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The first headphones were developed in the late 19th century for use by switchboard operators, to keep their hands free. Initially, the audio quality was mediocre and a step forward was the invention of high fidelity headphones. [3] [4] Headphones exhibit a range of different audio reproduction quality capabilities.
The history of sound recording - which has progressed in waves, driven by the invention and commercial introduction of new technologies — can be roughly divided into four main periods: The Acoustic era (1877–1925) The Electrical era (1925–1945) The Magnetic era (1945–1975) The Digital era (1975–present)
In the 1920s in Berlin, founder Eugen Beyer believed that cinema presented a new opportunity in communication media. The first products he produced were loudspeakers for film palaces in 1924. [3] At the end of the 1930s, Beyer developed the first pair of dynamic headphones , the DT 48.
History of hearing aids. Madame de Meuron with ear trumpet. The first hearing aid was created in the 17th century. The movement toward modern hearing aids began with the creation of the telephone, and the first electric hearing aid was created in 1898. By the late 20th century, the digital hearing aid was distributed to the public commercially.
Nathaniel Baldwin. Nathaniel Baldwin (December 1, 1878 – January 19, 1961) [1] was an American inventor and industrialist, [2] known for his improved telephonic earphone, among other inventions. He was also a supporter of the early Mormon fundamentalist movement.
Dictaphone. Dictaphone was an American company founded by Alexander Graham Bell that produced dictation machines. It is now a division of Nuance Communications, based in Burlington, Massachusetts . Although the name "Dictaphone" is a trademark, it has become genericized as a means to refer to any dictation machine .
History of radio. The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of ...
The Golden Age of Radio, also known as the old-time radio ( OTR) era, was an era of radio in the United States where it was the dominant electronic home entertainment medium. It began with the birth of commercial radio broadcasting in the early 1920s and lasted through the 1950s, when television gradually superseded radio as the medium of ...