Sony DVP-M35 Operation Manual page 14

Theinputsignal t o IC006DIP_ andDIN_) is a signal p rocessed afterEQ block
mentioned l ater.
"1: SingleLayerdisc *2: DualLayerdisc *3: Peak to Peak Differential
(3) EQblock
TheEQblockis a programmable equalizer filter differentiator block.
TheDVD formatis premised o n theEQ andrequires h ighfrequency signals tobe
boosted. Thisblockequalizes RFsignal t ogetoptimum RFsignal b ycombining L PF
and-EQ (boost), asshown in Figure 2-4. LPFisdefined as-3dBband widthwithout
boost. I f theamount o fboost i s settoacertain value, t hegainatcut-offfrequency i s
asfollows:
Gain(atcut-offfrequency) = -3dB+ Boostamount [ dB]
Also,LPFis usedasaprefilterfortheA/D converter p rovided in theinputstage of
RFblockof IC in thepoststage (MB78board IC770).
wl
v
_z
10
-5
-10
-15
0
t
1 2 3 4 5 6 7 8 9 10
FREQUENCY (MHz)
---e.--- LPF+EQ
--D-- LPF
Figure 2-4. Frequency characteristics (EQ+LPF)
These cut-off frequency and boost amount of LPF are operated by the command
register set via serial interface.
The RF signal processed in this block is output from IC006 FNP_ and FNN(_). This
signal is entered to IC006 DIP_ and DIN(_) and rectified in full wave, then compared
in the AGC block. The RF signal output from IC006 SIG(_ is then transmitted to the
RF signal processing block IC806 in the post stage.
- 17 -