AKD4634-A Datasheet, PDF (24/46 Pages) Asahi Kasei Microsystems – 16bit mono CODEC with MIC/SPK/VIDEO amplifier.

[AKD4634-A]
8. [Filter Dialog]
A calculation of a coefficient of Digital Programmable Filter such as HPF,EQ filter ,a write to a register and check
frequency response such as HPF,EQ filter.
Window to show to Figure 12 opens when push a [Filter] button .
Figure12. [Filter] Window
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
HPF
Cut Off Frequency
High pass filter cut off frequency
fc/fs ≥ 0.0001 (fc min = 1.6Hz at 16kHz)
LPF
Cut Off Frequency
Low pass filter cut off frequency
fc/fs ≥ 0.05 (fc min = 2205Hz at 44.1kHz)
5 Band Equalizer
EQ1-5 Center Frequency EQ1-5 Center Frequency
EQ1-5 Band Width
EQ1-5 Band Width
(Note 1)
fo_n / fs < 0.497
EQ1-5 Gain
EQ1-5 Gain
(Note 2)
-1≤ K_n < 3
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.
<KM088301>
- 24 -
2007/07