[sdiy] Re: About this LC filter formula questions

[John L Marshall]

Is there a correlation of the sound waves in a pipe and RF in a waveguide? I
think so.

If not terminated the pipe could act as a comb filter delay maybe not all
bad, maybe really bad.

Take care,
John
------------------------------------------------------------------
Pacific Northwest Synthesizer Meeting
August 9, 2003
www.sound-photo.com
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----- Original Message ----- 
From: "harrybissell" <harrybissell at prodigy.net>
To: "The Peasant" <epeasant at telusplanet.net>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, June 01, 2003 4:25 PM
Subject: Re: [sdiy] Re: About this LC filter formula questions


> About the cross sectional area of the tube...
>
> I think that you want a small diameter tube... so that the waves must go
> 'down'
> the tube, and not bounce side to side.  Its obvious that low frequencies
> will go
> straight... but high frequencies could bounce. It will have to do with
> 'some' wavelength
> of sound (in air)... but if its a full wave, 1/2 wave, 1/4 wave... who
> knows.  I'm thinking
> it should be less than 1/2 wave in diameter at the highest frequency.
>
> Also the line should probably be terminated in some acoustic dead
> mass... so that there is
> not reflections or standing waves....
>
> Yes... get a BBD !!!!   :^P
>
> H^) harry
>
> "There ARE some things worse than a BBD....  death is not among them !"
>
> The Peasant wrote:
>
> >
> > > I found that my audio frequency unit made a lot of noise
> > > (source) and received a
> > > lot
> > > of noise...  I considered it a failure and moved on.
> >
> > WOW, this sounds just like my ex-wife!
> >
> > > I
> > > suppose the idea could
> > > be made to
> > > work better, but its a far cry from tape, bbd, or digital
> > > solutions.
> >
> > Worse than BBDs!!????!!!!! Say it isn't so, Harry!!
> >
> > > Maybe we should turn the project over to the Electric
> > > Peasant, who excels in
> > > such
> > > low-tech enterprises.  (see the slinky reverb for
> > > example).  ;^P
> >
> > I've always wanted to experiment with injecting audio into
> > a network of various resonant pipes and containers and
> > installing microphones in different locations, but there
> > are just too many other projects on the go here right now.
> >
> > If you really want to warp sound, put a small microphone as
> > far inside a large sea shell as you can get it. Put the
> > whole thing in a sound-proofed box with a speaker, and have
> > fun!
> >
> > Take care,
> > Doug
> > ______________________
> > The Electronic Peasant
> >
> > www.electronicpeasant.com
>
>