Below the age of 20, acne can cause dark spots due to scarring and red marks left by the infection. Skin Diseases That Cause Dark Spots Melasma: Itâs one of the commonest causes of grayish patches on the face. It mostly affects the forehead, cheeks, or the area between your mouth and nose.
The definition of a titter is a nervous and half-hidden laugh. An example of a titter is the laugh made by a schoolgirl in class. verb. To titter means to laugh or giggle in a somewhat suppressed way. An example of to titter is the laugh of a nervous toddler.
Jitter period is the interval between two times of maximum effect (or minimum effect) of a signal characteristic that varies regularly with time. Jitter frequency, the more commonly quoted figure, is its inverse.bsolute jitter is the absolute difference in the position of a clock's edge from where it would ideally be. Period jitter (aka cycle jitter) is the difference between any one clock period and the ideal/average clock period.