3.3.3 Sampling Frequency
Basic Operating Set-Up—Mac OS
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To set the microphone sidetone:
The volume setting of the microphone sidetone is controlled by the individual application software on
the Mac. For example,
Audio Recording
using QuickTime
®
(as shown in
Figure 3-15
) sets the
microphone volume for sidetone from –76dB to 0dB.
Figure 3-15. QuickTime Audio Recording Controls
After this process is complete, the system volume setting for each component is maintained even if EVM
is plugged in/out.
Under the Mac OS X operating system, it is necessary to select a specific sampling frequency because
the sampling frequency cannot be changed on nearly all application software.
To set the DAC sampling frequency:
1. Open the
Audio MIDI Settings
options (
Application
→
Utility
→
Set Audio MIDI
), as illustrated in
Figure 3-16
.
2. Select the
Audio Input
tab in the
Set Audio MIDI
options group, as
Figure 3-16
shows.
3. Select the desired DAC sampling frequency from seven options: 8 kHz, 11.025 kHz,16 kHz, 22.5 kHz,
32 kHz, 44.1 kHz, and 48 kHz.
To set the ADC sampling frequency:
1. Open the
Audio MIDI Settings
options (
Application
→
Utility
→
Set Audio MIDI
), as illustrated in
Figure 3-16
.
2. Select the
Audio Output
tab in the
Set Audio MIDI
options group, as shown in
Figure 3-16
.
3. Select the desired ADC sampling frequency from seven options: 8 kHz, 11.025 kHz,16 kHz, 22.5 kHz,
32 kHz, 44.1 kHz, and 48 kHz.
30
Set-Up Guide
SBAU141 – January 2009
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