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A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...
Mel Baggs (born Amanda Melissa Baggs; August 15, 1980 – April 11, 2020), was an American non-binary blogger who predominantly wrote on the subject of autism and disability. At times, Baggs used a communication device to speak and referred to themself as a low-functioning autistic. Revelations about Baggs's past created some uncertainty about ...
A number of companies make combination preamplifier-DI units for electric bass, double bass, or for acoustic instruments which use piezoelectric pickups (e.g., a violin, acoustic guitar, mandolin, etc.). These units may be housed in a "stompbox" pedal format, in a small rackmount unit (often less than a full rack space), or in units designed to ...
Sources: [1] [3] Second-order Linkwitz–Riley crossovers (LR2) have a 12 dB/octave (40 dB/decade) slope.They can be realized by cascading two one-pole filters or using a Sallen Key filter topology with a Q 0 value of 0.5.
A440 Play ⓘ. 440 Hz = 4.21 or 4.39. The Bark scale is a psychoacoustical scale proposed by Eberhard Zwicker in 1961. It is named after Heinrich Barkhausen, who proposed the first subjective measurements of loudness. [1]
Rayleigh scattering-based distributed acoustic sensing (DAS) systems use fiber optic cables to provide distributed strain sensing. In DAS, the optical fiber cable becomes the sensing element and measurements are made, and in part processed, using an attached optoelectronic device .
The title track was written by Milt "Bags" Jackson and the three compositions written by the young Sonny Rollins all went on to become jazz standards.On "Oleo", Davis uses a Harmon mute to obtain a unique timbre, one that would become an iconic aspect of his sound.
The Railsback curve shows how a piano tuned to compensate for inharmonicity deviates from theoretically correct equal-tempered tuning. The Railsback curve, first measured in the 1930s by O.L. Railsback, a US college physics teacher, expresses the difference between inharmonicity-aware stretched piano tuning, and theoretically correct equal-tempered tuning in which the frequencies of successive ...
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