
2-5 Shading Correcting Circuit
1) Function
In this circuit video signal distortion called shading which is caused by the difference of the
sensitivity of each photo sensor in CCD and the optical system distortion is compensated.
This is accomplished by the LSI (1C109) and the memory (1C110) .
2) Circuit Operation
Circuit Diagram and the Block Diagram of LSI (iC109) are shown below.
1c109
vec MNGGIS1
OVF/DS-5
OVF/DB=¢
OVF/DB-3
OVF/DB-2
OVF/DB-1
OvF/DB-0
Selector
ss
ow,
6
7 Piero p> | eR
:
Selector
RA O~11
R/W
MOE RAM ofr ROM
Fig. 21 Circuit Diagram and Block Diagram of 1C109