CS 3413 Data Communications, Fall 2004 Assignment 1 Comments

This assignment had 11 questions, each worth 10 points.

The maximum score on this assignment is 110 points.

If you did not do Problem 0, your score has a plus sign after it.
Send me an email by Tuesday, September 25 stating that your copy of the syllabus has the correct date for the final exam
and I will add 10 points to your score on this assignment.

1. For problem 1, I only checked that you did the problem, not that your formulas were correct.
   It is your responsibility to make sure you have access to correct trig identities.
2. For problem 2, and any other time you need to express a time or distance, make sure you include the units.
   In this case your answer should be in seconds or milliseconds.
3. The simplest form uses the fact the actual values of the trig functions at the standard angles.
4. I did not grade problem 4, only looked to see that you did it.
   I had expected the results of this problem to be different. The values given for the frequencies of the notes are not quite equal to those of the equal tempered scale, rather than the harmonic scale as shown.
5. In problem 5 it is important to note that the 0 on the t axis is in the middle, not at the left end as in other graphs in this chapter.
6. In problem 6 you needed to use only sine functions, not cosine functions.
   The frequency should not be negative.
7. In problem 7, the easiest way to do this is just to look at the graph.
8. In problem 8, many people incorrectly assumed that the T₁ and T₂ were integers.
9. In problem 9, the simplest way to see what it looks like is to subtract the upper and lower graphs of Figure 3.7.
10. In problem 10 you were to give an answer related to figure 3.5b, not a general answer about digital communication.