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From: "Dr. Thomas Tensi" <t.tensi@gmx.de>
To: sox-users@lists.sourceforge.net
Subject: Re: Sine wave in an envelope
Date: Wed, 3 Jun 2020 16:33:19 +0200
Message-ID: <72549934-94d1-6b25-19e8-54cef71361f6@gmx.de> (raw)
In-Reply-To: <C12EB366-3F17-4AB7-8006-F5289067042F@contoso.com>

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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Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-03 11:38 Darryl Lewis
2020-06-03 14:33 ` Dr. Thomas Tensi [this message]
2020-06-03 15:05   ` Darryl Lewis
2020-06-03 15:13     ` Dr. Thomas Tensi
2020-06-07 21:05   ` Jeff Learman
2020-06-08 11:11     ` Dr. Thomas Tensi
2020-06-08 12:20       ` Jeff Learman
2020-06-08 15:13         ` Dr. Thomas Tensi
2020-06-08 19:24         ` Jeff Learman

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