參數(shù)資料
型號(hào)： HA12179F
廠商： Hitachi,Ltd.
英文描述： Audio Signal Processer for Car Deck and Cassette Deck(Dolby B-type NR with PB Amp)
中文描述： 音頻信號(hào)加工者為汽車(chē)甲板和卡座（杜比B型鉛放大器星期日）
文件頁(yè)數(shù)： 15/40頁(yè)
文件大?。?/td> 259K
代理商： HA12179F
HA12179F
Rev.1, Apr. 1994, page 15 of 40
Normal mode
Gv1
=
20log 1
+
R27
R28
[dB]
f1
=
1
2
π
C14
100k[Hz],f2
=
25k[Hz]
FF or REW mode
Gv2
=
20log 1
+
R25
1
2
π
C28
R26[Hz],f4
=
25k [Hz]
A standard level of TAI pin is 30 mVrms and the gain for TAI to MS AMP input is 10times, therefore, the
other channel sensitivity of music sensor (S) is computed by the formula mentioned below.
R26
[dB]
f3
=
S
=
20log
C
30
1
10
A
[dB]
A = MS AMP. gain (B dB)
C = The sensing level of music sensor
S
=
–7.3– B[dB]C
=
130mVrms(typ.)
S is 6 dB up in case of the both channels.
Music Sensor Time Constant
Sensing no signal to signal (Attack) is determind by C13.
0.01 μF to 1 μF capacitor C13 can be applicable.
Sensing signal to no signal (Recovery) is determind by C13 and R24, however preceding (Attack), 100
k
to 1 M
R24 can be applicable.
Music Sensor Output (MS OUT)
As for the internal circuit of music sensor block, music sensor out pin is connected to the collector of NPN
Type directly, therefore, output level will be “high” when sensing no signal. And output level will be
“l(fā)ow” when sensing signal.
Connection with microcomputer, design I
L
at 1mA typ.
I
L
=
DV
CC
–MSOUT
Lo
*
R
L
* MSOUT
LO
: Sensing signal (about 1 V)
Notes: 1. Supply voltage of MS OUT pin must be less than V
CC
voltage.
2. MS V
CC
pin and V
CC
pin are required the same voltage.
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