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參數(shù)資料
| 型號(hào)： | LC75421M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Electronic Volume Controller for Cars |
| 中文描述： | 汽車電子音量控制器 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大小： | 392K |
| 代理商： | LC75421M |
No. 6866-18/24
LC75421M
Bass Shelving Circuit
The equivalent circuit and calculation formula during boost are shown below.
Bass band equivalent circuit diagram
Calculation example 1
Specification Mean frequency: f0 = 40 Hz
Gain during maximum boost: G
+ 14 dB
= 14 dB
Let us use R1 = 0 k
, R2 = 45.054 k
, C1 = 2.2 μF, and C1 >> C2.
We obtain R3 from G = 14 dB.
We obtain C2 from mean frequency f0 = 40 Hz.
R1
R2
R3
C1
C2
G
+14
dB
=
20
×
LOG
10
R
2
+
R
3
R
3
R
3
=
R
2
10
G
/20
–1
45054
5.01 – 1
=
≠
11
K
f
0
=
R
3
R
2
C
1
C
2
1
2
π
C2
=
=
1
(2
π
f
0)
2
R
2
R
3
C
1
1
(2
π
×
40)
2
×
45054
×
11000
×
(2.2
×
10
–6
)
≠
0.015
μ
F
Simulation Results
Setting
f = 100 Hz
f = 1 kHz
14 dB
13.55
3.65
12 dB
11.73
3.51
10 dB
9.8
3.31
8 dB
7.89
3
6 dB
5.94
2.55
4 dB
3.97
1.92
2 dB
1.99
1.07
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