Method and means for measuring the frequency of a

专利名称：Method and means for measuring the

frequency of a periodic signal

发明人：Jean-Louis Lescourret申请号：US07/246852申请日：19880920公开号：US04866260A公开日：19890912

摘要：Frequency measurement involves anti-foldover filtering (1) of an analog signalwhose frequency i.e. to be measured, followed by sampling of the filtered analog signaland analog-digital conversion of the samples, then digital band-pass filtering (3) on aslaved basis. Associated calculation (4-7) utilizes a linear regression having a singlecoefficient a for the linear relation between successive digitized samples (2) and toestimate the coefficient a for approximation of the frequency to be measured. Theinvention is particularly applicable to signals from a probe having nuclear magneticresonance used in measuring intensity of the terrestrial magnetic field disturbed bymetallic masses.

申请人：CROUZET (SOCIETE ANONYME FRANCAISE)

代理机构：Lowe, Price, LeBlanc, Becker & Shur

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