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The "QuietComfort 20" (QC20) and QC20i in-ear headphones were released in 2015 and are the company's first in-ear noise cancelling headphones. [19] It received a 2014 Red Dot Design Award. [20] Also, it received a CNET 's Editors' Choice Award of 4.5/5 points for its active noise-cancelling. [21]
In 1987, Amar Bose and William Short won the Inventor of the Year award from Intellectual Property Owners for the waveguide loudspeaker system. A model with a CD player was added in 1992. The "Acoustic Wave Music System II" was released in 2006 and added MP3 CD playback, a "Boselink" port and a headphone jack. This system was judged to be ...
QuietComfort 15. The "QuietComfort 15" (QC15) over-ear headphones were sold from 2009 until 2015. [32] Compared with its predecessor, the QuietComfort 2, the QC15 had microphones on the inside and outside of each unit and revised foam padding. Like the QuietComfort 2, the QC15 was powered by a single AAA-sized battery.
Beats Studio Pro – Wireless Bluetooth Noise Cancelling Headphones – Personalized Spatial Audio, USB-C Lossless Audio, Apple & Android Compatibility, Up to 40 Hours Battery Life – Black ...
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Crystal radios are the simplest type of radio receiver [2] and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of wire, a capacitor, a crystal detector, and earphones (because a crystal set has insufficient power for a loudspeaker ). [3]
The "asymmetric conduction" of electric current across electrical contacts between a crystal and a metal was discovered in 1874 by Karl Ferdinand Braun. [6] Crystals were first used as radio wave detectors in 1894 by Jagadish Chandra Bose in his microwave experiments. [7] [8] Bose first patented a crystal detector in 1901. [9]
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