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单词 jitter
释义
jitter

Statistics
  • A procedure for improving the display of bivariate data. If the variables are discrete, or if they are continuous, but the values have

    jitter

    Jitter. The axes in the diagrams represent the numbers of tips reported by two tipping-bucket rain-gauges in September 2000. The jittered scatter diagram illustrates the amounts of rain for the 813 two-minute periods for which at least one gauge reported a tip. The inner diagram shows the corresponding 34-point scatter diagram.

    been rounded, then some value pairs may occur very often, but would be represented by a single point on a normal scatter diagram. A better impression of the data can be obtained by adding small random quantities to all values before plotting.


Computer
  • The variations in the arrival time of a supposedly synchronous signal. Jitter may be caused by the fact that the original source of the signals has variations from its ideal periodic time, or by variations in the transit time from the signal source to the point at which the arrival times are actually observed, caused either by variations in the path length or in the speed at which the signal travels. In practice it is likely that all three effects contribute, and jitter is nearly always present.


Internet
  • What happens when a signal deviates from its basic features.


Electronics and Electrical Engineering
  • Short-term instabilities in either the amplitude or phase of a signal, particularly the signal on a cathode-ray tube. It has the effect of causing momentary displacements of the image on the screen, giving it a shaky or ‘jittery’ appearance. An oscilloscope that is used to measure the amount of jitter is termed a jitter scope. Momentary errors of synchronization between the scanner and receiver in television or facsimile transmission can cause jitter of the received images. This type of jitter is known as jitters.

    In hi-fi sound reproduction systems that use a digital recording method, jitter can cause unwanted audible variations in the pitch of the sound output. These can be quite unpleasant. In compact disc systems, for example, a noise similar to ignition interference is heard. Jitter in digital recording is the equivalent of wow and flutter in a system using analogue recording.


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