AUDIO 程序包符号

AmplitudeModulation

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

AmplitudeModulation[f_c, f_m, m_i, dur, RingModulation->True]
creates a ring-modulated sinusoid.

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To use , 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:

DisplayFunction	Identity	function to apply to sound before returning it
PlayRange	{-1, 1}	range of sound amplitude levels to include
RingModulation	False	whether to use ring modulation
SampleDepth	8	number of bits used to encode sound amplitude
SampleRate	8192	sampling rate per second

The option RingModulation->True specifies that the Sound object created by will contain only two frequencies: the sum and the difference of the carrier and modulating frequencies.
The expression used by is given by .
The expression used by with the option RingModulation->True is given by .
The depth or intensity of the modulation is controlled by the modulation index .
The carrier is said to be overmodulated when .
The best way to understand the effect of is to try it out with different values, usually between 0.1 and 2.0.