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4.11 Filters Tab

TLV320AIC3104EVM Software

Figure 15. Filters Tab

The TLV320AIC3104 has an advanced feature set for applying digital filtering to audio signals. This tab

controls all of the filter features of the TLV320AIC3104. 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 4.8. See Figure 15.

The AIC3104 digital filtering is available to both the ADC and DAC. The ADC has optional high pass

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 15 is divided into several areas. The left side of the tab, is used to select between the DAC or

ADC filters and assist in the selection and calculating the desired filter coefficients. The right hand 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.

SLAU218 – August 2007

TLV320AIC3104EVM and TLV320AIC3104EVM-PDK

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