HA12226F Datasheet, PDF (12/86 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)

HA12226F/HA12227F
PB Equalizer
By switching logical input level of pin 17 (for Ain) and pin 19 (for Bin), you can equalize corresponding to
tape position at play back mode.
G_V
t1
t2
t1 = C2 ⋅ (12k + 15k)
t2 = C2 ⋅ 15k
f
Figure 3 Frequency Characteristic of PB Equalizer
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
C16 _R13
1000p _330k
+ _C13
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
Rev.6, Dec. 2000, page 12 of 86