[sdiy] Harmonic content of the "sigmoid" half-sine wave

[Jerry Gray-Eskue]

Let me try to rephrase the question. For the sum and difference of the
frequencies to be created we must have a Multiplication ( Modulation ) of
one frequency by the other.

Will we have a Modulation of the frequency in a speaker as both frequencies
are driving a shared mechanical motion of the speaker cone?

-----Original Message-----
From: Ian Fritz [mailto:ijfritz at comcast.net]
Sent: Thursday, June 04, 2009 11:57 AM
To: Jerry Gray-Eskue; Synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] Harmonic content of the "sigmoid" half-sine wave


At 10:22 AM 6/4/2009, Jerry Gray-Eskue wrote:
><<The beat frequency is the (a-b)/2 frequency.>>
>
><<There is no difference frequency produced.  Beats and difference tones
are
>different thing.>>
>
>For an electronic signal I can see and grasp this as the case, but for us
to
>hear the signal we must use some form of mechanical transducer, a speaker
or
>the body of an acoustical guitar for example.

Well, the speaker and the pressure in your eardrum follow the electronic
signal (ideally).  So I'm not really following your question.