二胡不但为我国广大音乐爱好者所喜闻乐见,而且是我国民族乐队中不可缺少的主要乐器。二胡只有两根弦,与小提琴相比音域就显得窄一些。为了扩大音域,我在原二胡的基础上(增加了两根琴弦)研制出一种改革四胡(见图1)。它的四根弦由低到高定为g、d~1、a~1、e~2。 Erhu is not only loved by the majority of music lovers in our country, but also an indispensable main instrument in our national band. Erhu only two strings, the violin compared to the sound field becomes narrower. In order to expand the range, I developed a reforming Sipho on the basis of the original erhu (with two extra strings) (see Figure 1). Its four strings from low to high as g, d ~ 1, a ~ 1, e ~ 2.