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From:  Reg Boyle <bandb@n...>
Date:  Tue Feb 11, 2003  7:18 am
Subject:  Re: [vocalist] Vibrational Modes, was Re: Pavarotti Mezzo Falso

Please pardon my late response but I need to underline
something Lloyd had to say on "closed quotient".

Lloyd's mention of a satisfactorily QUICK transition from
the closed to the open condition and the opposite, brought
me round to the consideration of a SLOW transition.
The 50% duty cycle produces only odd harmonics if the
rate of change is VERY fast but the slower rate would
produce a mix... odd and even harmonics.

I dispense with my preferred term "duty cycle" and adopt
Lloyd's "closed or open quotient". If both quotients were
say, 5%, then the transition times must obviously be the
other 90%. In this condition the air flow rate would be
distinctly triangular and therefore approximate a sine wave.
This is very falsetto like except that a Fourier analysis
would indicate the presence of a tiny amount of
3rd harmonic. If the closed quotient then altered so that
there was NO actual closure, the 3rd harmonic would
disappear and we would be left with the falsetto.
Great description Lloyd.

Just musing...... Reg.








  Replies Name/Email Yahoo! ID Date  
22564 Re: Vibrational Modes, was Re: Pavarotti Mezzo FalsoEdgewoodVoiceStudioedgewoodvoicestudio Tue  2/11/2003  
22565 The Composer!!!!Reg Boyletranquil2404 Tue  2/11/2003  
22566 Re: The Composer!!!!EdgewoodVoiceStudioedgewoodvoicestudio Tue  2/11/2003  
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