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參數資料
| 型號： | HA12229F |
| 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： | 14/51頁 |
| 文件大?。?/td> | 304K |
| 代理商： | HA12229F |
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HA12228F/HA12229F
Rev.2, Dec. 2000, page 14 of 51
1. Search mode
G
V1
= 20dB + 20 log 1 +
[dB]
90k
REX2
f
1
=
[Hz], f
2
= 25k [Hz]
1
2
π
CEX2
REX2
2. Repeat mode
G
V2
= 20dB + 20 log 1 +
[dB]
90k
REX1
f
3
=
[Hz], f
4
= 25k [Hz]
1
2
π
CEX1
REX1
G
V
IA: L·R signal addition circuit gain.
The sensitivity of music sensor (S) is computed by the formula mentioned below.
S =
G
V
*
1
20 log
= 12.7
G
V
[dB]
130*
3
30*
2
Note: 1. Search mode: G
V1
, Repeat mode: G
V2
2. Standard level of TAI pin (Dolby level correspondence) = 30 mVrms
3. Standard sensing level of music sensor = 130 mVrms
Item
REX1, 2
CEX1, 2
G
V1, 2
33.5 dB
f
1, 3
663 Hz
f
2, 4
25 kHz
S
(one side
channel)
S
(both
channel)
Search mode
24 k
2.4 k
0.01
μ
F
1
μ
F
–14.8 dB
–20.8 dB
Repeat mode
Note:
51.7 dB
66.3 Hz
25 kHz
–33.0 dB
–39.0 dB
S is 6 dB down in case of one-side channel. And this MS presented hysteresis lest MSOUT terminal
should turn over again High level or Low level, in case of thresh S level constantly.
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.
2. Sensing signal to no signal (Recovery) is determined by C6 and R11, however preceding (1), 100 k
to
1 M
can be applicable.
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.
I
L
=
* MSOUT
LO
: Sensing signal (about 1V)
DV
CC
MSOUT
LO
*
R
L
Note: 1. Supply voltage of MSOUT pin must be less than V
CC
voltage.
相關PDF資料 |
PDF描述 |
|---|---|
| HA12230 | Audio Signal Processor for Cassette Deck |
| HA12230NT | Audio Signal Processor for Cassette Deck |
| HA12231 | Audio Signal Processor for Car Deck (PB 1 Chip) |
| HA12231FP | Audio Signal Processor for Car Deck (PB 1 Chip) |
| HA12232 | Audio Signal Pre-Amp. for Car Deck |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HA12230 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck |
| HA12230NT | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck |
| HA12231 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Car Deck (PB 1 Chip) |
| HA12231FP | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Car Deck (PB 1 Chip) |
| HA12232 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Pre-Amp. for Car Deck |
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