[sdiy] Phase shifts and instantaneous frequency

[cheater cheater]

No, the beats are a normal physical phenomenon. Back to physics books, Ian ;)

The original thread's question was about a constant phase relationship
- not a variable one. Of course you can hear a variable phase
relationship, which is called pitch bending. :P

Cheers
D.

On 7/15/08, Ian Fritz <ijfritz at comcast.net> wrote:
> You can *easily* demonstrate to yourself that differences in phase are, in
> fact, audible.  To do this, make a signal with two sine waves at 100 and 201
> Hz.  This is a signal with a slowly varying phase difference between the two
> components.  If the phase differences don't matter, then you will hear a
> steady tone.  If they do matter, then you will hear beats.  In fact, you
> *do* hear beats.  Yes, you can easily detect phase differences between two
> tones.  (I learned about this from one of the websites I ran across during
> our previous discussion of this topic.)
>
>  What's going on?  The beats are a result of nonlinear mixing in the ear!
> They do not occur at low volume levels, or if the signals are presented
> separately to each ear.  You can easily demonstrate this to yourself, also.
> The nonlinear mixing produces a difference tone at 101 Hz, which beats
> against the 100 Hz signal.
>
>  Try it!
>
>   Ian
>
>
>  _______________________________________________
>  Synth-diy mailing list
>  Synth-diy at dropmix.xs4all.nl
>  http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>