AKD4646-B Datasheet, PDF (19/30 Pages) Asahi Kasei Microsystems – Stereo CODEC with built-in MIC/SPK amplifier

ASAHI KASEI
[AKD4646-B]
8-3.Indication of a frequency characteristic
A frequency characteristic is displayed when push a [Frequency Response] button. In addition, a register set point is
updated then, too.
Change "Frequency Range", and indication of a frequency characteristic is updated when push a [UpDate] button.
Figure16. A frequency characteristic indication result
When it is as follows that a register set point is updated.
(1) When [Register Setting] button was pushed.
(2) When [Frequency Response] button was pushed.
(3) When [UpDate] button was pushed on a frequency characteristic indication window.
(4) When set ON/OFF of a check button “Notch Filter Auto Correction”
8-4. Automatic revision of center frequency of a notch filter
When set a gain of 5 band Equalizer to -1, Equalizer becomes a notch filter. When center frequency of plural notch filters
is adjacent, produce a gap to central frequency (Figure 17). When check "a Notch Filter Auto Correction" button, perform
automatic revision of central frequency of a notch filter, display register setting after automatic revision and a frequency
characteristic (Figure 18). This automatic revision is availability for Equalizer Band which set a gain to "-1".
(Note) When distance among center frequency is smaller than band width, there is a possibility that automatic revision is
not performed definitely. Please confirm a revision result by indication of a frequency characteristic.
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2006 / 08