How the same music note can sound different?

[duoheer]

Hey guys, I have 2 questions:
1. If you press the loudness pedal on a piano and sing a note, a sound usually comes from the piano, why?
2.With a trombone, a skilled player will produce an attractive sound, whereas an unskilled player will produce an unattractive sound while playing the same note. Why?
Thank guys

 

[Meir Achuz]

1. The loudness pedal removes th hammers from the strings.
When you sing a note, the strings of the same (or close) frequency to your note (or overtones) vibrate in resonance.

2. Attractiveness of the sound is subjective, but it depends on the frequency and distribution of the overtones. This is determined by the interaction of the lip with the mouthpiece, the volume of blowing, and
the placement of the tube. These are all too hard to calculate, but an experienced and talented player with a good ear learns to adjust all effects to create what he hears as pleasing.

 

[charng]

I can provide an explanation for why the same music note can sound different in these scenarios. The key factor in determining the sound of a note is the frequency of the sound wave being produced. This frequency is determined by the length, thickness, and tension of the instrument's strings or the air column in a brass instrument.

1. When pressing the loudness pedal on a piano, the hammer inside the piano strikes the string with more force, causing it to vibrate at a higher amplitude and produce a louder sound. This also changes the frequency of the sound wave, making it slightly different from the note played without the pedal. Additionally, when singing a note, the human voice produces a different type of sound wave compared to a piano, resulting in a slightly different sound even when singing the same note.

2. The difference in sound between a skilled and unskilled trombone player can be attributed to the player's control over the instrument's air column. A skilled player has better control over the air pressure and speed, which affects the frequency and quality of the sound wave produced. On the other hand, an unskilled player may have difficulty controlling these factors, resulting in a less desirable sound. Additionally, a skilled player may also have a better understanding of embouchure (mouth position) and use of the slide to produce a more accurate and pleasing sound.