Engineering Reproduction of Sound from Pilsudski's wax Phonograph cylinders

B.毕苏斯基的65个蜡筒被带到北海道大学应用电力研究所，用于复制和研究记录在上面的声音。使用爱迪生式留声机，它的唱针在复制过程中对蜡筒的凹槽施加了大约20克的重压，因此损坏蜡筒的风险绝对是最大的。这是一个问题，因为不仅录制在蜡筒上的声音，而且蜡筒本身也是我们文化遗产的一部分。因此，一种使用非常轻的压力笔的方法被开发出来，作为蜡筒声音的复制系统。然而，还有24个圆柱尚未被复制；由于钢瓶破裂或破碎，不能使用触针法。这些破损的蜡缸被修好了。由于阿伊努人谈话和歌曲的宝贵声音很久以前就消失了，似乎被记录在这些圆筒上，繁殖是最重要的。为了再现这些修复后的圆柱体发出的声音，研究了一种非接触、无损的激光束反射方法。本研究分四个步骤进行：(1)蜡柱的清洗和复制；(2)利用新开发的印模法和激光束反射法进行声音再现；(3)对两种不同的尖峰噪声和随机噪声进行降噪。

B. Pilsudski's sixty-five wax cylinders were brought to the Research Institute of Applied Electricity, Hokkaido University, for reproduction and investigation of the sound recorded on them. Using the Edison-type phonograph, its stylus gives such a heavy pressure of approximately 20 g to the grooves of the wax cylinder in the reproduction process that there is definitely a grest risk of damaging the wax cylinder. This is a problem because not only the sounds recorded on the wax cylinder but also the cylinder itself is part of our cultural inheritance. So a method using a very light pressure stylus was developed as a reproduction system of the sound from wax cylinders. However, there were twenty-four more cylinders that have not yet been reproduced; the stylus method cannot be used because the cylinders are cracked or in pieces. These broken wax cylinders were repaired. Since the valuable sounds of the Ainu talk and songs lost so long ago seem to be recroded on these cylinders, reproduction is most important. To reproduce the sounds from these repaired cylinders, the laser-beam reflection method which is noncontacting and nondestructive was developed.The present research was done by following the four steps: (1) Cleaning and replication of the wax cylinders, (2) Sound reproduction using the tylus method and the laser-beam reflection method which were newly developed, (3) Noise reduction for two different spike-like noise and random noise.