HA12209F Datasheet, PDF (10/49 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)

HA12209F
PB Equalizer
By switching logical input level of 11 pin (for Ain) and 14 pin (for Bin), you can equalize corresponding to
tape position at play back mode.
With the capacity CEX1 capacitance that we showed for figure 2 70 µs by the way figure seem to 3 they
are decided.
Gv
(t1)
(t2)
t1 = CEX1 · (12k + 15k)
t2 = CEX1 · 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
C26
R12
0.01µ _330k
+ _C10
0.33µ
DV_CC
45k
LPF
25kHz
MAI
MA MSIN MS
R_L
100k
OUT
DET
–
+
MS AMP
DET
100k
MS OUT
GND
Microcomputer
GND
PB(R)
Figure 4 Music Sensor Block Diagram
Unit R : Ω
C:F
Rev.2, Jun. 1999, page 10 of 49