The Principle of the Phonograph

- Oct 16, 2018-

The phonograph is an electric device used to record recordings; it was invented by American inventor Edison in 1877.

On a black turntable, the sound vibration is achieved by an undulating track or groove, and fluctuations in the plane of the turntable reproduce the pressure changes of the sound waves as accurately as possible. As the stylus moves along the groove, the tip slightly vibrates as the groove fluctuates. This vibration is transmitted by a mechanical device to amplify it and is emitted into the air.

When the disc rotates at the same speed as the recording, the sound is accurately recovered. If not, it produces a vibration frequency that is different from the recording frequency. A variety of rustling sounds come from dust, causing extra movement of the stylus.



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