Panasonic tc-22lh1 technical guide Service Manual

 

ll NTSC video signals are converted to digital data by the analog to digital (A/D) 

04 

he 

4004 outputs the data to the global core IC, IC4010 via the time base correction 

age 

 

Figure 15 

 
 
A
converter circuit located inside the Global Core IC, IC4004. The comb filter in IC40
converts the composite video signal of the main picture to Y and C separated video 
data. S-Video, which is already Y/C separated, simply bypasses the comb filter. The 
chroma information is then applied to the chroma demodulator circuit that separates t
color signal into Pb and Pr data. 
 
IC
circuit. IC4010 contains a line doubler circuit that halves the horizontal line period, 
doubling the horizontal frequency to 31.468KHz. Using IC4012 as a temporary stor
area, IC4010 then converts the digital signal scan format from interlaced to progressive 
and sends the 10 bit signal back to IC4004. 
 

 

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