www.ti.com | TLV320AIC3107EVM Software |
4.9.3Digital Effects Filters
The digital effect filters (the biquad filters) of the TLV320AIC3107 are selected using the check boxes shown in Figure 19. The
Figure 19. Enabling Filters
When designing filters for use with TLV320AIC3107, the software allows for several different filter types to be used. These options are shown on a tab control in the lower left corner of the screen. When a filter type is selected, and suitable input parameters defined, the response are shown in the Effect Filter Response graph. Regardless of the setting for enabling the Effect Filter, the filter coefficients are not loaded into the TLV320AIC3107 until the Download Coefficients button is pressed. To avoid noise during the update of coefficients, it is recommended that the user uncheck the Effect Filter enable check boxes before downloading coefficients. Once the desired coefficients are in the TLV320AIC3107, enable the Effect Filters by checking the boxes again.
4.9.3.1Shelf Filters
A shelf filter is a simple filter that applies a gain (positive or negative) to frequencies above or below a certain corner frequency. As shown in Figure 20, in Bass mode a shelf filter applies a gain to frequencies below the corner frequency; in Treble mode the gain is applied to frequencies above the corner frequency.
Figure 20. Shelf Filters
To use these filters, enter the gain desired and the corner frequency. Choose the mode to use (Bass or Treble); the response is plotted on the Effect Filter Response graph.
23 |
Submit Documentation Feedback