Re: Sine wave in an envelope

[Jeff Learman <jjlearman@gmail.com>]

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Hi, I'm trying to do a very similar thing but modulating the audio from a
file.  I want to produce a stereo tremolo by using the sine amod effect,
out of phase on the left and right channels.
LEN=0
OFFSET=0
PHASE=0
PHASE2=180
The following works for mono, producing the desired tremolo in mono:  sox
rd73_064__E4_082.flac x.flac synth $LEN $OFFSET $PHASE 2 sine amod 0.5
I thought the following would work for stereo: sox rd73_064__E4_082.flac
x.flac synth $LEN $OFFSET $PHASE2 2 sine amod $LEN $OFFSET $PHASE2

but I get a parameter error.  Any suggestions?

Thanks!

On Wed, 3 Jun 2020 at 10:34, Dr. Thomas Tensi <t.tensi@gmx.de> wrote:

> 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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