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When the lips are open, a pulse of air is released into the instrument and causes a longitudinal wave1 to travel down the tube at the speed of sound (780 m.p.h.) towards the bell where most2 of it is reflected back into the instrument to create and support a resonance.
In general, a rapidly flaring bell is added to the end of the instrument to reduce the impedance mismatch as the sound emerges from the instrument, thus increasing the ability of the instrument to radiate sound. Read More.
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Why do brass instruments have a bell?
To increase the radiation efficiency, the end of the piping is flared into a bell. This flaring increases the radiation into the air so that the audience can hear the instrument, but even with the bell attached, the majority of the sound stays inside the instrument. The explanation of how the trumpet is constructed is now
- Frequency and Sound Waves
- Playing Softly and Loudly
- The Brass Instrument Is A 'Closed' Pipe
Brass players can make musical sounds with just their lips, as you'll hear in the sound files below. This is one of the first things a brass player learns: you close your mouth, pull your lips back in a strange smile, and blow. The result may be anywhere between a low pitched 'raspberry' or a high pitched musical note, depending on the tension and ...
In this figure, the two upper figures are spectra that were taken over the first and last 0.3 seconds of the sound file. The spectrogram (lower figure) shows time on the x axis, frequency on the vertical axis, and sound level (on a decibel scale) in false colour (blue is weak, red is strong). In the spectra, note the harmonics, which appear as equa...
The shape of the pipe varies widely among instruments. For the modern instruments, there is a section of tubing with constant diameter (this includes the slide of the trombone and the section containing the valves of other instruments). On the upstream end is a mouthpiece, which has a little cup-shaped section and a constriction. At the other is a ...
The Bell Effect. Besides being a very effective sound radiator, the bell of a brass instrument affects its acoustics by raising the lower resonances from those of a closed tube toward a more useful harmonic sequence. The lowest resonance is shifted up the most. When the overall length is adjusted, the high resonances can be left unchanged.
In general, a rapidly flaring bell is added to the end of the instrument to reduce the impedance mismatch as the sound emerges from the instrument, thus increasing the ability of the instrument to radiate sound.
: the stroke or sound of a bell that tells the hour. Why do instruments have bells? effect on musical instruments In general, a rapidly flaring bell is added to the end of the instrument to reduce the impedance mismatch as the sound emerges from the instrument, thus increasing the ability of the instrument to radiate sound.
