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參數(shù)資料
| 型號(hào)： | HA12209 |
| 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(hào)處理器卡座（杜比B型錄音系統(tǒng)星期日） |
| 文件頁(yè)數(shù)： | 11/49頁(yè) |
| 文件大?。?/td> | 279K |
| 代理商： | HA12209 |
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HA12209F
Rev.2, Jun. 1999, page 11 of 49
The sensitivity of Music Sensor
Gv
f1 =
f2 = 25k [Hz]
[Hz]
1
2
π
·
C26
·
100k
f1
f2
f
Figure 5 Frequency Characteristic of MSIN
Occasion of the external component of figure 4, f1 is 159Hz. A standard level of MS input pin
25.9mVrms, therefore, the sensitivity of music sensor (S) can request it, by lower formulas.
A = MS Amp Gain
B = PB input Gain
×
(1/2)*
1
C = Sensed voltage
20log (A
×
B) = D [dB]
PB input Gain = 21.3 [dB]
Note: 1. Case of one-sided channel input.
S = 20log
S = 14
–
D [dB]
[dB]
C
25.9
·
A
·
B
Time Constant of Detection
Figure 6(1) generally shows that detection time is in proportion to value of capacitor C10. But, with
Attack*
2
and Recovery*
3
the detection time differs exceptionally.
C10
Function Characteristic of MS (1)
Function Characteristic of MS (2)
Function Characteristic of MS (3)
R12
Recovery
D
D
Recovery
Recovery
Attack
Attack
Attack
D
Input level
Detection level
Figure 6 Function Characteristics of MS
Like the figure 6(2), Recovery time is variably possible by value of resistor R12. 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.
Note: 2. Attack :
3. Recovery : Music
→
Non-music
Non-music
→
Music
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| HA12209F | Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) |
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相關(guān)代理商/技術(shù)參數(shù) |
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| HA12209F | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) |
| HA12211 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck (Deck 1 Chip) |
| HA12211NT | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:Audio Signal Processor for Cassette Deck (Deck 1 Chip) |
| HA12212F | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:Audio Signal Processor for Car Deck(Decode only Dolby B-type NR with PB Amp.) |
| HA12215 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) |
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