调律师在调八度音程的时候都要自觉或不自觉地把八度音程调宽一些,称为“八度延伸”。八度延伸的程度一方面和钢琴的品牌、型号、音区等因素有关;另一方面,也受调律师和演奏家的个人喜好左右。要更加透彻地理解八度延伸的原因和延伸量的大小,我们还得从钢琴弦振动的泛音列及其特点谈起。 Tune lawyers in the tone of the octave should consciously or unconsciously to the octave widened some, known as “octave extension ”. On the one hand, the extent of the octave relates to factors such as the brand, model and sound zone of the piano; on the other hand, it is also influenced by the personal preferences of the lawyers and performers. To understand more thoroughly the reason for the extension of the octave and the size of the extension, we have to start with the overtones of the piano string vibrations and their characteristics.