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Hi All,
I am working on generation of DTMF tones. I am able to generate the tones by adding the two
sine waves of different frequencies but they are of the same amplitude.
 Should the amplitude of the two constituent sine waves be different? Does the amplitude of the
constituent sine waves determine the twist of the DTMF tone? 
Waiting for some response,
Thank you all,

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In a message dated Wed, 05 Apr 2006 05:12:08 -0400, 
s...@rediffmail.com wrote:

<<
> Hi All,
> I am working on generation of DTMF tones. I am able to generate the tones by 
> adding the two sine waves of different frequencies but they are of the same 
> amplitude.
> Should the amplitude of the two constituent sine waves be different? Does 
> the amplitude of the constituent sine waves determine the twist of the DTMF 
> tone?
> Waiting for some response,
> Thank you all,
> >>
Hello, Shri:

The Touchtone® dual tone signaling standard was created by AT&T during the 
1950s.

http://en.wikipedia.org/wiki/DTMF

I believe the word "twist" refers to distortion manifested as a mismatch in 
the level of frequency pairs, that naturally occurs with alterations in 
frequency response. A certain amount of twist is acceptable. Normally the tones are 
all sent at the same level.

Kind Regards,
David

David P. Reaves, III
TransLanTech Sound, LLC
Creators of the Award-Winning "Ariane Stereo Audio Leveler"

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