HA12163 Hitachi Semiconductor, HA12163 Datasheet - Page 19

• Manufacturer Part Number: HA12163
• Description: Audio Signal Processor for Car Deck and Cassette Deck (Dolby B-type NR with PB Amp)
• Manufacturer: Hitachi Semiconductor

7. The Sensitivity Adjustment of a Music Sensor
[dB]
Gv
Adjusting MS AMP gain by external resistor, the sensitivity of music sensor can set up.
Gv1
Gv2
X1
X1
TAI (L)
–6 dB
TAI (R)
10
L·R signal addition circuit
MS
V
+
–
REF
26 dB
C28
4700 p
100
R28
R26
Figure 4 Music Sensor Block Diagram
f
25 kHz
1
LPF
Figure 5 Frequency Response
FFI
NOI
MS AMP.
+
–
R27
R25
f
1 k
Normal speed
f
[Hz]
FF or REV
C14
0.01
MA
OUT
3
R24
330 k
MSI MS
100 k
V
DET
CC
DET
+
Rev.4, Jun. 1999, page 19 of 66
C13
0.33
MS OUT
10 k
D GND
HA12163 Series
DV
25 k
D GND
Microcomputer
CC
f
f
R
2
4
I
L
L
100 k