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ECE 220
Multimedia Signal Processing
October 3, 2006
Fall 2006
Homework 7
Assigned:
October 3, 2006
Due:
Monday, October 16
, by 4:30 pm in the 220 lockbox on the 2nd floor of
Phillips
Office hours:
See the web page for everyone’s office hours:
http://people.ece.cornell.edu/~hemami/ece220
Goals & concepts:
Understanding spatial frequency and using the CSF. Understanding the
DFT from both a summation perspective and a matrix multiplication
perspective; practice with taking DFTs; understanding and use of the DFT
as samples of the DTFT.
Relevant text sections: Oppenheim & Schafer handout on the DFT (from Chapter 8 of “Discrete
Time Signal Processing,” Oppenheim, Schafer, and Buck)
1.
Zebra or horse?
You are on safari in Africa and the animal below happens to be out and
about on the savannah the same day you are zipping around in your Toyota Land Cruiser.
First consider that you are
only
looking at “area 1” on his torso. Even though his stripes are
a square wave, let’s approximate them as a single sinusoid with 4 cycles.
(a) Suppose you are at a distance of 100 feet. How many cycles/degree are in Area 1?
(b) Can you perceive the stripes in area 1 at a distance of 100 feet (if yes, you will think he
is a zebra. if no, you will think he is a gray horse)? If not, at what distance will area 1
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This note was uploaded on 02/10/2008 for the course ECE 2200 taught by Professor Johnson during the Fall '05 term at Cornell University (Engineering School).
 Fall '05
 JOHNSON
 Signal Processing

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