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Equalization (communications) In telecommunication, equalization is the reversal of distortion incurred by a signal transmitted through a channel. Equalizers are used to render the frequency response —for instance of a telephone line— flat from end-to-end. When a channel has been equalized the frequency domain attributes of the signal at ...
Equalization, or simply EQ, in sound recording and reproduction is the process of adjusting the volume of different frequency bands within an audio signal. The circuit or equipment used to achieve this is called an equalizer. [1][2] Most hi-fi equipment uses relatively simple filters to make bass and treble adjustments.
RIAA equalization is a form of pre-emphasis on recording and de-emphasis on playback. A recording is made with the low frequencies reduced and the high frequencies boosted, and on playback, the opposite occurs. The net result is a flat frequency response, but with attenuation of high-frequency noise such as hiss and clicks that arise from the ...
Apochromat. Chromatic aberration of a single lens causes different wavelengths of light to have differing focal lengths. An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses. The prefix apo- comes from the Greek ...
Diver clearing ears Section of the human ear, the Eustachian tube is shown in colour. Ear clearing, clearing the ears or equalization is any of various maneuvers to equalize the pressure in the middle ear with the outside pressure, by letting air enter along the Eustachian tubes, as this does not always happen automatically when the pressure in the middle ear is lower than the outside pressure.
The Sigma APO 150-500mm F5-6.3 DG OS HSM lens is a super-telephoto lens produced by Sigma Corporation. It contains three SLD (Special Low Dispersion) glass elements to provide correction for chromatic aberration. It is aimed toward advanced consumer level photographers, and is available in Nikon, Canon, Pentax and Sigma camera mounts.
An all-pass filter is a signal processing filter that passes all frequencies equally in gain, but changes the phase relationship among various frequencies. Most types of filter reduce the amplitude (i.e. the magnitude) of the signal applied to it for some values of frequency, whereas the all-pass filter allows all frequencies through without changes in level.
Certain medications should not be taken with magnesium, including certain antibiotics, PPI drugs, diuretics, bisphosphonates, and high doses of zinc. If you take any of these medications and might ...