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參數(shù)資料
| 型號(hào)： | HA12215 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | HEATSHRINK, 1/8" ALPHA, FIT 221 1/8 |
| 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)： | 15/69頁(yè) |
| 文件大?。?/td> | 389K |
| 代理商： | HA12215 |
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HA12215F
Rev.5, Oct. 1999, page 15 of 69
BIAS (N)
Pin 33
BIAS (M)
Pin 31
R22
V
EE
Vbias
R21
R19
BIAS (C)
Pin 32
R20
Figure 10 External Components of Bias Block
Automatic Level Control
ALC is the input decay rate variable system. It has internal variable resistors of pin 55 (pin 44) by
RECOUT signal that is inputted to pin 9 (pin 34).
The operation is similitude to MS, detected by pin 13.
The signal input pin is pin 56 (pin 43). Resistor R1, R2 and capacitor C2, external components, for the
input circuit are commended as figure 12. There are requested to use value of the block diagram figure for
performance maintenance of S/N, T.H.D. etc.
Figure 11 shows the relation with R1 front RIN point and ROUT.
ALC operation level acts for the center of +4.5 dB at tape position TYPE I, IV and the center of +2.5 dB at
tape position TYPE II, to standard level (300 mVrms).
Then, adopted maximum value circuit, ALC is operated by a large channel of a signal.
ALC ON/OFF can switch it by pin 15. Please do ALC ON, after it does for one time ALC OFF inevitably,
for ALC time to start usefully (when switching PB
→
PASS, when switching PB
→
PASS), in order to
reset ALC circuit.
RIN
TYPE
II
2.5dB
300mV
R
TYPE
I
,
IV
4.5dB
Figure 11 ALC Operation Level
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HA12215F | Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) |
| HA12217F | Audio Signal Processor for Car Deck(Decode only Dolby B type NR with PB Amp.) |
| HA12216F | Audio Signal Processor for Car Deck(Decode only Dolby B type NR with PB Amp.) |
| HA12218F | Audio Signal Processor for Car Deck(Decode only Dolby B type NR with PB Amp.) |
| HA12221F | Audio Signal Processor for Car Deck(Decode only Dolby B type NR with PB Amp.) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HA12215F | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) |
| HA12216F | 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.) |
| HA12216F/HA12221FSERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HA12217F | 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.) |
| HA12218F | 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.) |
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