On Mon, 19 Jan 2004 11:24:37 +0000, Ian Molton wrote:

On Mon, 19 Jan 2004 09:32:32 +0000
Don Pearce wrote:

Try 400 and 401 Hz then - far more obvious.

You do not hear a tone at 1Hz in these circumstances - you hear beats.
These are very different. There is no tone, there is no need for any
non-linearity that might generate a tone. You are simply hearing
pressure peaks moving in and out of phase.

Its the same effect though.

No, it absolutely is *not* the same effect.

I agree 1 Hz isnt really a tone, but it is a
signal.

Or are you suggesting that the pressure peaks DONT move in and outr of
phase in the 400/450 case?

This only occurs if you have two separate *sound* sources, it does
*not* occur in a linear system with a single speaker.

It works for piano tuning, but not for amplifiers..............
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Stewart Pinkerton | Music is Art - Audio is Engineering