[Asterisk-Dev] Patch: So tone generator can do modulated tones

Stephen Davies steve at daviesfam.org
Tue Jun 17 15:28:37 MST 2003

On Tue, 17 Jun 2003, Martin Pycko wrote:

> I thought all the tie that the '+' is for making a tone composed of two
> modulated frequencies ...

AFAIK adding two tones is not the same as amplitude modulating one
with the other.  Addition of the samples in the first case,
multiplication in the second.

First comes out with the higher frequency "riding" on the lower.  The
second has the higher frequency with an "envelope" from the lower.

Considered trying an ascii-gram but thought better of it.

Anyway - they do definitely sound different.


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