[AK4675]
■ 5-Band Equalizer
The AK4675 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, 10kHz (Note 80, Note 81, Note 82)
• Cut/Boost amount: –10.5dB ∼ +12dB, 1.5dB step
Note 80: These are the frequencies when the sampling frequency is 44.1kHz. These frequencies are proportional to the
sampling frequency.
Note 81: 100Hz is not center frequency but the frequency component lower than 100Hz is controlled.
Note 82: 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
0H
1H
2H
3H
:
Boost amount
+12.0dB
+10.5dB
+9.0dB
+7.5dB
:
8H
:
0dB
:
(default)
DH
EH
FH
−7.5dB
−9.0dB
−10.5dB
Table 35. Boost amount of 5-Band Equalizer
MS0963-E-00
2008/05
- 82 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
