Appendix 1 Analog audio

 

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Figure A1.1 The geniuses of the Edison Labs. The portrait shows Edison seated in center looking suspiciously like Napoleon. Fred Ott is seated on his right and Col. George Gouraud at his left. Standing (left to right) are the dapper W.K.L. Dickson, Charles Batchelor, A. Thedore Wangemann, John Ott, and Charles Brown. There is a phonograph and several recording cylinders on the table. Library of Congress photo.

Before we can understand analog audio recording, it is necessary to understand the nature of sound itself. Sound is simply vibrations in the air; sound as we perceive it is created in our ears as these waves ...

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