Datasheet

Program Description
3-20
3.5.4.4 Sidetone Section
The TSC2100 has an analog sidetone and a digital sidetone circuit. The audio
output of the TSC2100 includes a mix of the DAC and the sidetone channels,
in proportion to their respective volume settings.
The analog sidetone is enabled when the PowerUp AnaSideTone box is
checked, and available only if the single-ended MICIN or AUX Input Select is
selected as input to the ADC. Its volume can be adjusted by the analog volume
control slider, ranging from 12 dB to −34.5 dB in 0.5-dB steps. The analog
sidetone is muted when the Mute box under the slider is checked. Additionally,
similar to the audio ADC and DAC, the analog sidetone volume change can
be in soft stepping mode if the corresponding box is checked.
The TSC2100’s digital sidetone has three settings. The volume is controlled
by the digital slider, which changes from 0 dB to −48 dB in steps of 1.5 dB. The
digital sidetone can be muted by checking the mute box under the volume
control slider. The gain change is implemented with zero crossover, when
enabled by checking the box below the sliders, and a possible pop sound may
be avoided or reduced.
3.5.4.5 Keyclick Section
When the Enable Key Click box is checked, a clicking sound is heard
whenever an audio related setting is selected or checked in the audio screen
or in the PLL section of the configuration screen, or the bass boost filter and
de-emphasizing filter are selected in the Base Boost Filter screen (see
Figure 3−10).
The volume, frequency, and duration (length) of this keyclick can be adjusted
using the corresponding slider and selectors shown in Figure 3−9.
3.5.5 Bass Boost Filter Screen
The Bass Boost Filter screen displays all of the coefficients for the bass boost
filter function of the TSC2100, plus the Deemphasis Filter On enable box.
These coefficients are programmable. This screen is shown in Figure 3−10.