Method and means for measuring the frequency of a periodic signal
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United States of America Patent
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Sep 12, 1989
Grant Date -
N/A
app pub date -
Sep 20, 1988
filing date -
Sep 21, 1987
priority date (Note) -
Expired
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Abstract
Frequency measurement involves anti-foldover filtering (1) of an analog signal whose frequency i.e. to be measured, followed by sampling of the filtered analog signal and analog-digital conversion of the samples, then digital band-pass filtering (3) on a slaved basis. Associated calculation (4-7) utilizes a linear regression having a single coefficient a for the linear relation between successive digitized samples (2) and to estimate the coefficient a for approximation of the frequency to be measured. The invention is particularly applicable to signals from a probe having nuclear magnetic resonance used in measuring intensity of the terrestrial magnetic field disturbed by metallic masses.
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