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參數(shù)資料
| 型號(hào)： | CXA1580Q |
| 廠商： | Sony Corporation |
| 英文描述： | Dolby B Type Noise Reduction System with Playback Equalizer(杜比B型降噪聲系統(tǒng)（帶回放均衡器）) |
| 中文描述： | 杜比B型降噪系統(tǒng)（杜比乙型降噪聲系統(tǒng)的播放均衡器（帶回放均衡器）） |
| 文件頁(yè)數(shù)： | 12/17頁(yè) |
| 文件大小： | 249K |
| 代理商： | CXA1580Q |
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CXD1580Q
(3) Adjustment of playback equalizer
Fig. 3
1) Adjustment of EQ curve gain difference (= adjustment of internal variable R)
→
E IREF resistor
The internal variable resistor Ri should be adjusted to adjust the EQ curve gain differences (G1-G2), (G1-
G3). Therefore, adjust the external resistor R4 for E IREF pin.
2) AC gain adjustment
→
External resistor R1
The external resistor R1 should be adjusted to adjust the AC gain. G1, G2 and G3 are obtained by the
following equations.
[AC gain can be also adjusted by attaching VR to PBOUT pin, fixing R1. However, the low-band cut-off
frequency can be more lowered by R1 adjustment method with the same C1 value used for this method.]
3) Low-band cut-off frequency
→
External resistor R1 and external capacitor C1
The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external capacitor
C1.
R1
C2
C1
PBFB
3
2
PBTC
PBOUT
R3
E IREF
R4
1
G1
G2
G3
PBIN
F
R
Ri
3
2
1
fc
Fig. 4
R1+R3
R1
R1+Ri
R1
G1=20log
G2=G3=20log
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