Reference no: EM132337434

The goal of this assignment is to become familiar with complex tones and to empirically see both time and frequency representations of complex tones in Praat. After completing this assignment, you should be able to calculate fundamental period and frequency based on time representation and frequency representation. Make sure you watch the following videos before doing the assignment, as the videos demonstrate how to use Praat. These videos are available in Modules under Praat Videos.

1. How to install Praat

2. Introduction to Praat

3. How to create complex tones

4. How to calculate spectrum

5. How to plot and report results

1- Create a sine wave with amplitude of 0.5 and frequency of 200 Hz. Choose 1 second as the total duration of the sound.

1.1. Plot the first 50 ms of the time-domain representation of the sound (attach it to your report)

1.2. What is the period of the signal?

1.3. Calculate spectrum of the signal

1.4. How many harmonics do you see? Why?

1.5. What is the frequency of the sine wave based on the calculated spectrum?

1.6. Plot the first 1000 Hz of the frequency-domain representation or spectrum of the sound (attach it to your report)
 
2- Create a complex periodic tone that consists of 3 sine waves with the following amplitudes and frequencies: A1=0.5, F1=200 Hz, A2=0.25, F2=400 Hz, A3=0.1, F3=600 Hz. Choose 1 second as the total duration of the sound.

2.1. Plot the first 50 ms of the time-domain representation of the sound (attach it to your report)

2.2. What is the fundamental period of the signal?

2.3. Calculate spectrum of the signal

2.4. How many harmonics do you see? Why?

2.5. What is the frequency of the first harmonic?

2.6. What is the fundamental frequency of the wave? What is its relationship with the fundamental period of the signal?

2.7. Plot the first 1000 Hz of the frequency-domain representation or spectrum of the sound (attach it to your report)