A loudspeaker, commonly called a speaker, is an electroacoustic device that converts an electrical audio signal into sound, typically by using a voice coil that moves within a magnetic field to vibrate a diaphragm or cone. Working essentially as the reverse of a microphone, the modern moving-coil dynamic loudspeaker was invented in 1925 by Chester W. Rice and Edward W. Kellogg, whose key innovation was tuning the device mechanical parameters to give it a comparatively flat frequency response, distinguishing their design from earlier, less successful attempts at loudspeaker design.
Facts
Patent or First-Use DateSourced to the subject's own account YearSourced to the subject's own account SignificanceSourced to the subject's own accountFirst practical device to convert an electrical signal back into audible sound, the technology underlying telephones, radio, recorded music and public address systems. 1 FAQs
What made the 1925 moving-coil loudspeaker different from earlier loudspeakers?
Rice and Kellogg tuned the mechanical parameters of a moving-coil design to give a reasonably flat frequency response.
Alexander Graham Bell patented his first electric loudspeaker in 1876 as part of his telephone. It was a moving-iron type capable of reproducing intelligible speech. The moving-coil principle used in most speakers today was patented in 1925 by Edward W. Kellogg and Chester W. Rice. The key difference between earlier attempts and the Rice and Kellogg patent was the adjustment of mechanical parameters to give a reasonably flat frequency response. In their design, current from the audio signal passes through a voice coil that moves in a magnetic field, and the coil is attached to a diaphragm or cone that makes sound waves in the air.
Connections
Associated With
Loudspeakers are core acoustical transducers
In Field
Source Loudspeaker (Wikipedia)
Invented By
Source Loudspeaker (Wikipedia)
Sources
1. Loudspeaker (Wikipedia)
WikipediaHistory section, opening sentence (year clause), Wikipedia article Loudspeaker
Alexander Graham Bell patented his first electric loudspeaker (a moving iron type capable of reproducing intelligible speech) as part of his telephone in 1876, which was followed in 1877 by an improved version from Ernst Siemens.
opening definition section, Wikipedia article Loudspeaker
The speaker driver is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound.
History section, opening sentence (patent clause), Wikipedia article Loudspeaker
Alexander Graham Bell patented his first electric loudspeaker (a moving iron type capable of reproducing intelligible speech) as part of his telephone in 1876, which was followed in 1877 by an improved version from Ernst Siemens.
In Field: Electrical Engineering, Lead section
A loudspeaker (commonly referred to as a speaker or, more fully, a speaker system) is a combination of one or more speaker drivers, an enclosure, and electrical connections (possibly including a crossover network).
Invented By: Alexander Graham Bell, Article body
Alexander Graham Bell patented his first electric loudspeaker (a moving iron type capable of reproducing intelligible speech) as part of his telephone in 1876, which was followed in 1877 by an improved version from Ernst Siemens.
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