How to Create a Frequency Pattern Test Using Adobe Audition and Praat?
In this article, I will explain how to create the Frequency Pattern Test. As I mentioned in the previous article, 880 Hz (Low) and 1122 Hz (High) pure sounds are used in the Frequency Pattern Test.
Note: According to Musiek (1994), the stimulus duration is 150-msec, the interstimulus interval is 200-msec; the time between patterns will be taken for 6-sec. As at first, we will learn the formation of the Low-Low-High pattern and then you will be able to create all the patterns on your own.
- Creating Pure Sounds: I use Praat Software to create pure sounds of 880 Hz and 1122 Hz.
- After opening the Praat software, click the “New Sound-Create Sound as pure tone …” tab.
- Name: 880Hz (make sure the characters are unified)
Start time (s): 0.0
End time (s): 0.15 (150-msec)
Tone Frequency (Hz): 880
- Note that the Fade-in duration (s) and the Fade-out duration (s) values should be 0.01 because Musiek determined the rise and fall times as 10 msec in the Frequency Pattern Test.
- We should do the same for 1122 Hz and then click the OK tab. We will see a screen like the following.
- Let’s save our sound files!
- One-click on the sounds and then perform the following step.
At this stage, I’ve switched to Adobe Audition to create the frequency patterns.
- Open the Adobe Audition software and click the ‘File-New-Multitrack Session …’ tab.
- Session Name: Frequency Pattern Test
- You will see a screen like the one shown below.
- At this stage, take the sounds we produce and upload them to the software as on the screen.
The interface and usage of Adobe Audition software is very simple. I’ll share a screenshot of each step from now on, try to do it as accurately as possible and contact me if you encounter a problem.
- As shown in the figure below, our pure sound of 880 Hz started at 0.00 and ended at 0.15 sec (150msec). Total duration is 150 msec.
- Then, according to our test, we leave a 200 msec gap and put our 880 Hz pure sound again at 350 msec.
- As shown in the figure below, our pure sound of 880 Hz started at 0.35 and ended at 0.50. Total duration is 150 msec.
- We’re placing the 1122 Hz pure sound that we call high.
- As shown in the figure below, our pure sound of 1122 Hz started at 0.70 sec and ended at 0.85 sec. Total duration is 150 msec.
- At the end of all procedures, we created our first frequency pattern.
- We placed the LLH frequency pattern between 0.00 – 0.85.
- As is known, six different patterns are created and randomly arranged in the Frequency Patterns Test.
- Now is the time to combine the pure sounds we settled.
- First of all, let’s make the pure sounds that we created by minimizing the screen completely selected.
- Then right mouse click on any sound and click ‘Bounce to New Track – Selected Clips Only’ tab
- A new sound was created by combining the pure sounds that we produced before.
- When you double click on the sound that says Bounce_1, the screen below will greet us.
- Now let’s record the sound we created.
- To do so, click on the ‘File-Export-File …’ tab.
- Let’s finish the recording.
- We have produced the LLH pattern using Praat and Adobe Audition.
- Below is a short Frequency Pattern Test that I created with the same method.
- The time between patterns is about 6 seconds.
- HHL – HLL – LHL – LHH – LHH
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