UNT PHYS 1251 - mwf30 (31 pages)

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mwf30

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Pages:
31
School:
University of North Texas
Course:
Phys 1251 -
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Physics 1251 The Science and Technology of Musical Sound Unit Unit 3 3 Session Session 30 30 MWF MWF The The Timbre Timbre of of Wind Wind Instruments Instruments Physics 1251 Instruments Unit 3 Session 30 The Timbre of Wind What is the physical difference between a Cornet Trumpet and Flugel Horn Trumpet Cornet The fraction of the horn that is cone cylinder flare Trumpet most cylindrical Cornet more conical Flugel Horn Flugel Horn most conical Physics 1251 Instruments Unit 3 Session 30 The Timbre of Wind 1 Lecture The pitch of a wind instrument is determined by the length and shape of its air column The effective length of the air column is controlled with holes valves and slides Feedback from the resonances of the pipe select the frequency of oscillation of the jet reed or lipvalve The excitation transmission and emittance of the sound in the horn determine the timbre of the instrument Physics 1251 Instruments Unit 3 Session 30 The Timbre of Wind Transverse Flute The flute is driven by air flow against the edge of the embrochure hole 80 20A pressure node exists at the open hole 80 20 Air flow Embrochure Physics 1251 Instruments Unit 3 Session 30 The Timbre of Wind The Single Reed The reed opens and closes like a valve pressurizing the pipe when open closing due to the Bernoulli effect when the air flows 80 20A pressure anti node exists at the reed 80 20 Air flow Tonguing Reed Physics 1251 Instruments Unit 3 Session 30 The Timbre of Wind The Double Reed The reed opens and closes like a valve pressurizing the pipe when open closing due to the Bernoulli effect when the air flows 80 20A pressure anti node exists at the reed Pressure Pulses Air flow 80 20 Reed Tip Physics 1251 Instruments Unit 3 Session 30 The Timbre of Wind The Lip Valve Brass instruments are played by the player s lips that form a lip valve 80 20 A pressure anti node exists at the player s lips 80 20 Louis Armstrong trumpet 19011971 Physics 1251 Instruments Unit 3 Session 30 The Timbre of Wind



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