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 Connections
Associated With
Loudspeakers are core acoustical transducers
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.
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