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'SEE' VOICE: SCIENTIFIC PLAYING OLD RECORDINGS WITH MICROSCOPE
2017-08-28
How to listen to an old record? You might say, just find a phonograph and play it. But the reality is not so simple. Now, many old records are facing the crisis of poor preservation and breakage. If these record carriers are damaged, the audio data will be lost. The people who came to save these old records were two particle physicists working at the LHC (Large Hadron Collider). Through microscopes and computers, they have brought old broken records back to life. Before the advent of cameras, artists could also use painting and sculpture to restore the scenes they saw more finely, while recording and restoring sound faced more technical challenges. In 1860, the Frenchman Scott () for the first time successfully recorded sound with modern methods. He designed a sonic recorder based on the structure of the human ear, with three main structures corresponding to the ear canal, the eardrum and the ossicles. Sound is mechanical vibration, sound waves are transmitted to the instrument, and then bristle-like parts (corresponding to the auditory ossicles) attached to a membrane can record the vibration on paper or glass coated with lamp black (carbon black). In this way, Scott got the acoustic curve record in the figure below. This recording does contain information about the sound, but it cannot be reproduced.
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