參數(shù)資料
型號: AK4646EZ
廠商: ASAHI KASEI POWER DEVICES CORP
元件分類: 消費家電
英文描述: Stereo CODEC with MIC/SPK-AMP
中文描述: SPECIALTY CONSUMER CIRCUIT, PQCC32
封裝: 4 X 4 MM, 0.40 MM PITCH, LEAD FREE, PLASTIC, QFN-32
文件頁數(shù): 36/78頁
文件大?。?/td> 808K
代理商: AK4646EZ
[AK4646EZ]
MS0630-E-00
2007/06
- 36 -
(4)
Gain Compensation (EQ0)
Gain Compensation is used to compensate the frequency response and the gain that is changed by Stereo Separation
Emphasis Filter. Gain Compensation is composed of the Equalizer (EQ0) and the Gain (0dB/+12dB/+24dB). E0A15-0,
E0B13-0 and E0C15-0 bits set the coefficient of EQ0. GN1-0 bits set the gain (Table 22). EQ0 bit controls ON/OFF of
EQ0. When EQ is OFF and the gain is 0dB, the audio data passes this block by 0dB gain. The coefficient should be set
when EQ0 bit = “0” or PMADL=PMADR= PMDAC bits = “0”.
fs: Sampling frequency
fc
1
: Pole frequency
fc
2
: Zero-point frequency
K: Filter gain [dB] (Maximum +12dB)
Register setting (Note 36)
E0A[15:0] bits =A, E0B[13:0] bits =B, E0C[15:0] bits =C
(MSB=E0A15, E0B13, E0C15; LSB=E0A0, E0B0, E0C0)
1 + 1 / tan (
π
fc
2
/fs)
B =
1 + 1 / tan (
π
fc
1
/fs)
A = 10
K/20
x
1 + 1 / tan (
π
fc
1
/fs)
1
1 / tan (
π
fc
1
/fs)
,
C =10
K/20
x
1
1 / tan (
π
fc
2
/fs)
1 + 1 / tan (
π
fc
1
/fs)
,
Transfer function
H(z) =
A + Cz
1
1 + Bz
1
Gain[dB]
K
fc
1
fc
2
Frequency
Figure 28. EQ0 Frequency Response
GN1
0
0
1
Table 22. Gain select of gain block (x: Don’t care)
GN0
0
1
x
Gain
0dB
+12dB
+24dB
(default)
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