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Bob Heil. Robert Gene Heil (October 5, 1940 – February 28, 2024) was an American sound and radio engineer who created the template for modern rock sound systems. He founded the company Heil Sound in 1966 [ 1] and built touring sound systems for bands such as The Grateful Dead and The Who. [ 2] He was also a musician, and played the Wurlizter ...
The Amateur radio R-S-T system signal report format currently in use was first developed in 1934. [citation needed] As early as 1943, the U.S and UK military published the first guidance that included the modern "Weak but readable", "Strong but distorted", and "Loud and clear" phrases. [citation needed]
Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...
Soundproofing is any means of impeding sound propagation.There are several basic ways to reduce sound: increasing the distance between source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using active antinoise sound generators.
Radio noise. In radio reception, radio noise (commonly referred to as radio static) is unwanted random radio frequency electrical signals, fluctuating voltages, always present in a radio receiver in addition to the desired radio signal. Radio noise near in frequency to the radio signal being received (in the receiver's passband) interferes with ...
The sudden absence of background noise gives the near-end user the impression that the line has gone dead. In response to this, Bell Labs developed echo canceler theory in the early 1960s, [ 4 ] [ 5 ] which then resulted in laboratory echo cancelers in the late 1960s and commercial echo cancelers in the 1980s. [ 6 ]
Website. www .bose .com. Bose Corporation ( / boʊz / ⓘ) is an American manufacturing company that predominantly sells audio equipment. The company was established by Amar Bose in 1964 and is based in Framingham, Massachusetts. It is best known for its home audio systems and speakers, noise-canceling headphones, professional audio products ...
QuietComfort 20. 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.
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