The WAV files on this page are intended to demonstrate the process of frequency modulation (FM) 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       Modulation index       Frequency       File size       Duration
Carrier signal 250 Hz 16 kb 4 s
Modulating signal 1 Hz 16 kb 4 s
 
FM waveform    10     240-260 Hz 16 kb 4 s
FM waveform    25     225-275 Hz 16 kb 4 s
FM waveform    50     200-300 Hz 16 kb 4 s
FM waveform   100     150-350 Hz 16 kb 4 s
FM waveform   200      50-450 Hz 16 kb 4 s



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Copyright © 2006 Michael X. Lyons  All rights reserved.