Impedance technique based piano-soundboard acoustic evaluation experiment device

Abstract

The invention discloses an impedance technique based piano-soundboard acoustic evaluation experiment device for a piano soundboard. The piano-soundboard acoustic evaluation experiment device is characterized by comprising an impedance analyzer, a piano soundboard, a first piezoelectric sensor, a second piezoelectric sensor, a third piezoelectric sensor, a fourth piezoelectric sensor, a computer and a soft processing system thereof. According to tests of the experiment device and an evaluation method, sweeping frequency is directly carried out in a bass area, a middle area and a high-pitch area of the piano soundboard through the impedance analyzer with no need to allow a player to play the piano, an impedance spectrogram of the piano soundboard in a sweeping frequency range can be tested out, and quality of the piano soundboard is judged according to the impedance spectrogram of the piano soundboard. The acoustic evaluation experiment device is simple in structure and reasonable in design, human factors in piano tone evaluation with a traditional method are overcome, the quality of piano tone can be evaluated objectively, and a brand-new piano soundboard evaluation method is provided for piano manufacturers.

Description

Technical field [0001] The present invention relates to the field of impedance technology and piano production technology, in particular to an acoustic evaluation experimental device for piano soundboards based on impedance technology. Background technique [0002] First of all, the piano soundboard is one of the key parts of the piano. It is an important part related to the volume and tone of the piano. It is composed of a wooden soundboard with nearly 230 strings and a cast iron frame that is connected with it. The piano volume is amplified by the piano soundboard. More than 220 strings are divided into several groups to form a string system: the average tension of each string is about 90 kg, and the total tension of the entire piano is about 20 tons. Because the strings, the iron frame and the soundboard are all elastic, they become a comprehensive elastic body with great internal stress after the strings are tightened. Under the hammer strike, the strings and the elastic bod...

AI Technical Summary

Problems solved by technology

Traditional musical instrument acoustic evaluation needs to be carried out in a professional acoustic laboratory. Players are required to play piano music, and judges sitting in different positions in the acoustic laboratory make evaluations. It can be seen that there are human factors in the evaluation

Images