Re: Sine wave in an envelope

Hello Darryl,


you wrote:
 > [modulate a sine wave with another in SoX?]

What you could do as an easy approach is modulate a sine wave with a
tremolo. Assume a target bit depth of 24bit, a sample rate of 44.1kHz, a
carrier of 1500Hz with a length of 20s and a modulation of 0.5Hz with a
depth of 100%

   sox -n -b 24 -r 44100 test.wav synth 20 sine 1500 tremolo 0.5 100

Tremolo can only do a sine modulation with a fixed phase of 90°.

Even more powerful is the cascading of synth effects. Same logic, the
carrier is amplitude-modulated by a sine with 0.5Hz with the same 20s
length:

   sox -n -b 24 -r 44100 test.wav synth 20 sine 1500 synth 20 sine amod 0.5

If you don't want a full modulation (from 0 to 100%), you can add a
dc-offset to the second waveform.

Hope this helps!


       Best regards,

                 Thomas


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