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2. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   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 ...

3. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   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.

4. List of Bose headphones - Wikipedia

   en.wikipedia.org/wiki/List_of_Bose_headphones

   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.

5. List of amateur radio modes - Wikipedia

   en.wikipedia.org/wiki/List_of_amateur_radio_modes

   Amateur teleprinting over radio (AMTOR) D-STAR (Digital Data) a high speed (128 kbit/s), data-only mode. Hellschreiber, also referred to as either Feld-Hell, or Hell a facsimile-based teleprinter. Discrete multi-tone modulation modes such as Multi Tone 63 (MT63) Multiple frequency-shift keying (MFSK) modes such as. FSK441, JT6M, JT65, and FT8.

6. Squelch - Wikipedia

   en.wikipedia.org/wiki/Squelch

   A noise squelch circuit is noise-operated and can be used in AM or FM receivers, and relies on the receiver quieting in the presence of an AM or FM carrier. To minimize the effects of voice audio on squelch operation, the audio from the receiver's detector is passed through a high-pass filter , typically passing 4,000 Hz (4kHz) and above ...

7. List of speakers of the United States House of Representatives

   en.wikipedia.org/wiki/List_of_speakers_of_the...

   Official seal of the Speaker of the United States House of Representatives. Sam Rayburn, longest serving speaker of the House, 17 years, 53 days (cumulative) Tip O'Neill, longest uninterrupted tenure of office, 9 years, 350 days. Theodore M. Pomeroy, shortest tenure of office, 1 day. Rank.

8. Adaptive noise cancelling - Wikipedia

   en.wikipedia.org/wiki/Adaptive_noise_cancelling

   Adaptive noise cancelling. Adaptive noise cancelling is a signal processing technique that is highly effective in suppressing additive interference or noise corrupting a received target signal at the main or primary sensor in certain common situations where the interference is known and is accessible but unavoidable and where the target signal ...

9. Who is Mike Johnson, the new speaker of the House? - AOL

   www.aol.com/news/mike-johnson-speaker-house...

   A firefighter’s son and a culture warrior. Johnson, 51, grew up the son of a firefighter in Shreveport, La. Since 2017, he has represented a congressional district of 761,000 people that ...