User guide for check_audioLevels
This page gives a brief explanation on how to use the check_audioLevels function in MATLAB
This command should be used before the participant arrives AND with the participant before you run the experiment.
Before the participant arrives:
-
Run
check_audioLevels
in MATLAB - Select choice a) that the mic and headphones are working, then check background noise levels (before participant arrives)
- Put on mic and headphones and speak
- Make sure you can hear your voice through the headphones
- Press space to continue
- The next screen will tell you to make sure the headphones are plugged in to the correct output of the headphone amplifier *
- Use the audiometer/SPL meter to check the noise level
- The settings of the SPL meter should be set to: **
- No max or min
- A mode
- Slow
- Level 50-100 db
- Take the foam cover off of the SPL meter and place it inside the headphones
- The noise level should be about 60 db
- If it is not, adjust the appropriate headphone output knob on the headphone amplifier
Once you are ready to run the experiment:
- Run
check_audioLevels
in MATLAB - Select b) the microphone level with the participant
- First, it will tell you to make sure the headphones are plugged in to the correct output of the headphone amplifier *
- Use the audiometer/SPL meter to check the noise level
- The settings of the SPL meter should be set to: **
- No max or min
- A mode
- Slow
- Level 50-100 db
- The settings of the SPL meter should be set to: **
- Take the foam cover off of the SPL meter and place it inside the headphones
- Have the participant sustain the word "head" at a comfortable volume
- The noise level should be about 80 db
- If it is not, adjust the microphone gain (black knob) ***
* (headphone amplifier outputs)

** (correct settings for the SPL meter)

*** (microphone gain)
