Boots – shoes – and leggings
Patent
1987-10-30
1990-02-06
Arnold, Bruce Y.
Boots, shoes, and leggings
324 77G, 324 78F, 356 27, 377 21, G06G 719, G01R 2302
Patent
active
048992895
ABSTRACT:
The occurrence and frequency of a periodic component embedded in a composite waveform including noise is detected by real time calculating the autocorrelation function of the waveform and deducing the frequency of the periodic component from the value of the autocorrelation function coefficients. An analog-to-digital converter periodically transforms the waveform into samples having q bits. The samples are delayed by a predetermined time interval .DELTA.t and multiples thereof, to derive 2n delayed samples, x.sub.i, x.sub.i-1 . . . x.sub.i-2n. The delayed samples are multipled to derive 2n products, such that the first n products are represented by x.sub.1 .multidot.x.sub.i-k and the second n products are represented by x.sub.1-n .multidot.x.sub.i-(n+k), where k is selectively 1 . . . n. Difference between the first and second products are obtained as (P.sub.1 -P.sub.n+1) . . . (P.sub.n-1 -P.sub.2n), where P.sub.1 =x.sub.i .multidot.x.sub.i-1, P.sub.n-1 =x.sub.i .multidot.x.sub.i-n, P.sub.+1 =x.sub.i-n .multidot.x.sub.i- n+1, P.sub.2n =x.sub.i-n .multidot.x.sub.i-2n. The differences are integrated to derive autocorrelation funtion coefficients of the input signal. In response to at least one of the coefficients exceeding a predetermined threshold, an indication that the input signal contains a periodic component is derived.
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patent: 3646333 (1972-02-01), Pryor, Jr.
patent: 4403184 (1983-09-01), Witt et al.
patent: 4786168 (1988-11-01), Meyers et al.
ICIASF '85 RECORD: "Fast Digital Data Acquisition and Analysis of LDA Signals by Means of a Transfer Recorder and an Array Processor", by D. Pallek et al, pp. 309-312.
Third Int'l. Symposium of Appl. of Laser Anemometry to Fluid Mechanic: "Frequency Domain Laser Velocimeter Signal Processor", by F. Mayers et al, 3.6, pp. 1-6.
Arnold Bruce Y.
Callaghan Terry S.
Office National d'Etudes et de Recherche Aerospatiales
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