Amplitude Demodulation

In this lab, students investigate two methods to recover an amplitude modulation (AM) signal to develop an understanding of demodulation process in the time and frequency domain. First, students will generate an AM signal using data from a file and then use the envelope detector method to recover the original message by connecting the AM signal to a rectifier and the low-pass filter module on the Emona Communication board. Next students use product detection method which requires some understanding of mathematics to recover the original signal.
by Emona Tims
This is module 5 of 22 in the course, Communications Principles.

LEARNING OBJECTIVES


After completing this lab, students will be able to:
  1. Generate an real AM signal.
  2. Examine a real AM signal with scope and compare it to its original message.
  3. Use multiple message sources in your AM examination.
  4. Demodulate an AM signal using two methods.
  5. Describe the effects and meaning of over and under modulation of the carrier.
  6. Compare original and demodulated signals.
  7. Explain the term” product modulation” as well as the math.
 

REQUIRED SKILLS 

  • Basic proficiency using ELVIS III Instruments
  • Basic Circuits Knowledge

Emona Communications Board for NI ELVIS III

Application board for the NI ELVIS III developed to teach introductory digital and analog communications topics using a completely hands-on approach.

NI ELVIS III

Engineering laboratory solution for project-based learning that combines instrumentation and embedded design with a web-driven experience, delivering a greater understanding of engineering fundamentals and system design.

Required Software

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Required Hardware

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