Re: Re: Subject: Re: [Harp-L] comb material

[Zombor Kovacs <zrkovacs@xxxxxxxxx>]

Sorry, I ment that the vibration is kept constant by
the airflow if it was not clear (in case we blow or
draw permanently). 

But it just sprung to my mind to check the jaw harp.
It is also a vibrating reed. It shows us how does
airflow effect the sound and vibration of the reed. 



--- Zombor Kovacs <zrkovacs@xxxxxxxxx> wrote:

> The music box also induces pressure waves in the
> air.
> Otherwise there would be no noise. In the harmonica,
> the air is moving (or the reed is moving in
> airflow),
> in a music box it isnt. THe main difference is in
> the
> "excitation" of the reed. In the music box it is
> plucked again and again, in the harp it is kept
> constant by flowing air. I would guess if we excited
> the harp reed with a magnetic field somehow, it
> would
> make a very similar sound just putting it to your
> mouth even without blowing. The aerodinamics I was
> talking about is in the airflow itself. I am not
> sure
> how much does the airflow itself contribute to the
> sound. I think it actually contributes only to the
> movement of the reed, which then generates the
> pressure waves in a similar way as in the music box.
> Or?
> 
> 
> --- Garry Hodgson <garry@xxxxxxxxxxxx> wrote:
> 
> > Zombor Kovacs <zrkovacs@xxxxxxxxx> wrote:
> > 
> > > A main difference between the music box reeds
> and
> > the
> > > harp reeds is that one is plucked the otherone
> is
> > > vibrated by an airstream. The harmonica reed
> > vibration
> > > is a much much more complex phenomenon whith a
> lot
> > of
> > > aerodynamics. So I also think, that although the
> > > strings on a guitar vibrate in a similar manner
> as
> > > reeds do in a harmonica, the scales are
> different.
> > 
> > is this so?  it was my understanding, probably
> from
> > something i read
> > here, that harps make sound not by vibrating
> reeds,
> > but by chopping
> > up the airstream in similar fashion to a siren. 
> > this is why the music
> > box analogy has problems, since the sound
> generation
> > mechanism
> > is so different.  
> > 
> > am i misunderstanding?  can someone clarify?
> > 
> > ----
> > Garry Hodgson, Senior Software Geek, AT&T CSO
> > 
> > nobody can do everything, but everybody can do
> > something.
> > do something.
> > 
> > _______________________________________________
> > Harp-L is sponsored by SPAH, http://www.spah.org
> > Harp-L@xxxxxxxxxx
> > http://harp-l.org/mailman/listinfo/harp-l
> > 
> 
> 
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam
> protection around 
> http://mail.yahoo.com 
> _______________________________________________
> Harp-L is sponsored by SPAH, http://www.spah.org
> Harp-L@xxxxxxxxxx
> http://harp-l.org/mailman/listinfo/harp-l
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com