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| AK4564 Datasheet, PDF (26/48 Pages) Asahi Kasei Microsystems – 16BIT CODEC WITH BUILT-IN ALC AND MIC/HP/SPK-AMP | |||
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ASAHI KASEI
[AK4564]
n Digital EQ/HPF/LPF Circuits
The AK4564 performs equalizing, filtering and ALC (Automatic Level Control) by digital domain for A/D converter
data. The equalizing circuit emphasizes stereo separation when using internal microphone. LPF1, LPF2 and HPF2 are IIR
filters of 1st order to compensate frequency response of microphone and etc. HPF3 is IIR filter of 2nd order to cut a
wind-noise. Refer to the section of âALC1 operationâ about ALC1.
Lch
HPF3
LPF1
LPF2
HPF2
Main
HPF1
MIX
+
Sub
ALC1
Lch
Rch
HPF3
LPF1
LPF2
HPF2
HPF1
Sub
+
ALC1
Rch
Main
MIX
wind-noise cut
Filtering
Equalizing
Figure 21. Digital EQ/HPF/LPF
MS0140-E-01
- 26 -
2002/07
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