Boots – shoes – and leggings
Patent
1984-10-25
1987-10-27
Gruber, Felix D.
Boots, shoes, and leggings
324 83D, 307525, G01R 2508, H03D 1300
Patent
active
047034483
ABSTRACT:
A method for measuring channel-to-channel skew or phase difference in an electronic system of the type having a plurality of input channels which are sampled by sampling pulses having a frequency f.sub.o and a period P.sub.o. The sampling pulses at each input channel are first mixed with a reference signal having a frequency f.sub.r and a period P.sub.r that differ from the frequency and period of the sampling pulses. The mixing produces a beat signal at each input channel. A quantity termed "effective measurement interval" which is equal to the difference of the periods of the sampling pulses, P.sub.o, and the reference signal, P.sub.r, is computed. A quantity termed "apparent skew" which is equal to the number of periods P.sub.o of the sampling pulses which represents the skew or phase difference between the beat signals is also determined. Finally, skew or phase difference of the sampling pulses is computed by multiplying the "effective measurement interval" by the "apparent skew".
REFERENCES:
patent: 3575663 (1971-04-01), McIntosh
patent: 3681693 (1972-08-01), Hsueh
patent: 3764903 (1973-10-01), Griswold
patent: 4206414 (1980-06-01), Chapman
Gruber Felix D.
Nicolet Instrument Corporation
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