Sony DVP-M35 Operation Manual page 14

The input signal to ICOO DIP@ and DIN@ is a signal processed after EQ block
mentioned later.
* 1: Single Layer disc
(3) EQ block
The EQ block is a programmable equalizer filter differentiator block.
The DVD format is premised on the EQ and requires high frequency signals to be
boosted. This block equalizes RF signal to get optimum RF signal by combining LPF
and EQ (boost), as shown in Figure 2-4. LPF is defined as -3dB band width without
boost. If the amount of boost is set to a certain value, the gain at cut-off frequency is
as follows:
Gain (at cut-off frequency) = -3dB + Boost amount [dB]
Also, LPF is used as a prefilter for the A/D converter provided in the input stage of
RF block of IC in the post stage (MB78 board IC770).
1 0
5
0
-5
-10
-15
0 1 2
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 ICOO FNP@ and FNN@. This
signal is entered to ICOO DIP@ and DIN@ and rectified in full wave, then compared
in the AGC block. The RF signal output from ICOO SIG@ is then transmitted to the
RF signal processing block IC806 in the post stage.
3 4 6
5
FREQUENCY (MHz)
9 1 0
7 8