In communications, the process of recovering the original information from a modulated signal wave. → modulation.
General: The modification of some property of a phenomenon by
another distinct phenomenon.
Verbal noun of → modulate.
modulation transfer function (MTF)
karyâ-ye tarâvaž-e degarâhangeš
Fr.: fonction de transfert de modulation
A measure of the ability of an optical system to reproduce (transfer) various levels of detail from the object to the image, as shown by the degree of contrast (modulation) in the image. → optical transfer function.
degarâhangeš-e fâz (#)
Fr.: modulation de phase
Modulation in which the phase angle of a sine-wave carrier is caused to depart from the carrier angle by an amount proportional to the instantaneous magnitude of the modulating wave.
rotational modulation (ROT)
Fr.: modulation rotationnelle
A very small variation in the surface brightness of a single star due to its rotation. Several types of stars are known to have photospheric spots. Brightness variation occurs as rotation carries star spots or other localized activity across the line of sight.