參數(shù)資料
型號(hào): AK4648
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): 56/119頁
文件大小: 1272K
代理商: AK4648
[AK4648]
MS0625-E-01
2007/06
- 56 -
De-emphasis Filter
The AK4648 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 36).
DEM1
DEM0
0
0
0
1
1
0
1
1
Table 36. De-emphasis Control
5 Band Equalizer
The AK4648 has 5 Band Equalizer on DAC block. The center frequencies and cut/boost amount are selected by
FBEQx3-0 bits (Table 37).
Center frequency: 100Hz, 250Hz, 1kHz, 3.5kHz, and 10kHz (Note 56, Note 57)
Cut/Boost amount: Minimum –10.5dB, Maximum +12dB, Step 1.5dB
Note 56: These are the frequencies when the sampling frequency is 44.1kHz. These frequencies are proportional to the
sampling frequency.
Note 57: 100Hz is not center frequency but the frequency component lower than 100Hz is controlled.
Note 58: 10kHz is not center frequency but the frequency component higher than 10kHz is controlled.
FBEQ bit controls ON/OFF of this Equalizer.
FBEQA3-0: Select the boost level of 100Hz
FBEQB3-0: Select the boost level of 250Hz
FBEQC3-0: Select the boost level of 1kHz
FBEQD3-0: Select the boost level of 3.5kHz
FBEQE3-0: Select the boost level of 10kHz
FBEQx3-0
0H
1H
2H
3H
:
8H
:
DH
EH
FH
Table 37. Boost amount of 5 Band Equalizer
Mode
44.1kHz
OFF
48kHz
32kHz
(default)
Boost amount
+12.0dB
+10.5dB
+9.0dB
+7.5dB
:
0dB
:
7.5dB
9.0dB
10.5dB
(default)
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