{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Modulation - CHAPTER CHAPTER Modulation ChapterObjectives...

Info icon This preview shows pages 1–18. Sign up to view the full content.

View Full Document Right Arrow Icon
CHAPTER   CHAPTER   Modulation Modulation
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Chapter Objectives Explain amplitude, frequency and phase  shift modulation Give an example of a modulation technique  used in modems Discuss modem standards Communication, compression etc. Continued
Image of page 2
Continuation of Chapter  Objectives Differentiate between bps and Baud that are  units used for measuring communication  speed Describe analog-to-digital modulation Explain digital-to-digital interface Summarize the different types of signal  conversions Digital-to-analog, analog-to-digital, analog-to- analog and digital-to-digital
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Chapter Modules Amplitude modulation Frequency and phase shift modulation Modems and modulation FM modulation in modems Speed of modulated signals Analog-to-digital modulation Digital-to-digital interfacing
Image of page 4
Overview Digital-to-analog modulation Computer-to-telephone interface Analog-to-digital modulation Digitization of audio Digital-to-digital interface Computer-to-ISDN interface
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Modulation Amplitude Modulation
Image of page 6
Overview of Modulation Computer Modem Serial link RS -232 Phone Line RJ-11 Digital Analog
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Amplitude Modulation (AM) 1 0 1 0 Amp. 1 Amp. 2 1 = Amp. 1 0 = Amp. 2 A B
Image of page 8
Characteristics of Amplitude  Modulation  Amplitude of the analog signal is  modulated One amplitude represents a 0 Another amplitude represents a 1 Frequency remains unchanged in both cases Signals that are modulated at one end are   demodulated at the other end
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Usage Amplitude is susceptible to interference This technique in not normally used in modems  A variation of this technique is used in AM  radio transmission Analog-to-analog modulation takes place
Image of page 10
AM and Radio Transmission Modulated Amplitude Voice Carrier Wave
Image of page 11

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
End of Module End of Module    
Image of page 12
Module Frequency Modulation
Image of page 13

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Frequency Modulation (FM) 1 0 1 0 Freq. 1 Freq. 2 1 = Frequency F1 0 = Frequency F2
Image of page 14
Characteristics of Frequency  Modulation Frequency is modulated  Frequency f1  Represents   1 Frequency f2 Represents   0 The amplitude remains unaltered in both  cases
Image of page 15

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Usage Variations in frequency are easy to detect  They are less susceptible to interference FM and variations  of this technique are  used in modems Easy to implement full duplex transmission  under FM A variation of the FM technique described  here is used in FM radio transmission
Image of page 16
Use of FM in Early Day Modems F1 0 F2 1 F3 0 F4 1 Voice Band- Width Full-duplex Communication A B
Image of page 17

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 18
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

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