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參數(shù)資料
| 型號： | HA12199F |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Audio Signal Processor for Car Deck(Decode only Dolby B-type NR with PB Amp.) |
| 中文描述： | 音頻信號處理器。為汽車甲板（只解碼杜比B型鉛放大器星期日） |
| 文件頁數(shù)： | 15/89頁 |
| 文件大小： | 517K |
| 代理商： | HA12199F |
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HA12192F/HA12197F/HA12212F Series
Rev.5, Jun. 1999, page 15 of 89
Music Sensor Time Constant
(1) Sensing no signal to signal (Attack) is determined by C6.
0.01
μ
F to 1
μ
F capacitor C6 can be applicable.
Sensing no signal to signal = C6
×
45000 (sec)
(2) Sensing signal to no signal (Recovery) is determined by C6 and R11, however preceding (1), 100k
to
1M
R11 can be applicable.
Sensing signal to no signal = C6
×
R11 (sec)
Music Sensor Output (MSOUT)
As for the internal circuit of music sensor block, music sensor output 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 1V)
Note:
Supply voltage of MSOUT pin must be less than V
CC
voltage.
The Tolerances of External Components for Dolby NR-Block (Only HA12192F Series)
For adequate Dolby NR tracking response, take external components shown below.
BIAS
DET(R)
DET(L)
C10
0.1
μ
F
±
10%
C4
0.1
μ
F
±
10%
R8
18k
±
2%
HA12192F series
16
6
5
Figure 6 Tolerance of External Components
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