參數(shù)資料
型號: AK4642EN
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/HP/SPK-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù): 41/83頁
文件大?。?/td> 670K
代理商: AK4642EN
ASAHI KASEI
[AK4642EN]
MS0420-E-00
2005/09
- 41 -
De-emphasis Filter
The AK4642 includes the digital de-emphasis filter (tc = 50/15
μ
s) by IIR filter. Setting the DEM1-0 bits enables the
de-emphasis filter (Table 29).
DEM1
DEM0
0
0
0
1
1
0
1
1
Table 29. De-emphasis Control
Bass Boost Function
The BST1-0 bits control the amount of low frequency boost applied to the DAC output signal (Table 30). If the BST1-0
bits are set to “01” (MIN Level), use a 47
μ
F capacitor for AC-coupling. If the boosted signal exceeds full scale, the analog
output clips to the full scale. Figure 26 shows the boost frequency response at –20dB signal input.
Mode
44.1kHz
OFF
48kHz
32kHz
Default
Boost Filter (fs=44.1kHz)
-5
0
5
10
15
20
10
100
1000
10000
Frequency [Hz]
L
MAX
MID
MIN
Figure 26. Bass Boost Frequency Response (fs=44.1kHz)
BST1
0
0
1
1
BST0
0
1
0
1
Mode
OFF
MIN
MID
MAX
Default
Table 30. Bass Boost Control
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