Texas Instruments TLV320AIC23 Message Area, Line Input Volume, HeadPhone Volume, Reset Button

Main Panel

4.4.4Message Area

Directly below the Master and Slave radio buttons on the left side of the main panel is a message area. Short text instructions to the operator, status indications, or error messages can appear in this box. A listing of possible error messages appears in Chapter 5, along with an explanation of the errors.

4.4.5Line Input Volume

The line input volume section of the main panel consists of two identical boxes, one each for the left and right input channels. Each box contains the following:

-A level bar that indicates the volume level. To set the volume, click at the desired location; the length of the bar adjusts to that point, changing the volume level accordingly.

-A Mute check box to silence the channel

-A Gang check box to tie the volume controls of both channels together. The channel that has its Gang box checked automatically locks the opposite channel into a volume setting the same as its own.

-A display area with a numeric readout of the actual gain level setting in dB

Left and right line input volume settings can also be changed in the L Vol (Line Input) and R Vol (Line Input) registers on the register panel (see Section 4.6.2 and Section 4.6.3, respectively).

4.4.6HeadPhone Volume

The headphone volume section of the main panel consists of two identical boxes, one each for the left and right audio channels. Each box contains the following:

-A level bar that indicates the volume level. To set the volume, click at the desired location; the length of the bar adjusts to that point, changing the volume level accordingly.

-A Zero Cross check box. When the zero-cross detect circuit for the headphone is enabled, the volume control values are only updated when the input signal to the gain stage is close to the analog ground level.

-A Gang check box to tie the volume controls of both channels together. The channel that has its Gang box checked automatically locks the oppo- site channel into a volume setting the same as its own.

-A display area with a numeric readout of the actual gain level setting in dB

Left and right headphone volume settings can also be changed in the L Vol (HeadPhone) and R Vol (HeadPhone) registers on the register panel (see Section 4.6.4 and Section 4.6.5, respectively).

4.4.7RESET Button

The RESET button sends an I2C reset command to the AIC23/DAC23.

4.4.8EXIT Button

EXIT closes all files. The EXIT button can be clicked at any time.

Software4-5