Frequency bandwidth of a 'hand clap' - ? please help!
Micheal Mcveigh
I'm presently designing an electronic product which is turned
on/off with a clap sound. Well, what I'm trying to find out is at
what is the bandwidth of a clap (roughly!) sound?
Mike
Micheal Mcveigh
I'm presently designing an electronic product which is turned
on/off with a clap sound. Well, what I'm trying to find out is at
what is the bandwidth of a clap (roughly!) sound?
Mike - mbge...@fs1.ee.man.ac.uk
Greg J Szekeres
In article <55ai04$6...@yama.mcc.ac.uk>,
Micheal Mcveigh <mbge...@fs1.ee.man.ac.uk> wrote:
>I'm presently designing an electronic product which is turned
>on/off with a clap sound. Well, what I'm trying to find out is at
>what is the bandwidth of a clap (roughly!) sound?
You may have to also watch not only bandwidth, but peak
spectrum frequencies.
Try posting to alt.science.physics.acoustics
greg
Jim Potter
Micheal Mcveigh <mbge...@fs1.ee.man.ac.uk> wrote:
>I'm presently designing an electronic product which is turned
>on/off with a clap sound. Well, what I'm trying to find out is at
>what is the bandwidth of a clap (roughly!) sound?
>
>Mike
>
>
>
A sharp hand clap is pretty close to an impulse function, which
contains all frequencies. Probably it rolls off eventually, but I'd
bet its fairly broad. A fun experiment, which I have done many times,
is to make a sharp handclap some distance from a brick wall. The
velocity of sound varies slightly with frequency (dispersion) so the
different frequency components return at different times, The
resultant echo is a "chirp", a swept frequency. I don't have a good
enough era (or memory) to tell you which arrives first, the low
frequencies or the high, but the echo sounds pretty neat and not at
all like a handclap.
Jim
James M. Potter, President TEL: (505) 662-5804
JP Accelerator Works, Inc. FAX: (505) 662-5210
2245 47th Street EMAIL: jpo...@jpaw.com
Los Alamos, NM 87544-1604 URL: http://www.jpaw.com
Bob Wilson
Micheal Mcveigh (mbge...@fs1.ee.man.ac.uk) wrote:
: I'm presently designing an electronic product which is turned
: on/off with a clap sound. Well, what I'm trying to find out is at
: what is the bandwidth of a clap (roughly!) sound?
You mean that there will soon be a competitor for the "Clapper"?? I can
hardly wait!
Bob.
Allen M. Ashley
Put a good mike on a scope and see what the time duration of the clap
is (say tau). the bandwidth is about 2/tau. If there is appreciable
content at 40khz then the pulse width of one handclap must be
less than 50 microsec.
--
==============================================
Allen Ashley ash...@alumni.caltech.edu
=============================================
Robert Macy
IW>Micheal Mcveigh <mbge...@fs1.ee.man.ac.uk> wrote:
IW>>I'm presently designing an electronic product which is turned
IW>>on/off with a clap sound. Well, what I'm trying to find out is at
IW>>what is the bandwidth of a clap (roughly!) sound?
Buy a "Clapper" (around $10) and just take it apart and see how they do
it.
- Robert -
rober...@engineers.com
* OLX 2.1 TD * Dad's sick! The computer isn't on.
James Phillips
Allen M. Ashley (ash...@alumnae.caltech.edu) wrote:
: Put a good mike on a scope and see what the time duration of the clap
: is (say tau). the bandwidth is about 2/tau. If there is appreciable
Determine the duration of the shortest part of the waveform that you can
separate and call a pulse, and take 2/(duration of that).
To see single events on an analog (non-storage) scope, make a hood
(from cardboard rolled up) that fits the bezel around the CRT and your
face snugly (cutout for your nose). Get dark adapted. Then you can
see orders of magnitude fainter traces. Cheap, easy, and gives the
satisfaction of using your senses well.
--
James Phillips Harvard-Smithsonian Center for Astrophysics
Opinions mine, not Harvard's or Smithsonian's.