The waveform of the musical sound changes periodically and has a certain law of change.

1. Introduction to musical sounds:

Music sounds are sounds with a fixed pitch produced by regular vibrations of pronunciation objects, such as piano, violin, erhu, etc., which can produce musical sounds. Musical instrument, sound is the most important and basic material used in music. The melody, harmony, etc. in music are all composed of sound.

2. Musical tone system:

The sum of the tones with fixed pitches used in music is called the musical tone system. According to the commonly used twelve equal temperament, starting from the lowest bass (each There are approximately 97 tones in the entire musical sound system.

The sounds in the musical sound system are arranged in ascending order (from low to high or descending (from high to low)), which is called a tone sequence. We can clearly see the notes and tone sequences used in the musical tone system on the piano.

The modern standard piano is the instrument with the widest range. It has 88 keys and can play 88 tones with different pitches. In other words, the piano has 88 tones with different pitches. Other sounds are rarely used in music.

Three elements of musical sound:

1. Loudness:

The intensity of sound perceived by the human ear is called loudness. Loudness is related to amplitude, distance of propagation and dispersion of sound. In physics, the amplitude of vibration is called amplitude. The greater the amplitude, the greater the loudness.

2. Pitch:

(1) People call the pitch of a sound a pitch. The faster the vibration, the higher the pitch.

(2) The number of vibrations per second is called frequency, represented by the letter f, the unit is Hertz, and the symbol is Hz. The faster the vibration, the higher the frequency, the higher the pitch, and the crisper it sounds; the slower the vibration, the lower the frequency, the lower the pitch, and the deeper it sounds.

(3) The speed of sound has nothing to do with frequency: During the propagation process of sound, the vibration frequency remains unchanged and the pitch remains unchanged; the speed of sound propagation in the medium has nothing to do with the frequency of vibration. In the same medium, the frequencies are different. sound travels at the same speed.

3. Timbre:

Also called timbre, it reflects the quality and characteristics of the sound. We distinguish the sounds produced by different people and objects mainly because of the different timbres. The timbre is related to the material, structure and other factors of the sound body.