Waves and Phases

Well done that man!

It is often quite weird to walk around a room with two lousdpeakers in that
are producing the same tone in a low frequeny. There is also an intensity
increase near boundaries such as walls etc.

M

> From: tuning@yahoogroups.com
> Reply-To: tuning@yahoogroups.com
> Date: 19 Oct 2002 10:42:47 -0000
> To: tuning@yahoogroups.com
> Subject: [tuning] Digest Number 2260
>
>
> Message: 13
> Date: Fri, 18 Oct 2002 23:37:27 -0000
> From: "wallyesterpaulrus" <wallyesterpaulrus@yahoo.com>
> Subject: Re: Survey: Your favorite sizes for thirds?
>
> --- In tuning@y..., prophecyspirit@a... wrote:
>
>> I think my use to the term "in
>> phase" is what musical people and music physicists mean.
>
> i'm afraid i must disagree. "out of phase" is perfectly beatless,
> just like "in phase" -- it's just that out of phase is *much* quieter
> than "in phase". this is well-known to anyone who has ever hooked up
> a pair of stereo speakers :), or worked at any length with pure-ji
> electronic tone generators.
>
> moreover, two phase-locked sound sources, *separated* in space, will
> produce a standing pattern of "in phase" and "out of phase" regions
> in space. as you move through the space, you will experience
> oscillating intensities as you pass, successively, through regions of
> reinforcement and cancellation.
>
> let me suggest this high school tutorial to everyone (even PhDs!):
>
> http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l3a.html
>