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In physics, acoustics, and telecommunications, a harmonic is a sinusoidal wave with a frequency that is a positive integer multiple of the fundamental frequency of a periodic signal. The fundamental frequency is also called the 1st harmonic; the other harmonics are known as higher harmonics.
The harmonic electromagnetic forces responsible for magnetic noise and vibrations in a healthy machine can come from Pulse-width modulation supply of the machine [25] slotting effects [26] [27] [28] magnetic saturation [29] In a faulty machine, additional noise and vibrations due to electromagnetic forces can come from
The whirly tube, corrugaphone, or bloogle resonator, also sold as Free-Ka in the 1960s-1970s, is an experimental musical instrument which consists of a corrugated (ribbed) plastic tube or hose (hollow flexible cylinder), open at both ends and possibly wider at one end (), the thinner of which is rotated in a circle to play.
A harmonic is any member of the harmonic series, an ideal set of frequencies that are positive integer multiples of a common fundamental frequency. The fundamental is a harmonic because it is one times itself. A harmonic partial is any real partial component of a complex tone that matches (or nearly matches) an ideal harmonic. [3]
A LectroFan white noise machine A clock radio that includes a white noise machine. A white noise machine is a device that produces a noise that calms the listener [citation needed], which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds.
Acoustic telegraphy devices were electromechanical and made musical or buzzing or humming sound waves in air for a few feet. But the primary function of these devices was not to generate sound waves, but rather to generate alternating electrical currents at selected audio frequencies in wires which transmitted telegraphic messages electrically ...
Comparing harmonic (top) and inharmonic (bottom) waveforms. Percussion bars, such as xylophone, are hung at ≈2/9 and ≈7/9 length, and struck at 1/2 length, to reduce inharmonicity. In music, inharmonicity is the degree to which the frequencies of overtones (also known as partials or partial tones ) depart from whole multiples of the ...
For instance, its sound output came in the form of connecting ordinary telephone receivers to large paper cones—a primitive form of loudspeaker. Cahill stated that electromagnetic diaphragms were the most preferable means of outputting its distinctive sound. There are no known recordings of its music.