The WAV files on this page are intended to demonstrate the process of amplitude modulation (AM) at frequencies that humans can experience.

A good way to examine each file is to play it in an application that generates sound and shows the waveform as voltage-over-time. Once such application is Microsoft's Windows Media Player with the Visualization set to Bars and Waves : Scope.

  Waveform       Frequency       File size       Duration
Carrier signal 250 Hz  16 kb 4 s
Modulating signal 1 Hz  16 kb 4 s
 
Mixed signals 1 Hz 
& 250 Hz 		 16 kb 4 s
 
  Modulation index: 100%
 
AM waveform "clipped" many  16 kb 4 s
 
AM signal (DSBFC) 249 Hz,
250 Hz 
& 251 Hz 		 16 kb 4 s
 
AM signal with
suppressed carrier (DSBSC)		 249 Hz 
& 251 Hz 		 16 kb 4 s
 
Lower sideband (LSB) 249 Hz  16 kb 4 s
Upper sideband (USB) 251 Hz  16 kb 4 s
 
 
  Modulation index: 50%
AM signal (DSBFC) 249 Hz,
250 Hz 
& 251 Hz 		 16 kb 4 s


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Copyright © 2006 Michael X. Lyons  All rights reserved.