Erhu noise refers to the physical phenomenon that the sound is not harmonious in the process of resonance and resonance. The common causes of erhu noise are now analyzed as follows:

Design Layout Factors

1. Some pianos cannot form a resonant resonance focus area in the piano barrel, the sound is scattered and dull, the bass is thin, the treble is empty, and it is easy to make noise.

2. Some pianos are in the back of the focal area, and the treble is easy to be false, resulting in noise.

3. Some pianos have short effective strings, narrow vibration ranges, high frequencies, and are prone to noise.

Factors in the production process

1. The structure of some pianos is not strict, and the defects of the wood, such as cracks, are not handled properly, resulting in the noise of the "broken bamboo" effect.

2. Some piano skins are too tight, the thickness of the piano skin is uneven, the tension around the skin is uneven, the internal stress is not eliminated, the resonance effect of the piano skin is poor, and there is noise in the treble and certain sounds.

3. Some pianos have irregular verticality and concentricity, uncoordinated resonance, and easy noise.

Factors in the material of the piano

1. Some pianos have defects that cannot be repaired or made up, such as knots, cracks, decay, etc., which affect the resonance and produce noise.

2. Some piano skins are of poor quality, such as insufficient tension and elasticity, and are prone to noise. Common thin leather pianos are the most prone to noise.

Factors at the relevant site

1. Some piano fixing screws are loose, and the metal is in direct contact with the strings.

2. The gap between the vortex rod and the metal components of the piano is sometimes the cause of noise (I have seen a piano, and the metal pulley of the piano vibrates, producing strong metal noise).

Factors on Erhu Accessories

1. The strings do not match the piano, especially the poor quality and thin strings are prone to noise. Strings are also prone to noise due to long-term fatigue and string damage.

2. The vibration-guiding function of the piano code does not match the piano. For example, a thin-skin piano with a strong vibration-guiding piano code is prone to noise.

3. The sound pad does not match the piano, and the size of the material cannot achieve the ideal noise reduction and noise suppression effect.

Factors of human ability to control the piano

1. The player's bowing strength, speed and direction are not harmonious. For example, when he pulls a high note, the strength is strong and the speed is slow, which is prone to noise.

2. There are many bow hairs, narrow string grooves, and too much rosin. Especially in humid climates, too much rosin is prone to noise.