lecture20 - Wind instruments (technical name: aerophones)...

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Unformatted text preview: Wind instruments (technical name: aerophones) A. Brass instruments The players lips vibrate against each other and against the rim of a cup mouthpiece . Lips act as a valve, introducing puffs of air at just the right time to maintain oscillations of the air column Note that an instrument is classified as brass not because it is made of metal, but because it has this type of mouthpiece, which relies on vibrating lips. B. Woodwind instruments The player blows air against a sharp edge or through a reed The sound vibration usually begins at the mouthpiece. The rest of the instrument magnifies, and turns this vibration into a pretty sound Wind instruments are classified by mouthpiece types: A. Brass Instruments Construction: Mouthpiece Mouthpipe Cylindrical section (with valves) Bell Oscillations in a pipe ... 7 , 5 , 3 , 1 4 = = n L v n f n Trumpet: ( 29 . 3 . 61 4 . 1 4 / 343 4 4 . 1 140 = = = = = n m m s m n L v n f m cm L n 61, 184, 306, 429 Hz Acoustic impedance and impedance curve...
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lecture20 - Wind instruments (technical name: aerophones)...

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