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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)： | 20/24頁 |
| 文件大小： | 392K |
| 代理商： | LC75421M |
No. 6866-20/24
LC75421M
(4) Bass Peaking Circuit
The equivalent circuit and the formula for calculating the external RC with a mean frequency of 100 Hz are shown
below.
Bass band equivalent circuit diagram
Calculation example
Specification Mean frequency: f0 = 100 Hz
Gain during maximum boost: G = 11.9 dB
Let us use R1 = 0, R2 = 45.084 k
, and C1 = C2 = C.
We obtain R3 from G = 11.9 dB.
We obtain C from mean frequency f0 = 100 Hz.
We obtain Q.
C1
C2
R1
R2
R3
G
+11.9
dB
=
20
×
LOG
10
1
+
R
2
2
R
3
R
3
=
R
2
2 10
11.9dB
/20
–1
45084
2
×
(3.936 – 1)
=
≠
7.68
K
f
0
=
R
3
R
2
C
1
C
2
1
2
π
C
=
=
1
2
π
f
0
R
3
R
2
1
2
π
×
100 45084
×
7680
≠
0.082
μ
F
Q
=
R
3
R
2
R
3
R
2
2
R
3
1
≠
1.66
Simulation Results
Setting
f = 100 Hz
f = 1 kHz
11.9 dB
11.88
0.00
10.2 dB
10.38
0.00
8.5 dB
8.79
0.00
6.8 dB
7.14
0.00
5.1 dB
5.42
0.00
3.4 dB
3.66
0.00
1.7 dB
1.85
0.00
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