[AK4675]
(1) ADC: Include the Digital Filter (LPF) for ADC as shown in “FILTER CHRACTERISTICS”.
(2) DAC: Include the Digital Filter (LPF) for DAC as shown in “FILTER CHRACTERISTICS”.
(3) HPF: High Pass Filter. Applicable to use as Wind-Noise Reduction Filter. (See “Digital Programmable Filter”.)
(4) LPF: Low Pass Filter (See “Digital Programmable Filter”.)
(5) Stereo Separation: Stereo Separation Emphasis Filter & Gain Comparison. (See “Digital Programmable Filter”.)
Gain Comparison is composed with EQ0 and Gain blocks. This block adjusts the frequency response after Stereo
Separation Emphasis.
(6) 5-Band Notch: Applicable to use as Equalizer or Notch Filter. (See “Digital Programmable Filter”.)
(7) ALC: Input Digital Volume with ALC function. (See “Input Digital Volume” and “ALC Operation”.)
(8) SVOLA: Side Tone Volume at Internal MIC/SPK or External Headset Phone Call. (See “Side Tone Volume
(SVOLA)”.)
(9) 5-Band EQ: Equalizer for playback path. (See “5-band Equalizer”.)
(10)DATT: Digital Volume for playback path. (See “Digital Output Volume”.)
(11)SMUTE: Soft mute. (See “Soft Mute”.)
(12)DATT-B: Digital Volume for Recording of Received Voice. (See “Digital Volume for Recording of Received
Voice”)
(13)DATT-C: Digital Volume of Received Voice. (See “Digital Volume of Received Voice”)
(14)SVOLA: Side Tone Volume at B/T Headset Phone Call. (See “Side Tone Volume for B/T Phone Call”.)
Mode
PMADL
PMADR
PMDAL
PMDAR
PFSEL
Figure
Recording Mode
1
1
0
1
1
0
0
1
0
1
1
0
1
0
0
0
0
1
1
1
1
0
0
0
1
1
1
1
0
0
0
0
0
0
1
Figure 57
Recording &
Playback Mode
Figure 58
Figure 59
Playback Mode
Table 22. Recode/Playback Mode
2nd Order
HPF
1st Order
LPF
Stereo
Separation
Gain
Compensation
5 Band
Notch
ALC
(Volume)
ADC
Figure 57. Path at Recording Mode
2nd Order
HPF
1st Order
LPF
Stereo
Separation
Gain
Compensation
5 Band
Notch
ALC
(Volume)
ADC
DAC
5 Band
EQ
DEM
SMUTE
DATT
Figure 58. Path at Recording & Playback Mode
1st Order
HPF
“0” Data
ADC
DAC
5 Band
EQ
5 Band
EQ
Gain
Compensation
Stereo
Separation
1st Order
LPF
1st Order
HPF
ALC
(Volume)
DEM
SMUTE
DATT
Figure 59. Path at Playback Mode
MS0963-E-00
2008/05
- 71 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
