HA12179F Datasheet, PDF (17/40 Pages) Hitachi Semiconductor – Audio Signal Processer for Car Deck and Cassette Deck(Dolby B-type NR with PB Amp)

HA12179F
PB Equalizer for Double Speed
PB equalizer can be design for double speed by using external components shown in figure 8. Application
data is shown in figure 9.
4.7µ
+
R35
5.1k
No
0.015µ
R
Do
22k
VR1
0.1µ
+
R38
330k
EQ OUT
TAI
R36
12k
EQ OUT-M
R37
18k
C25
0.01µ
EQ AMP.
NFI
–+
RIN
VREF
No : Normal speed
Do : Double speed
PBOUT
INPUT AMP.
+
–
NR circuit
RECOUT
FIN
Note : Please adjust RECOUT level to
be Dolby level with volume of
VR1.
Figure 8 Application Circuit for Double Speed
Rev.1, Apr. 1994, page 17 of 40