Re: violin question
From: Pepe le Pew (CaptainLimerick_at_diespammers.joimail.com)
Date: 06/28/04
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Date: Mon, 28 Jun 2004 08:20:42 -0700
On 26 Jun 2004 23:20:04 -0700, Andrew E. Smyth <Rushtown@aol.com> wrote:
> Why don't two violins in the orchestra, each playing middle "C",
> produce sound waves that interfere with each other? That is, why does
> it sound like the troughs and peaks of the sound waves from each
> violin are reinforcing each other, when it's more likely they are
> interfering, or not in sync? Shouldn't two violins sound sporatic,
> and a whole string sections sound just like white noise?
Hi Rushtown,
Why do you ASSume that two sounds coming from different instruments
would interfere with each other? It should be obvious to the observer
that they do not.
No two physical instruments make exactly the same sound. Each has it's
own characteristic timbre. But the real problem is that you are thinking
about the transmission medium of air in terms that are appropriate for
another meduim, electronics. Sound waves travelling over air have a
three dimentional characteristic while sound waves reproduced
electronically have only a single dimension.
Take your nose out of the advanced electronics books and poke it
into some elementry electronics books.
BTW I did have an interesting experience like what you are talking about.
I was on a terrace with a wall to my right and a bell tower further off
to my left. As I was walking the bell began sounding and I noticed it
had a modulating effect to it that I never heard before. I stopped where
I was and the modulating stopped. I moved just a little bit and I heard
the modulation albeit a little slower. I was walking through a spot on
the terrace where I was hearing the initial sound directly and also the
reflected sound (coming from the wall to my right) at varying delay
with the original. When the two sounds cancelled I heard modulation,
when they didn't I just heard the bell.
If you ever get the chance to, walk through a concert hall when the
orchestra is rehearsing. The sound changes dramatically from one side of
the auditorium to the other, front to back and up and down. The sound
also changes as you just turn yourself around. Quite interesting.
OTOH, don't do any of this stuff for yourself. It would just generate
more ridiculous questions from you.
Later,
Pepe le Pew aka Pat Sullivan
This note should have been posted several days ago. I have an ISP
who makes it nearly impossible for me to access their newsserver.
I think they are trying to lose my patronage.
-- PT Barnum was right !
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