Datasheet

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AIC3254 Control Software

4.1.2.2 Automatic Gain Control

The left-channel Automatic Gain Control (AGC) can be enabled by checking the Enable Left AGC box

(Figure 10). Pressing the Capture Audio button records the left-channel audio. Its corresponding data is

displayed in the audio capture graph window. The small white window located at the bottom right of the

AGC tab displays the audio waveform of the recorded data. Ensure that the AIC32x4 EVM is selected as

the computer's default audio capture device before pressing this button. To set the TLV320AIC3254EVM-

K as the default audio device, open the Windows™ Control Panel → Sounds and Audio Devices

Properties and set the AIC32x4 EVM as the default audio recording device. Also, do not use any other

media player or audio recording software while the control software is recording.

The target level and noise threshold parameters can be modified by dragging the horizontal cursor lines

located at the audio capture graph window. Its numeric values are displayed to the right of the graph.

Noise threshold can be disabled by unchecking the Enable Noise Threshold box. The AGC Max Gain

control sets the maximum allowed AGC PGA Gain. The AGC Gain indicator bar continuously displays the

contents of Page 0/Register 93 if the Enable Polling box is checked.

Other parameters can be accessed by checking the Advanced? box. For more information about AGC,

see the Information tab and the data sheet.

Other flags related to this feature can be accessed at the Status Flags panel.

Figure 10. Automatic Gain Control Panel

SLAU264A–October 2008–Revised September 2012 TLV320AIC3254EVM-K

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