Boots – shoes – and leggings
Patent
1988-01-14
1990-01-23
Lall, Parshotam S.
Boots, shoes, and leggings
364486, 364481, 324 83D, 324 83R, 375118, G01R 2902
Patent
active
048962716
ABSTRACT:
Jitter in a clock signal is measured by using the clock signal to clock a digitizer repetitively digitizing a highly stable sine wave signal so as to produce a first data sequence representing the magnitiude of the sine wave signal as a function of time. This first data sequence is normalized to produce a second data sequence having data elements that vary between maximum and minimun magnitudes of +1 and -1. The arcsine of each element of the second data sequence is then determined to provide a monotonically increasing third data sequence, wherein each element of the third data sequence indicates a phase angle associated with a corresponding element of the second data sequence. A fourth data sequence is then generated, each element of the fourth data sequence representing a difference between a phase angle represented by a corresponding element of the third data sequence and a phase angle that the corresponding element of the third data sequence would represent if the clock signal had a constant frequency. The fourth data sequence provides a measure of clock signal jitter as a function of time.
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patent: 4777640 (1988-10-01), Turner et al.
Crosby Philip S.
Jenq Yih-Chyun
Bedell Daniel J.
Hulse Robert S.
Lall Parshotam S.
Tektronix Inc.
Trans V. N.
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