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參數(shù)資料
| 型號： | HA12206NT |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Audio Signal Processor for Cassette Deck |
| 中文描述： | 音頻信號處理器卡座 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大小： | 180K |
| 代理商： | HA12206NT |
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HA12206NT
Rev.3, Jun. 1999, page 13 of 32
Music Sensor Output (MSOUT)
Because MS out pin is connected to the collector of NPN type directly, it is requested to use pull up resistor
(RL=10k to 22k
)
Output level is “High” sensing no signal. And output level is “Low” sensing signal.
Please take notice of MS Low level voltage (GND+0.9V).
The connected supply voltage must be less than V
CC
voltage, with MSOUT pull up resistor.
Automatic Level Control (ALC)
ALC is the input decay rate variable system.
It has internal variable resistors of pin6 (pin25) by RECOUT signal that is inputted to pin8 (pin23).
The operation is similitude to MS, detected by pin15.
The signal input pin is pin5 (pin26). Resistor R1, R2 and capacitor C2, external components, for the input
circuit are commended as figure 6. These 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 front REC IN point and RPOUT.
ALC operation level is 775mVrms {standard level (580mVrms) +2.5dB}. And it is designed to operate
from 0dB to +15dB as 775mVrms=0dB.
Adopted maximum value circuit, ALC is operated by a large channel of a signal.
ALC on/off is linked with REC mute. When REC mute is on, ALC is off.
R
RECIN
580mV
775mV
2.5dB
15dB
Figure 5 ALC Operation Level
5
R2
R1
24.5mV
27.5dB
ATT
ADDIN
V
CC
DETALC
C4
Input
Output
RECIN
C2
RPOUT
580mV
6
ALC
R7
C7
+
7
8
15
Figure 6 ALC Block Diagram
REC-Equalizer
REC mute is located at input-part of REC-equalizer. Therefore it has realized low pop noise.
But because there is deference DC offset at the each mode of REC-equalizer, it is necessary for a coupling
capacitor between EQOUT pin and recording head.
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