AKD4671-B Datasheet, PDF (37/51 Pages) Asahi Kasei Microsystems – stereo CODEC with built-in Microphone-Amplifier

[AKD4671-B]
8-3.Indication of a frequency characteristic
A frequency characteristic is displayed when [Frequency Response] button is clicked. The register values are
updated at the same time.
If "Frequency Range" is changed, and [UpDate] button is clicked, indication of a frequency characteristic is
updated.
Figure16. A frequency characteristic indication result
In the following cases, a register set values are 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 compensation for center frequency of a notch filter
When a gain of 5 band Equalizer is set to "-1", Equalizer becomes a notch filter. When center frequency of several
notch filters are near frequency each other, center frequency error occurs (Figure 17).
When "Notch Filter Auto Correction" button is checked, automatic compensation is executed for center frequency
of a notch filter.
Register setting and frequency characteristics are displayed after automatic compensation (Figure18).
This automatic compensation is available for EqualizerBand where a gain is set to "-1".
(Note) When distance among center frequencies is smaller than band width, there is a possibility that automatic
compensation does not operate normally. Please confirm a compensation result by indication of a frequency
characteristic.
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2007 / 05