AKD4671-B Datasheet, PDF (35/51 Pages) Asahi Kasei Microsystems – stereo CODEC with built-in Microphone-Amplifier

[AKD4671-B]
8-1. Setting of a parameter
(1) Please set a parameter of each Filter.
Item
Contents
Setting range
Sampling Rate
Sampling frequency (fs)
7350Hz ≤ fs ≤ 48000Hz
FIL3
Cut Off Frequency
Stereo separation emphasis filter cut off fs/10000 ≤ Cut Off Frequency ≤
frequency
(0.497 * fs)
Filter type
Type of stereo separation emphasis filter
LPF or HPF
Gain
Gain of stereo separation emphasis filter
–10dB ≤ Gain ≤ 0dB
HPF
Cut Off Frequency
High pass filter cut off frequency
fs/10000 ≤ Cut Off Frequency
≤ (0.497 * fs)
LPF
Cut Off Frequency
Low pass filter cut off frequency
fs/20 ≤ Cut Off Frequency ≤
(0.497 * fs)
EQ for Gain Compensation (EQ0)
Pole Frequency
Pole Frequency
fs/10000 ≤ Pole Frequency ≤
(0.497 * fs)
Zero-point Frequency
Zero-point Frequency
fs/10000 ≤ Zero-point Frequency
≤ (0.497 * fs)
Gain
Gain
0dB ≤ Gain ≤ +12dB
5 Band Equalizer
EQ1-5 Center Frequency
EQ1-5 Center Frequency
0Hz ≤ Center Frequency < (0.497
* fs)
EQ1-5 Band Width
EQ1-5 Band Width
( Note 1) 1Hz ≤ Band Width < (0.497 * fs)
EQ1-5 Gain
EQ1-5 Gain
( Note 2)
-1≤ Gain < 3
Note 1. Bandwidth where the gain gap is 3dB compared with center frequency.
Note 2. When a gain is smaller than "0", EQ becomes a notch filter.
(2) Please set ON/OFF of Filter with check buttons of “FIL3”, “EQ0”, “LPF”, “HPF”, “HPFAD”, “EQ1”, “EQ2”,
“EQ3”, “EQ4”, “EQ5”. When the button is checked, Filter becomes ON. When “Notch Filter Auto Correction”
is checked, automatic compensation is executed for center frequency of notch filter.
(“Cf. 8-4. automatic compensation for center frequency of a notch filter”)
Figure14. Filter ON/OFF setting button
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2007 / 05