Klarinet Archive - Posting 000051.txt from 2010/08

From: dickwilliams <dickwilliams@-----.com>
Subj: Re: [kl] Fundamental error on
Date: Thu, 12 Aug 2010 11:55:55 -0400

Octave???

----- Original Message -----
From: Keith Bowen <keith.bowen@-----.com>
To: The Klarinet Mailing List <klarinet@-----.com>
Subject: Re: [kl] Fundamental error on
http://www.woodwindcourse.co.uk/user/image/clarinet_bore_design.doc
Date: Thu, 12 Aug 2010 15:44:00 +0100

>The difference between you is that Tony is right and you
>are "not"!
>
>Do read the references he suggests.
>It isn't very intuitive, but it is why a clarinet behaves
>differently from an oboe or flute(hence is an octave lower
>for the same tube length).
>
>
>Keith
>
>
>Sent from my iPhone
>
>On 12 Aug 2010, at 14:46, Diego Casadei
><casadei.diego@-----.com> wrote:
>
>> Dear Tony,
>>
>> I said exactly the same thing as you, apart from the "No"
>> :-)
>> The reed is the sound generator hence it cannot be a
>> pressure node.
>> Cheers,
>> Diego
>>
>>
>> Tony Pay wrote:
>>> On 12 Aug 2010, at 08:22, Diego Casadei wrote:
>>>
>>>> Dear all,
>>>>
>>>> there is one big mistake on
>>>>
>http://www.woodwindcourse.co.uk/user/image/clarinet_bore_design.doc
>>>> which is worthwhile explaining here (few other details
>>>> have been already commented by other people).
>>>>
>>>> In every wind instrument (*) the sound generator is
>>>> just at the edge of the pipe which is controlled by the
>>>> mouth. In particular, for the reed instruments the
>>>> sound generator is the vibrating reed (or reeds for
>double-reed winds). This means that the clarinet reed
>>>> exerts the pressure with the maximum amplitude on the
>>>> column of air which is resonating inside the pipe.
>>>>
>>>> In diagrams like the drawing on page 4 of the document
>>>> mentioned above, a "node" is a position along the tube
>>>> in which the amplitude is minimum (ideally, it is
>>>> null). The paper calls "antinode" a position which
>senses the maximum amplitude (**). Hence, the diagram on
>>>> page 4 is clearly wrong: a node is not allowed at the
>>>> reed position, because that is by definition the only
>>> certain place in which the amplitude is maximum.
>>> No, the mouthpiece end of the clarinet functions like a
>>> closed tube, and so is a displacement node (or a
>>> pressure antinode).
>>> See Benade, or eg:
>>>
>>>
>>>
>>>
>http://www.phys.unsw.edu.au/jw/clarinetacoustics.html#pipe
>> Tony
>> --
>>
>> Diego Casadei
>>
>>
>__________________________________________________________
>> Physics Department, CERN
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>Diego.Casadei@-----.ch
>>
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