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參數(shù)資料
| 型號： | HA12227F |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) |
| 中文描述： | 音頻信號處理器卡座（杜比B型錄音系統(tǒng)星期日） |
| 文件頁數(shù)： | 13/86頁 |
| 文件大小： | 491K |
| 代理商： | HA12227F |
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HA12226F/HA12227F
Rev.6, Dec. 2000, page 13 of 86
The Sensitivity of Music Sensor
A standard level of MS input pin 25.9 mVrms, therefore, the sensitivity of music sensor (S) can request
it, by lower formulas.
A = MS Amp Gain*
1
B = PB input Gain
×
(1/2)*
2
C = Sensed voltage
20log (A
×
B) = D [dB]
C = 130 [mVrms] (Intenally voltage in a standard)
PB input Gain = 21.3 [dB]
Notes: 1. When there is not a regulation outside.
2. Case of one-sided channel input.
But necessary to consider the same attenuation quantity practically, on account of A(B) have made
frequency response.
S = 20log
S = 14
D [dB]
[dB]
C
25.9
A
B
G
V
37.7dB
f1 =
f2 = 25k [Hz]
[Hz]
1
2
π
C16
50k
f1
f2
f
Figure 5 Frequency Characteristic of MSIN
Occasion of the external component of figure 4, f1 is 3.18 kHz.
Time constant of detection
Figure 6(1) generally shows that detection time is in proportion to value of capacitor C13. But, with
Attack*
Notes 2. Attack
: Non-music to Music
3. Recovery : Music to Non-music
2
and Recovery*
3
the detection time differs exceptionally.
C13
(1)
(2)
(3)
R13
Recovery
D
D
Recovery
Recovery
Attack
Attack
Attack
D
Input level
Detection level
Figure 6 Function Characteristic of MS
Like the figure 6(2), Recovery time is variably possible by value of resistor R13. But Attack time gets
about fixed value. Attack time has dependence by input level. When a large signal is inputted, Attack time
is short tendency.
相關PDF資料 |
PDF描述 |
|---|---|
| HA12226F | Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) |
| HA12228F | Audio Signal Processor for Car Deck(Decode only Dolby B-type NR with PB Amp.) |
| HA12229F | Audio Signal Processor for Car Deck(Decode only Dolby B-type NR with PB Amp.) |
| HA12230 | Audio Signal Processor for Cassette Deck |
| HA12230NT | Audio Signal Processor for Cassette Deck |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HA12228F | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Car Deck(Decode only Dolby B-type NR with PB Amp.) |
| HA12228F/HA12229F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HA12229F | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Audio Signal Processor for Car Deck (Decode only Dolby B-type NR* with PB Amp.) |
| 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 |
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