AKD4646-B Datasheet, PDF (17/30 Pages) Asahi Kasei Microsystems – Stereo CODEC with built-in MIC/SPK amplifier

ASAHI KASEI
[AKD4646-B]
8-1. Setting of a parameter
(1) Please set a parameter of each Filter.
Item
Sampling Rate
FIL3
Cut Off Frequency
Filter type
Gain
HPF
Cut Off Frequency
Contents
Sampling frequency (fs)
Stereo separation emphasis filter cut cff
frequency
Type of stereo separation emphasis filter
Gain of stereo separation emphasis filter
High pass filter cut off frequency
LPF
Cut Off Frequency
Low pass filter cut off frequency
EQ for Gain Compensation (EQ0)
Pole Frequency
Pole Frequency
Zero-point Frequency
Zero-point Frequency
Gain
5 Band Equalizer
EQ1-5 Center Frequency
Gain
EQ1-5 Center Frequency
EQ1-5 Band Width
EQ1-5 Band Width
(Note 1)
EQ1-5 Gain
EQ1-5 Gain
(Note 2)
Note 1. A gain difference is a bandwidth of 3dB from center frequency.
Note 2. When a gain is smaller than 0 , EQ becomes a notch filter.
Setting range
7350Hz ” fs ” 48000Hz
fs/10000 ” Cut Off Frequency ”
(0.497 * fs)
LPF or HPF
–10dB ” Gain ” 0dB
fs/10000 ” Cut Off Frequency
” (0.497 * fs)
fs/20 ” Cut Off Frequency ”
(0.497 * fs)
fs/10000 ” Pole Frequency ”
(0.497 * fs)
fs/10000 ” Zero-point Frequency
” (0.497 * fs)
0dB ” Gain ” +12dB
0Hz ” Center Frequency < (0.497
* fs)
1Hz ” Band Width < (0.497 * fs)
-1” Gain < 3
(2) “FIL3”, “EQ0”, “LPF”, “HPF”, “HPFAD”, “EQ1”, “EQ2”, “EQ3”, “EQ4”, “EQ5” Please set ON/OFF of Filter with
a check button. When checked it, Filter becomes ON. When checked “Notch Filter Auto Correction”, perform
automatic revision of center frequency of a notch filter. (“Cf. 8-4. automatic revision of center frequency of a notch
filter”)
Figure14. Filter ON/OFF setting button
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2006 / 08