Writer, Anonymous (October 1934). The Telephone Problem in the World's Largest Metropolitan Area: A Summary of Past and Present. p.248. Upper right image: A New York City central office in the '80s, showing " beehive" as well as early desk type switchboards, and both young women and boy operators [Note image of telephone operator's with head-mounted telephone receivers] {{ cite book}}: |work= ignored ( help) Nowadays, there are many ways to listen to music with friends online. But what about 100+ years ago, before even the radio was invented? Enter the Electrophone.

of headphones and the beginnings of portable sound The history of headphones and the beginnings of portable sound

The origin of headphones can be traced to Alexander Graham Bell's invention of the telephone in 1876, which brought sound to the listener's ear via electrical signals. In 1910 this technology took the form of a headband headset, and in 1958, it evolved into audio headphones for listening to stereo records. No matter which type of headphones you use (wired, USB, or Bluetooth), they all follow the same principles of producing a sound. If the audio originates on a digital device, that digital signal needs to be converted into a raw electric current by a Digital Analog Converter (DAC). John Koss wasn’t only innovative in his creation of the first stereo headphones. He also made significant advancements in marketing. The Beatlephones released in 1966 were branded headphones with a partnership between Koss and The Beatles. Reducing noise hazards for call and dispatch center operators". 2018-12-19. doi: 10.26616/NIOSHPUB2011210. {{ cite journal}}: Cite journal requires |journal= ( help)Joel, Amos E. (1975). A History of Engineering and Science in the Bell System: The early years (1875-1925). The Laboratories. ISBN 9780608080666. The sensitivity of headphones is usually between about 80 and 125dB/mW and usually measured at 1kHz. [37] Specifications

Headphones: How Far the Audio Industry Has Come History of Headphones: How Far the Audio Industry Has Come

Not realizing the huge potential, Baldwin invented the first headphones in his kitchen in Utah as a device to help him hear the sermons at his local Mormon temple.Over the past 20 years, various Bluetooth versions and upgrades have been released, allowing users to connect to their music wirelessly. 2008: Beats by Dre A pair of Beats by Dre headphones. (From: beatsbydre.com) Electrostatic headphones require a voltage source generating 100V to over 1kV, and are on the user's head. Since the invention of insulators, there is no actual danger. They do not need to deliver significant electric current, which further limits the electrical hazard to the wearer in case of fault.