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Most modern rechargeable electric toothbrushes from brands such as Sonicare, FOREO, and Oral-B fall into this category and typically have frequencies that range from 200 to 400 Hz, that is 12,000–24,000 oscillations or 24,000–48,000 movements per minute.
The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz (10,200 to 21,000 movements per minute), and that of a typical adult female from 165 to 255 Hz (19,800 to 30,600 movements per minute). [2] [3] Ultrasonic toothbrushes work by generating an ultrasonic wave usually from an implanted piezo crystal, the ...
Oral-B toothbrushes and floss. Oral-B is an American brand of oral hygiene products, including toothpastes, toothbrushes, electric toothbrushes, and mouthwashes. The brand has been in business since the invention of the Hutson toothbrush in 1950 and in Redwood City, California. [1] [2] [3] [4]
Crystal oscillators can be manufactured for oscillation over a wide range of frequencies, from a few kilohertz up to several hundred megahertz.Many applications call for a crystal oscillator frequency conveniently related to some other desired frequency, so hundreds of standard crystal frequencies are made in large quantities and stocked by electronics distributors.
A pendulum with a period of 2.8 s and a frequency of 0.36 Hz. For cyclical phenomena such as oscillations, waves, or for examples of simple harmonic motion, the term frequency is defined as the number of cycles or repetitions per unit of time.
With driven cyclostationary systems that have a stable time reference, the correlation in frequency is a series of impulse functions separated by f o = 1/T. Thus, noise at f 1 is correlated with f 2 if f 2 = f 1 + kf o, where k is an integer, and not otherwise. However, the phase produced by oscillators that exhibit phase noise is not stable.