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參數(shù)資料
| 型號(hào)： | HA12237F |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | Audio Signal Processor for Cassette Deck |
| 中文描述： | 音頻信號(hào)處理器卡座 |
| 文件頁數(shù)： | 14/39頁 |
| 文件大?。?/td> | 316K |
| 代理商： | HA12237F |
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HA12237F
Rev.0, Feb. 2002, page 12 of 12
ALC
(Automatic Level Control)
ALC is the input decay rate variable system. It has internal variable resistors of pin 8 (pin 23) by REC
signal that is inputted to pin 7 (pin 24).
Pin 17 is detector pin.
The signal input pin is pin 7 (pin 24). Resistor R1, R2 and capacitor C2, external components, for the input
circuit are commended as figure 4. There are requested to use value of the block diagram figure for
performance maintenance of S/N, T.H.D. etc.
Figure 5 shows the relation with R1 and C1 front input point and RECOUT.
ALC operation level acts for the center of +4.5 dB to standard level (453 mVrms).
Then, adopted maximum value circuit, ALC is operated by a large channel of signal.
ALC ON/OFF can switch it by pin 11. Please do ALC ON, after it does for one time ALC OFF inevitably,
for ALC time to start usefully, in order to reset ALC circuit.
453 mV
4.5 dB
R
Figure 5 ALC Operation Level
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