HA12203NT Datasheet, PDF (12/97 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)

HA12203NT/HA12204NT
The Sensitivity Adjustment of Music Sensor
Adjusting MS Amp gain by external resistor, the sensitivity of music sensor can set up.
REP
PB (L)
–6dB
V_CC
C17 _R18
1000p _330k
+ _C16
0.33µ
D V_CC
8.2k
LPF
25kHz
MAI
MA MSIN MS
R_L
100k
OUT
DET
–
+
MS AMP
DET
50k
MS OUT
GND
Microcomputer
GND
PB (R)
Figure 4 Music Sensor Block Diagram
The Sensitivity of Music Sensor
Gv
f1 =
1
[Hz]
2π • C17 • 50k
f2 = 25k [Hz]
f
f1
f2
Figure 5 Frequency Characteristic of MSIN
Occasion of the external component of figure 4, f1 is 3.18 kHz.
Rev.3, Jun. 1999, page 12 of 97