HA12215 Hitachi Semiconductor, HA12215 Datasheet - Page 11

• Manufacturer Part Number: HA12215
• Description: Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
• Manufacturer: Hitachi Semiconductor

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.
With the capacity C2 capacitance that we showed for figure 2 70 s by the way figure seem to 3 they are
decided.
The Sensitivity Adjustment of Music Sensor
Adjusting MS Amp gain by external resistor, the sensitivity of music sensor can set up.
PB (R)
PB (L)
REP
6dB
G
V
Figure 3 Frequency Characteristic of PB Equalizer
25kHz
8.2k
LPF
Figure 4 Music Sensor Block Diagram
t1
MAI
100k
+
MS AMP
t2
1000p
MA
OUT
C16
MSIN
50k
330k
R13
DET
V
f
CC
t1 = C2 (12k + 15k)
t2 = C2 15k
MS
DET
+
C13
0.33
MS OUT
Rev.5, Oct. 1999, page 11 of 69
GND
D V
Microcomputer
GND
CC
R
HA12215F
L