As of Version 11, most of the functionality of the Audio package is built into the Wolfram System. >>


creates a Sound object that is an amplitude-modulated sinusoid, having carrier and modulating frequencies fc and fm, measured in hertz, a modulation index of mi, and a duration of dur seconds.


creates a ring-modulated sinusoid.


  • To use AmplitudeModulation, you first need to load the Audio Package using Needs["Audio`"].
  • Sounds created using amplitude modulation contain three frequencies: the carrier frequency, and the sum and difference of the carrier and modulating frequencies.
  • The following options can be given:
  • DisplayFunctionIdentityfunction to apply to sound before returning it
    PlayRange{-1, 1}range of sound amplitude levels to include
    RingModulationFalsewhether to use ring modulation
    SampleDepth8number of bits used to encode sound amplitude
    SampleRate8192sampling rate per second
  • The option RingModulation->True specifies that the Sound object created by AmplitudeModulation will contain only two frequencies: the sum and the difference of the carrier and modulating frequencies.
  • The expression used by AmplitudeModulation is given by .
  • The expression used by AmplitudeModulation with the option RingModulation->True is given by .
  • The depth or intensity of the modulation is controlled by the modulation index mi.
  • The carrier is said to be overmodulated when .
  • The best way to understand the effect of mi is to try it out with different values, usually between 0.1 and 2.0.

See Also

Sound  FrequencyModulation