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Jitter.
First Day Jitters by Julie Danneberg
First Day Jitters by Julie Danneberg
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Jitter
In telecommunication, jitter is an abrupt and unwanted variation of one or more signal characteristics, such as the interval between successive pulses, the amplitude of successive cycles, or the frequency or phase of successive cycles.
Jitter may be specified in qualitative terms (e.g. amplitude, phase, pulse width or pulse position), or quantitative terms (e.g. mean, RMS, or peak-to-peak displacement).
The low-frequency cutoff for jitter is usually specified at 1 Hz.
For clock jitter, there are two main parameters: period jitter
and cycle to cycle jitter
Period jitter consists of peak to peak period jitter and RMS
period jitter. The peak to peak period jitter is the difference
between the maximum and minimum period of the clock
signal. The RMS period jitter is the standard deviation of the peak
to peak period jitter.
Cycle to cycle jitter is the variation from one period to the next
adjacent period of the signal. In order to determine the variation
between adjacent periods, all consecutive periods need to be
measured. The peak to peak period jitter is the worst case of cycle
to cycle jitter.
See also:
Source: Federal Standard 1037C and MIL-STD-188
Jitter is also the name of a set of video processing and matrix manipulation extensions to Max/MSP.
The above article is adapted from from Wikipedia All Wikipedia article text is available under the terms of the GNU Free Documentation License
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