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Sunday, May 27, 2007





[[InStRuMeNt 0f ThE wEeK - TRUMPET]]














The trumpet is the highest brass instrument in register, above the horn, trombone, baritone, euphonium and tuba. A musician who plays the trumpet is called a trumpet player or trumpeter. The most common trumpet by far is a transposing instrument pitched in B flat - the note read as middle C sounds as the B flat 2 semitones below - but there are many other trumpets in this family of instruments.




















The trumpet is made of brass tubing bent into a rough spiral. Although the bore is roughly cylindrical, it is more precisely a complex series of tapers, smaller at the mouthpiece receiver and larger just before the flare of the bell begins. Careful design of these tapers is critical to the intonation of the instrument. Sound is produced by blowing air through closed lips, producing a "buzzing" sound into the mouthpiece and starting a standin wave vibration in the air column inside the trumpet. The player can select the pitch from a range of overtones or harmonics by changing the lip aperture. There are three piston valves, each of which increases the length of tubing when engaged, thereby lowering the pitch. The first valve lowers the instrument's pitch by a whole step (2 semitones), the second valve by a half step (1 semitone), and the third valve by one-and-a-half steps (3 semitones). When a fourth valve is present, as with some piccolo trumpets, it lowers the pitch a perfect fourth (5 semitones). Used alone and in combination these valves make the instrument fully chromatic, i.e., able to play all twelve pitches of Western music. The sound is projected outward by the bell.












The mouthpiece has a circular rim which provides a comfortable environment for the lips' vibration. Directly behind the rim is the cup, which channels the air into a much smaller opening (the backbore or shank) which tapers out slightly to match the diameter of the trumpet's lead pipe. The dimensions of these parts of the mouthpiece affect the timbre or quality of sound, the ease of playability, and player comfort. Generally, the wider and deeper the cup, the darker the sound and timbre.











On any trumpet, cornet, or flugelhorn, pressing the valves indicated by the numbers below will produce the written notes shown - "OPEN" means all valves up, "1" means first valve, "1-2" means first and second valve simultaneously and so on. The concert pitch which sounds depends on the transposition of the instrument. Engaging the fourth valve, if present, drops any of these pitches by a perfect fourth as well. Within each overtone series, the different pitches are attained by changing the embouchure, or lip position and tightness, along with increasing air velocity. Standard fingerings above high C are the same as for the notes an octave below (C sharp is 1-2, D is 1, etc.).
Note that the fundamental of each overtone series does not exist - the series begins with the first overtone. Notes in parentheses are the sixth overtone, representing a pitch with a frequency of seven times that of the fundamental; while this pitch is close to the note shown, it is slightly flat relative to equal temperament, and use of those fingerings is generally avoided.





The fingering schemas arises from the length of each valve's tubing (air passing through longer lengths of tubing produces a lower pitch). Valve "1" increases the tubing length enough to lower the pitch by one whole step, valve "2" by one half step, and valve "3" by one and a half steps. This schema and the nature of the overtone series create the possibility of alternate fingerings for certain notes. For example, third-space "C" can be produced with no valves engaged (standard fingering) or with valves 2-3. Also, any note produced with 1-2 as its standard fingering can also be produced with valve 3 - each drops the pitch by 1-1/2 steps. Alternate fingerings may be used to improve facility in certain passages. Extending the third valve slide when using the fingerings 1-3 or 1-2-3 further lowers the pitch slightly to improve intonation.


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