Amplitude Demodulation

In this lab, students investigate two methods to recover an amplitude modulation (AM) signal in order to develop an understanding of the demodulation process in the time and frequency domain. First, students will generate an AM signal using data from a file, and then they will 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 will use the product detection method, which requires some understanding of mathematics to recover the original signal.
by Emona Tims


This is lab 5 of 20 in the course, Communications Principles.


After completing this lab, students will be able to:
  1. Generate a real AM signal.
  2. Examine a real AM signal with scope and compare it to its original message.
  3. Use multiple message sources in an 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.


  • 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.


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.

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