To analyze Matlab's ability to modify audio waveforms, we will examine a simple sine wave.

Begin by copying and pasting the following into Matlab script editor:

Fs1= 1/8000; t= [0 : Fs1 :2]';

This is simply a sampling frequency for your sine wave that you will need to collect results.

Next, input the sine wave by saying:

y=sin (2 * pi * 500* t)

Next, listen to the sound produced by this sine wave by typing:

sound (y);

Then run the code. (You may need headphones if you're using a computer lab)

To complete this quest, answer the following questions in the submission box below.

• What is the frequency of this sine wave, sin (2 * pi * 500* t)? How do you know?
• What happens when you multiply the amplitude of the sine wave by
  • A constant value > 10
  • A constant value < .2
  • A decaying exponential, i.e. e^(-5t)
  • An increasing exponential, i.e. e^(5t)

(For more information see the "Engineering Tools - MATLAB" chapter from Pathfinder)

Submission Details

In order to complete this quest, you need to click the "Start Quest" button, and then upload a word document that anwers the following questions:

• What is the frequency of this sine wave, sin (2 * pi * 500* t)? How do you know?
• What happens when you multiply the amplitude of the sine wave by
  • A constant value > 10
  • A constant value < .2
  • A decaying exponential, i.e. e^(-5t)
  • An increasing exponential, i.e. e^(5t)