As a bell, or bell, is defined as the end of the tube a woodwind instrument. It is mostly cylindrical ( as in the modern flute ) or conical ( in the oboe or clarinet). The bell has a significant influence on the tone of an instrument. So the oboe with a conical bell sounds open and bright, the oboe d' amore with pear-shaped Liebesfuß covered and more nasal. A very wide, cone-shaped bell is used in some instruments primarily for tone shaping ( shawm zurna ), with other instruments primarily for decorative purposes ( Borduntrichter on the market bagpipe ).
In brass instruments the bell ( horn ) corresponds to the last strongly funnel-shaped widening end of the sound track. The opening angle of the bell has an influence on the harmonic content of the sound in each instrument. Basically it can be said:
- The greater the angle, the " bright " of the sound (for example, a trumpet ).
- The smaller the angle, the more "softer" sound (for example, flugelhorn ).
The length of the actual sound piece is on manufacturing processes, subsequent parts are often referred to as the impetus for larger instruments or bracket or are directly executed as a tuning slide.
Fundamental influence on the exact interval distance within the harmonic series also has the scale length of the sound piece, depending on its percentage in the entire length of instrument:
- With a normal B- trumpet is about 50 % (60 cm).
- At a B- trombone are about 20% ( 50 cm).
- At a B- tuba are about 13% (70 cm).
The bell at the French horn is sometimes performed unscrewed. This is for the ease of portability, since the instrument can thus be more compact packaging. Especially with horns of the bell is also called falls.