Development of an optical sound reproduction system for negative phonograph cylinders

负型留声机滚筒光学声音再现系统的开发

基本信息

批准号：
09555006
负责人：
UOZUMI Jun
金额：
$ 4.35万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555006/
关键词：
Wax cylinder Galvano Optical reproduction Laser-beam reflection PSD Phonograph Folk music Otojiro Kawakami

项目摘要

It was found recently that many negative phonograph cylinders have been preserved in Berlin, Germany. Since, in the negative cylinder, sound information is encoded in convex portions of the inside wall of the cylinder, a conventional phonograph is inapplicable to the sound reproduction. In the present study, we have developed an optical sound reproduction system for the negative cylinders.1. Compact optical headSound information is recovered by detecting height variations of the sound track on the inside wall of the negative, To this end, a compact optical head to be inserted into the cylinder was designed and constructed using a laser diode, small lenses, mirrors, a beam splitter and a PSD.A relay optics consisting of a lens and a pinhole was inserted in the detection optics to reject stray light effectively and to improve an SNR of reproduced sounds.2. Driving unitIn the driving unit, the negative is held by inserting it into a larger holding cylinder and by fixing it to the holding cylinder with six screws. The holding cylinder is rotated by a DC motor, and the cylinders and motor are mounded on the translation stage, which is driven by a pulse motor to keep a tracking by the laser beam.3. Entire system and sound reproductionAbove components were combined into a system and controlled by a control unit, and the final performance of the system was examined and verified. Sounds were reproduced successfully from some old negative cylinders, in which cylinders of koto and shamisen played and recorded by a Japanese old company of drama shows, led by Otojiro Kawakami, are included.

最近发现，在德国柏林保存了许多负面的留声机圆柱体。由于在负圆柱体中，声音信息是在圆柱体内壁内壁的凸部分中编码的，因此传统的留声机不适合声音复制。在本研究中，我们为负缸开发了一个光学声音繁殖系统1。通过检测负面的声音轨道的高度变化来恢复紧凑的光头信息，直到最后，使用激光二极管，小型镜头，镜子，光束splitter和psd的psdics和pSD的效果驱动效果，将要插入圆柱体的紧凑型光学头是由激光二极管，小镜头，镜子，镜像，镜头，光束splitter和PSD驱动的效果。复制声音的snr.2。驾驶单元驾驶驾驶单元，通过将其插入较大的固定气缸中，并用六个螺钉将其固定在固定缸上。保持圆柱体由直流电动机旋转，并且在翻译阶段将气缸和电动机丘陵丘陵，该阶段由脉冲电动机驱动，以通过激光束保持跟踪。3。将整个系统和声音复制子组件组合到一个系统中，并由控制单元控制，并检查和验证了系统的最终性能。声音从一些旧的负圆柱上成功地复制了，其中包括由Otojiro Kawakami领导的日本旧戏剧公司演奏和录制的圆柱体。