3 47 Example 3 Case B Step 1 Write partial fraction terms 1 Step 2 For each

3 47 example 3 case b step 1 write partial fraction

This preview shows page 46 - 50 out of 58 pages.

(3)
Image of page 46

Subscribe to view the full document.

47 Example 3 Case B Step 1 Write partial fraction terms. (1) Step 2 For each pole, evaluate the unknown coefficients. (2)
Image of page 47
48 Step 3 Find the Inverse Laplace Transform using table of transforms and properties. (3)
Image of page 48

Subscribe to view the full document.

49 So far we have been learning about the Laplace Transform and the frequency domain significantly, but we have not talked much about actual circuits yet. One of the first major circuit types that we will look at are filters; we briefly talked about them during the first lecture. The filter has been the basis for radio for a long time as a most basic principle, to receive a radio signal, one needs a way to distinguish it clearly from background noise and other signals. While this is a fairly mundane application, the basic concepts we learn in this class can be applied to more complex tasks. For example, you may have heard in passing of SETI the search for extraterrestrial intelligence, which has been conducted for years using advanced radio telescopes and, more recently, distributed home computing. The following is a brief story about one of the most promising yet mysterious results of the program, the “Wow!” signal. Written By: Alan Bellows, Original article available at: It's no rare occurrence in science fiction: The introverted researcher working the graveyard shift at a SETI radio observatory jumps out of his seat in surprise when the red light blinks on the control panel. "We're getting a signal!" he shouts into a phone as needles dance across paper chart recorders, and scientists rapidly converge on the scene. At some point someone yells, "Get me the President!" at the person whose job it is to get presidents. On August 15th, 1977, such a signal was received at the Big Ear radio observatory in Ohio, though the ensuing drama was considerably more subdued. The volunteer who spotted the pattern on the paper logs circled the data and wrote "Wow!" in the margin. The radio telescope was observing space as part of the Search for Extra-Terrestrial Intelligence (SETI) program, and it was the most compelling signal the receiver had recorded in its fourteen years of operation. It was powerful enough to push the Big Ear's monitoring device off the charts. The signal came from the direction of the constellation Sagittarius, and lasted seventy-two seconds at about 1420.456 MHz before it faded away. The volunteer who found and circled the data in the paper printout was Jerry Ehman, who was amazed at the signal's intensity and what a narrow range of frequencies it appeared in. Seventy-two seconds also happened to be the exact length of time it would take for the Earth to rotate the Big Ear through a signal from space. He did some analysis of the data, and by all indications this powerful, narrowband radio signal was from outside of our solar system. But was it sent by an advanced civilization?
Image of page 49
Image of page 50
  • Spring '17

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes