Principle of phonograph

When recording, different shades of marks are left on the record according to the strength of audio. When playing, these marks are induced by the stylus, then the current is induced by the coil, and finally the sound is generated by the amplifier.

To put it simply, it is:

Recording: using the energy of sound, using a needle to score the sound disc;

release: use the pickup probe to restore the groove on the sound disk to sound.

this is actually similar to the principle of tapes and CDs.

The birth of the phonograph

The phonograph was born in 1877. The man who invented the phonograph in the world is the world-renowned invention king-Thomas Alva Edison.

According to the phenomenon that the diaphragm in the telephone transmitter vibrates with the voice, Thomas Alva Edison made an experiment with a short needle, from which he got great inspiration. The speed of speaking can make the short needle vibrate correspondingly. Then, in turn, this vibration will certainly make the original voice. So he began to study the problem of voice reproduction.

On August 15th, 1877, Thomas Alva Edison asked his assistant Chrissy to make a strange machine consisting of a big cylinder, a crank, a receiver and a diaphragm according to the pattern. Thomas Alva Edison pointed to this strange machine and said to his assistant, "This is a talking machine." He took out a piece of tin foil and rolled it on a metal cylinder engraved with spiral grooves, so that one end of the needle gently rubbed the tin foil and the other end was connected to the receiver. Thomas Alva Edison shook the crank and sang "Mary has a little lamb, like a snowball ..." into the receiver. After singing, put the needle back in its original place and gently shake the crank again. Then, the machine slowly turned round and round, and sang "Mary has a little lamb ...", just like what Thomas Alva Edison sang. The assistants on the side were speechless with surprise when they met a talking machine.

The news of the birth of "talking machine" caused a sensation all over the world. In December, 1877, Thomas Alva Edison publicly performed the phonograph, which was immediately praised by the public as "the Napoléon Bonaparte of science" and was one of the three most exciting inventions in the 19th century.

The phonograph designed by American Thomas Alba Edison in 1877 is the earliest recording device in the world.

On December 6th of the same year, John Clausi, Edison's assistant and mechanic, made the first prototype and recorded the song Mary's Goat sung by Edison with this prototype.