ak4671 AKM Semiconductor, Inc., ak4671 Datasheet - Page 73

• Manufacturer Part Number: ak4671
• Description: Stereo Codec With Mic/rcv/hp-amp
• Manufacturer: AKM Semiconductor, Inc.

■
The AK4671 has 5-Band Equalizer before DAC of Stereo CODEC.
The center frequencies and cut/boost amount are the followings.
Note 62. These are the frequencies when the sampling frequency is 44.1kHz. These frequencies are proportional to the
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
MS0666-E-00
• Center frequency: 100Hz, 250Hz, 1kHz, 3.5kHz and 10kHz
• Cut/Boost amount: –10.5dB ∼ +12dB, 1.5dB step
5-Band Equalizer
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
sampling frequency.
Table 35. Boost amount of 5-Band Equalizer
Table
EQx3-0
DH
EH
0H
1H
2H
3H
8H
FH
:
:
35.
Boost amount
- 73 -
+12.0dB
+10.5dB
− 10.5dB
+9.0dB
+7.5dB
− 7.5dB
− 9.0dB
0dB
:
:
(Note
62,
Note
(default)
63,
Note
64)
[AK4671]
2007/10