[AK4634]
Addr Register Name
11H Digital Filter Select 1
D7
0
R
0
D6
0
R
0
D5
LPF
R/W
0
D4
HPF
R/W
1
D3
0
R
0
D2
0
R
0
D1
0
R
0
D0
1
R
1
R/W
Default
HPF: HPF Enable in Filter block.
0: Disable
1: Enable (default)
When HPF bit is “0”, HPF block is bypassed (0dB).
When HPF bit is “1”, F1A13-0, F1B13-0 bits are enabled.
LPF: LPF Coefficient Setting Enable
0: Disable (default)
1: Enable
When LPF bit is “0”, LPF block is bypassed (0dB).
When LPF bit is “1”, F2A13-0, F2B13-0 bits are enabled.
Addr Register Name
1CH HPF Co-efficient 0
1DH HPF Co-efficient 1
1EH HPF Co-efficient 2
1FH HPF Co-efficient 3
R/W
D7
F1A7
0
F1B7
0
D6
F1A6
0
F1B6
0
D5
F1A5
F1A13
F1B5
F1B13
W
D4
F1A4
F1A12
F1B4
F1B12
W
D3
F1A3
F1A11
F1B3
F1B11
W
D2
F1A2
F1A10
F1B2
F1B10
W
D1
D0
F1A1
F1A9
F1B1
F1B9
W
F1A0
F1A8
F1B0
F1B8
W
W
W
Default
F1A13-0 bits = 0x1F16, F1B13-0 bits = 0x1E2B
F1A13-0, F1B13-0: FIL1 (Wind-noise Reduction Filter) Coefficient (14bit x 2)
Default: F1A13-0 bits = 0x1F16, F1B13-0 bits = 0x1E2B
fc = 75Hz@fs = 8kHz, 150Hz@fs = 16kHz
Addr Register Name
D7
BPCNT
R/W
0
D6
0
R
0
D5
0
R
0
D4
0
R
0
D3
0
R
0
D2
0
R
0
D1
BPFR1
R/W
0
D0
BPFR0
R/W
0
20H
BEEP Frequency
R/W
Default
BPFR1-0: BEEP Signal Output Frequency Setting (Table 38 ~ Table 40)
Default: “00”
BPCNT: BEEP Signal Output Mode Setting
0: Once Output Mode (default)
1: Continuous Mode
In continuous mode, the BEEP signal is output while BPCNT bit is “1”.
In once output mode, the BEEP signal is output by only the frequency set with BPTM6-0 bits.
MS0983-E-00
2008/07
- 69 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
