AK4671_10 Datasheet, PDF (73/166 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/RCV/HP-AMP

[AK4671]
■ 5-Band Equalizer
The AK4671 has 5-Band Equalizer before DAC of Stereo CODEC.
The center frequencies and cut/boost amount are the followings.
• Center frequency: 100Hz, 250Hz, 1kHz, 3.5kHz and 10kHz (Note 62, Note 63, Note 64)
• Cut/Boost amount: –10.5dB ∼ +12dB, 1.5dB step
Note 62. These are the frequencies when the sampling frequency is 44.1kHz. These frequencies are proportional to the
sampling frequency.
Note 63. 100Hz is not center frequency but the frequency component lower than 100Hz is controlled.
Note 64. 10kHz is not center frequency but the frequency component higher than 10kHz is controlled.
EQ bit controls ON/OFF of this Equalizer and these Boost amount are set by EQA3-0, EQB3-0, EQC3-0, EQD3-0 and
EQE3-0 bits, respectively, as shown in Table 35.
EQA3-0: Select the boost level of 100Hz
EQB3-0: Select the boost level of 250Hz
EQC3-0: Select the boost level of 1kHz
EQD3-0: Select the boost level of 3.5kHz
EQE3-0: Select the boost level of 10kHz
EQx3-0
Boost amount
0H
+12.0dB
1H
+10.5dB
2H
+9.0dB
3H
+7.5dB
:
:
8H
0dB
(default)
:
:
DH
−7.5dB
EH
−9.0dB
FH
−10.5dB
Table 35. Boost amount of 5-Band Equalizer
MS0666-E-02
- 73 -
2010/06