[AKD7756-HF]
<KM101400>
2010/06
- 8 -
■
Parametric Equalizers
The parametric equalizers as follows are included in HF code.
Name Function
CRAM
Address
Receiving-PEQ
Filter for receiving sound
4-band IIR
1st Band:(1C4h) ~ (1C8h)
2nd Band:(1C9h) ~ (1CDh)
3rd Band:(1CEh) ~ (1D2h)
4th Band:(1D3h) ~ (1D7h)
Sending-PEQ
Filter for transmitting sound
8-band (4+4) IIR
1st Band:(1D8h) ~ (1DCh)
2nd Band:(1DDh) ~ (1E1h)
3rd Band:(1E2h) ~ (1E6h)
4th Band:(1E7h) ~ (1EBh)
5th Band:C(478h) ~ C(47Ch)
6th Band:C(47Dh) ~ C(481h)
7th Band:C(482h) ~ C(486h)
8th Band:C(487h) ~ C(48Bh)
MIC-Comp-PEQ
Spatial distortion correction filter
2-band IIR fixed
4-band IIR variable
Fix Band:C(399h) ~ C(39Dh)
Fix Band:C(39Eh) ~ C(3A2h)
1st Band:C(1ECh) ~ C(1F0h)
2nd Band:C(1F1h) ~ C(1F5h)
3rd Band:C(1F6h) ~ C(1FAh)
4th Band:C(1FBh) ~ C(1FFh)
MIC_IN_PEQ
MIC Filter
2-band IIR fixed
4-band IIR variable
Fix Band:C(3A4h) ~ C(3A8h)
Fix Band:C(3A9h) ~ C(3ADh)
1st Band:C(214h) ~ C(218h)
2nd Band:C(219h) ~ C(21Dh)
3rd Band:C(21Eh) ~ C(222h)
4th Band:C(223h) ~ C(227h)
SPK_OUT_PEQ
Speaker Output Filter
8-band (4+4) IIR
1st Band:C(3B1h) ~ C(3B5h)
2nd Band:C(3B6h) ~ C(3BAh)
3rd Band:C(3BBh) ~ C(3BFh)
4th Band:C(3C0h) ~ C(3C4h)
5th Band:C(200h) ~ C(204h)
6th Band:C(205h) ~ C(209h)
7th Band:C(20Ah) ~ C(20Eh)
8th Band:C(20Fh) ~ C(213h)
Table 3. HF PEQ tables
5 types of filters can be selected on GUI software.
Type Name
DIP
Boost and decompress for specific frequency
LPF12
Low Pass Filter 12dB/oct
HPF12
High Pass Filter 12dB/oct
LPF6
Low Pass Filter 6dB/oct
HPF6
High Pass Filter 6dB/oct
Table 4. Filter attribute table
