Evolution of Speakers
Evolution of speaker cont.
Modern Speaker of the 21st century
-(1876)Alexander Graham Bell was the second to create the first ever speaker. He was trying to get some ideas off of Reis's work.
-(1877)Werner Von Siemens first used the idea of using an electromagnetic coil to transport signals of the DC transients and also adding telegraphic signals. However, some his his ideas put him in the right start but he didn't know how to amplify sounds out of the speakers. In the near future, his theory was used by various inventors.
-(2013) Over the years, many speakers were made and sold everyday. Speakers are an accessory to music and people's daily lives. A lot of inventors used the same idea but different technology and designs. Such as Philips, Skull Candy, Beats and etc. Today, we are also using earphones and headphones to listen to audio.
What is a speaker?
Evolution of speakers
One of the first modern speakers
- Speakers come in all shapes and sizes, enabling you to listen to music on your iPod, enjoy a film at the theater, and listen to your friends voice over a phone.
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-(1861)Johann Philipp Reis, first developed a simple type of electronic loudspeaker. During his early years he was a teacher at Germany in which he invented the hearing aid that led to his invention of the speakers.
-(1921)C.W. Rice and E.W. Kellogg worked together in Schenectady, New York to create the first modern speaker and the second first electric amplification system. At their first attempt, it made muffle sounds. Several years later, the two finally managed to get a clean crisp audio out of the speakers.
How does a speaker work?
First Radio Broadcast with speakers
sources
In order to translate an electrical signal into an audible sound, speakers contain an electromagnet: a metal coil which creates a magnetic field when an electric current flows through it. This coil behaves much like a normal (permanent) magnet, with one particularly handy property: reversing the direction of the current in the coil flips the poles of the magnet.
-(1927)C.W. Rice and E.W. Kellogg worked together in Schenectady, New York to create the first modern speaker and the second first electric amplification system. At their first attempt, it made muffle sounds. Several years later, the two finally managed to get a clean crisp audio out of the speakers.
http://www.physics.org/article-questions.asp?id=54
http://www.timetoast.com/timelines/evolution-of-speakers--2