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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 ...
Sliding mode control. In control systems, sliding mode control ( SMC) is a nonlinear control method that alters the dynamics of a nonlinear system by applying a discontinuous control signal (or more rigorously, a set-valued control signal) that forces the system to "slide" along a cross-section of the system's normal behavior.
A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.
August 6, 2024 at 3:43 PM. There are small signs of improvement in the mental health of U.S. teenagers, a government survey released Tuesday said, but the share of students — particularly girls ...
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A Course in Miracles (also referred to as ACIM or the Course) is a 1976 book by Helen Schucman. The underlying premise is that the greatest "miracle" is the act of simply gaining a full "awareness of love's presence" in a person's life. [1] Schucman said that the book had been dictated to her, word for word, via a process of "inner dictation ...
J.R. Reed’s three kids were scattered in different states across the country this week. They all had tickets to get home — on Delta.
Octoechos. Oktōēchos (here transcribed "Octoechos"; Greek: ὁ Ὀκτώηχος Greek pronunciation: [okˈtóixos]; [ 1] from ὀκτώ "eight" and ἦχος "sound, mode" called echos; Slavonic: Осмогласие, Osmoglasie from о́смь "eight" and гласъ, Glagolitic: ⰳⰾⰰⱄⱏ, "voice, sound") is the eight-mode system used ...
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