Search results
Results From The WOW.Com Content Network
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.
Many pioneering attempts to record and reproduce sound were made during the latter half of the 19th century – notably Édouard-Léon Scott de Martinville 's phonautograph of 1857 – and these efforts culminated in the invention of the phonograph by Thomas Edison in 1877. Digital recording emerged in the late 20th century and has since ...
The first products he produced were loudspeakers for film palaces in 1924. At the end of the 1930s, Beyer developed the first pair of dynamic headphones, the DT 48. World War II temporarily froze production; however, in 1948, Beyerdynamic sought new beginnings in Heilbronn. The "Stielhörer" DT 49 became a popular item of "Plattenbars" (record ...
The Acousticon's Model 56 was created in the mid-1920s and was one of the first portable hearing aid units, although it was quite heavy. [1] The first wearable hearing aid using vacuum tube technology went on sale in England in 1936, and a year later in the United States. [5] By the 1930s, hearing aids were becoming popular to the public. [3]
First National Part-Talkie Extant Homecoming [F 34] February 16, 1929 UFA / Paramount Synchronized Score Extant The Redeeming Sin: February 16, 1929 Warner Bros. Part-Talkie Audio-only [Discs 1-2, 4-5, 7] Making the Grade: February 17, 1929 Fox Film Corporation Part-Talkie Lost The Royal Rider: February 17, 1929 First National Synchronized ...
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the birth of commercial radio broadcasting in the early 1920s and lasted through the 1950s, when television gradually superseded radio as the medium of ...
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 ...
Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. Tivadar Puskás proposed the telephone switchboard exchange in 1876. Thomas Edison invented the carbon microphone which produced a strong telephone ...