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Speakers

This version was saved 9 years, 10 months ago View current version     Page history
Saved by Omer Asmat
on April 19, 2011 at 6:41:39 pm
 

Speakers

 

 

A speaker is a device that converts electrical signals to sound waves. It is a transducer; a transducer is a device that converts one form of energy to another. Speaker may be referred to just one transducer or an integration of many transducers and filters.

 

 

Table of contents:

  1. History

 

Invention of the first Loudspeaker:

 

The first electrical speaker device was constructed by Alexander Graham Bell in 1876 for the purpose of making the telephone.

 

 

 

 

 

 

 

Later Ernst Siemens and Nicola Tesla improved over Bell’s invention in 1877 and 1881

  

 

Horace Short patented a loudspeaker design that uses compressed-air mechanism in 1898.

 

 

Pathe and Victor Talking Machine Company were few companies that incorporated the compressed-air speakers in their players but the sound quality was poor and producing low volume sound was not possible.

 

 

In the more advanced design we use moving coil transducer, which was patented by Chester W. Rice and Edward W. Kellogg in 1924. The moving coil transducer used electromagnets as permanent magnets.

 

 

It was only in the 1930s that filters were used in the speakers to increase the level of sound pressure, frequency response and overall quality of the device output.

 

 

 

The Shearer Horn System for Theatres was the first speaker system of industry standard that was installed in 1937.

 

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