SPEAKER: Dr Bernard Richardson
Resonances in tubes are common classroom demonstrations to bring home concepts of waves, standing waves and vibrations. These simple demonstrations would also seem to describe the basic acoustical function of the brass and woodwind instruments found in the symphony orchestra or jazz band. Why is it, then, that a trumpet – a tubular instrument closed at one end by the player’s lips and open at the other end – plays the full harmonics series? Simple theory seems to imply that we should only produce the odd harmonics. “Round the horn” is a demonstration lecture which looks a little more closely at the way in which brass instruments create sounds, from the buzzing of the lips to the importance of that magnificent flaring bell.