AKD4691-A Datasheet, PDF (29/68 Pages) Asahi Kasei Microsystems – Evaluation board Rev.0 for AK4691

[AKD4691-A]
8. [Filter Dialog]
This dialog can calculate of a coefficient of Digital Programmable Filter (FIL1, FIL3 and EQ), write to a register and
check frequency response.
Window as shown in Figure 16 opens when push a [Filter] button.
Figure 16. [Filter] window
8-1. Setting of a parameter
(1) Please set a parameter of each Filter.
[Sampling Rate]
Æ Input value of sampling frequency [unit: Hz] <Default: 48000>
[FIL1A Cut Off Frequency] Æ Input value of cut off frequency of FIL1A [unit: Hz] <Default: 200>
[FIL3A Cut Off Frequency] Æ Input value of cut off frequency of FIL3A [unit: Hz] <Default: 4000>
[FIL3A GAIN]
Æ Input value of gain of FIL3A (0~-10dB) [unit: dB] <Default: -6>
[EQA Pole Frequency]
Æ Input value of pole frequency of EQA [unit: Hz] <Default: 2000>
[EQA Zero-point Frequency] Æ Input value of zero frequency of EQA [unit: Hz] <Default: 4000>
[EQA GAIN]
Æ Input value of gain of EQA (+12~0dB) [unit: dB] <Default: 6>
[FIL1B Cut Off Frequency] Æ Input value of cut off frequency of FIL1B [unit: Hz] <Default: 200>
[FIL3B Cut Off Frequency] Æ Input value of cut off frequency of FIL3B [unit: Hz] <Default: 4000>
[FIL3B GAIN]
Æ Input value of gain of FIL3B (0~-10dB) [unit: dB] <Default: -6>
[EQB Pole Frequency]
Æ Input value of pole frequency of EQB [unit: Hz] <Default: 2000>
[EQB Zero-point Frequency] Æ Input value of zero frequency of EQB [unit: Hz] <Default: 4000>
[EQB GAIN]
Æ Input value of gain of EQB (+12~0dB) [unit: dB] <Default: 6>
(2) Please set a filter type of FIL1 and FIL3.
Select “LPF” or “HPF” from [Filter type] of FIL1A, FIL3A, FIL1B and FIL3B.
(3) Please set ON/OFF of “FIL1A”, “FIL3A”, “EQA”, “FIL1B”, “FIL3B”, “EQB” with a check button. When checked it,
the filter becomes ON.
<KM089100>
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2007/06