Khz Low Pass Filter - Toshiba CN27E90 Technical Training Manual

11. 7 kHz LOW PASS FILTER

The DSP outputs are received at inputs of high impedance
voltage followers and then fed to 7 kHz LPFs. Since L and
R components of the DSP output are processed in time
sharing by the D/A converter, the LO and RO outputs must
be received at the high impedance input circuits. The LPFs
which receives the signals consist of OP amplifiers.
QD03
CD32
1m 50V
DSP
7
LO
CD26
RD31
33P
RD34
DSP
8
RO
CD34
1m50V
CD25
33P
QD05
3
1
2
1M
REF
1M
QD06
5
7
6
RD30 RD29
RD28
10K
10K
10K
CD30
CD31
820P
M3300P
RD47 RD46
RD45
10K 10K
10K
CD19
CD18
M2700P
390P
Fig. 15-12
119
CD39
M5600P
QD05
5
7
6
CD17
M6800P
QD06
3
1
2
Front
(Addition circuit)
Rear
(Dolby NR circuit)