The violin is a string instrument played with a bow, which can not only play continuous, soothing, sweet, and melodious melodies, but also perform passionate, exciting, and cheerful pieces. Due to its beautiful sound quality, wide frequency range, and complex playing techniques, it plays a crucial role in symphony orchestras.
Why can a violin produce such wonderful music? Every beautiful melody is composed of a fundamental note and overtones. Each note can be regarded as the superposition of many harmonic vibration waves with different frequencies, phases, and amplitudes. Generally, the timbre of a sound is determined by the number, frequency, and amplitude of overtones. The higher the vibration frequency of the sound source, the higher the pitch it sounds; the lower the vibration frequency, the lower the pitch. The harsh high notes and deep bass we often hear are produced by different vibration frequencies. If the vibration waves of the melody are emitted through a resonant empty box, the vibration waves will change and the volume will increase.
The violin has four strings. When the bow rubs against the strings, it causes the strings to vibrate, which in turn causes the soundboard to vibrate through the bridge and the back plate to vibrate through the soundpost. This kind of vibration is actually a complex form of vibration, including transverse vibration, longitudinal vibration, torsional vibration, and frequency-doubled vibration. However, transverse vibration is the most crucial and important form of sound production. Other vibrations only serve to appropriately enhance the amplitude of transverse vibration. Therefore, its frequency spectrum simultaneously includes a fundamental note and a series of accompanying overtones, and the number and intensity of overtones determine the timbre.
The ideal state of violin playing should be to make it be in a sub-harmonic resonance. These vibration waves can be superimposed with the same frequency sounds through the resonant box (the body of the violin), and the result will be that the original sound amplitude becomes larger and the volume is strengthened, allowing the violin sound to be fully emitted and spread to every corner around. The vibration of violin music also depends on the string and its tension, the quality of the bridge, the pressure and speed of the bow, and the playing techniques such as bowing, fingering, and vibrato of the player. Through these complex changes, the violin can produce wonderful music.