Texas Instruments TLV320AIC3107EVM-K quick start Filters Tab

TLV320AIC3107EVM Software www.ti.com

4.9Filters Tab

Figure 14. Filters Tab

The TLV320AIC3107 has an advanced feature set for applying digital filtering to audio signals. This tab controls all of the filter features of the TLV320AIC3107. In order to use this tab and have plotting of filter responses correct, the DAC sample rate must be set correctly. Therefore, the clocks must be set up correctly in the software following the discussion in Section 4.6. See Figure 14.

The AIC3107 digital filtering is available to both the ADC and DAC. The ADC has optional high-pass (HP) filtering and allows the digital output from the ADC through digital effects filtering before exiting the codec through the PCM interface. Likewise, the digital audio data can be routed through the digital effects filtering before passing through the optional de-emphasis filter before the DAC. The digital effects filtering can only be connected to either the ADC or DAC, not both at the same time.

The Figure 14 is divided into several areas. The left side of the tab, is used to select between the DAC or ADC filters and to assist in the selection and calculating of the desired filter coefficients. The right side of the tab shows a frequency response plot of the digital effects filter selected and the coefficients that are programmed into the device. The plots show the magnitude and phase response of each biquad section, plus the combined responses of the two biquad filters. Note that the plot shows only the responses of the effect filters, not the combined response of those filter along with the de-emphasis and ADC high-pass filters.

20 TLV320AIC3107EVM-K SLAU261–November 2008

Submit Documentation Feedback