Date: Thu, 22 Apr 2010 16:20:43

Author: Erich Burton

Subject: Re: sound demo/question

Post:

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Thinking about other high-Q resonant systems, it doesn't take much
coupling to produce sympathetic resonance; consider the five metronomes
on the rolling platform demo.

A better way to show constructive and destructive interference is with
two speakers driven by an oscillator. For a broad frequency (and therefore
low-Q) speaker, coupling won't have any discernible effect.

-Erich


Anthony Lapinski wrote:

> I am puzzled about something. I use two 256-Hz resonant tuning forks and
> an oscilloscope for some sound activities. When I hit both forks, the
> sound appears louder that just one oscillating. The mic picks this up, and
> the scope shows a higher (double) amplitude -- constructive interference..
> This always works. However, shouldn't there be places in between the forks
> that show destructive interference? [...]
>
>

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Thinking about other high-Q resonant systems, it doesn't take much =
coupling to produce sympathetic resonance; consider the five metronomes=
on the rolling platform demo.A better way to show constructive and =
destructive interference is with
two speakers driven by an oscillator. For a broad frequency (and therefore<=
br>low-Q) speaker, coupling won't have any discernible effect.-=
ErichAnthony Lapinski g> wrote:
I am puzzled abou=
t something. I use two 256-Hz resonant tuning forks and
an oscilloscope for some sound activities. When I hit both forks, the
sound appears louder that just one oscillating. The mic picks this up, and<=
br>
the scope shows a higher (double) amplitude -- constructive interference..<=
br>
This always works. However, shouldn't there be places in between the fo=
rks
that show destructive interference? [...]



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From tap-l-owner@lists.ncsu.edu Thu Apr 22 16:21:00 2010

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