3.3.3 Sampling Frequency
Basic Operating Set-Up—Mac OS
www.ti.com
To set the microphone sidetone:The volume setting of the microphone sidetone is controlled by the individual application software onthe Mac. For example, Audio Recording using QuickTime
®
(as shown in Figure 3-15 ) sets themicrophone 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 EVMis plugged in/out.
Under the Mac OS X operating system, it is necessary to select a specific sampling frequency becausethe 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 inFigure 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 inFigure 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 2009Submit Documentation Feedback