Yes Key is to add redundancy to signal Encoder adds redundancy appropriate for

Yes key is to add redundancy to signal encoder adds

This preview shows page 21 - 26 out of 26 pages.

Yes: Key is to add redundancy to signal. Encoder adds redundancy appropriate for channel. Decoder exploits and then removes redundancy.
Image of page 21
The Meaning of Information For years, telegraph messages were “compressed” by leaving certain words out, or sending key words that stood for longer messages, since costs were determined by the number of words sent. Yet people could easily read these abbreviated messages, since they supplied these predictable words, such “a” and “the.” For Shannon, information is symbols that contain unpredictable news, like our sentence, “only infrmatn esentil to understandn mst b tranmitd.” The predictable symbols that we can leave out, which Shannon calls redundancy, are not really news.
Image of page 22
The Meaning of Information Another example is coin flipping. Each time we flip a coin, we can transmit which way it lands, “heads” or “tails,” by transmitting a code of “zero” or “one.” But what if the coin has two “heads” and everyone knows it? Since there is no uncertainty concerning the outcome of a flip, no message need be sent at all.
Image of page 23
Outline of the Course Probability and statistics Entropy, relative entropy, and mutual information Data compression Gambling Channel capacity
Image of page 24
Grading Policy Class attendance (x 0.1) Midterm examination (x 0.3) Final examination (x 0.6)
Image of page 25
Image of page 26

You've reached the end of your free preview.

Want to read all 26 pages?

  • Fall '18
  • Phuong Hanh DU

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 You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes