HA12163 Datasheet, PDF (19/66 Pages) Hitachi Semiconductor – Audio Signal Processor for Car Deck and Cassette Deck (Dolby B-type NR with PB Amp)

HA12163 Series
7. The Sensitivity Adjustment of a Music Sensor
Adjusting MS AMP gain by external resistor, the sensitivity of music sensor can set up.
C14
V_CC
R28
R27 0.01 µ
DV_CC
R24
+ _C13
R26
R25
330 k
0.33 µ
C28
I_L
4700 p
TAI (L)
X1
MS
V_REF
FFI NOI
MA MSI MS
OUT
DET
R_L
L·R signal addition circuit
–6 dB
+
–
26 dB
LPF
25 kHz
+
–
MS AMP.
DET
MS OUT
D GND
Microcomputer
X1
TAI (R)
100 k
D GND
Figure 4 Music Sensor Block Diagram
Gv1
Gv
[dB]
Gv2
f₁
f₂
Normal speed
f₃
f₄
FF or REV
10
100
1k
10 k
25 k
100 k
f [Hz]
Figure 5 Frequency Response
Rev.4, Jun. 1999, page 19 of 66