Experimental study of Hunan dialect tone is relatively small, only a few dialect points have acoustic study, and especially in urban areas, dialect experiments are even smaller.
而湖南方言声调的实验研究相对较少，只有少数几个方言点有过声学研究，尤其是行政市区的方言实验就更少。
2
Yu-toneacoustic successfully resolved a variety of types of noise and vibration problems.
玉音声学成功地解决了多种类型噪声和振动问题。
3
Methods to check on objective acoustic impedance and subjective pure tone audiometry.