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Noise canceling apparatus for weight measurement, and noise canceling method for weight measurement

  • US 20030215100A1
  • Filed: 05/13/2003
  • Published: 11/20/2003
  • Est. Priority Date: 05/17/2002
  • Status: Active Grant
First Claim
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1. A noise canceling apparatus for weight measurement for eliminating a fixed-period vibration noise contained in a quantitative signal, said quantitative signal being a result of digitization of a signal obtained by detecting a weight of an object to be measured, said apparatus comprising:

  • a band pass filter for filtering a frequency component of said quantitative signal at a plurality of notches, said filtering using variable filter coefficients; and

    a coefficient control section for calculating a series of said filter coefficients, and supplying said series to said band pass filter, wherein said band pass filter has a frequency characteristic including said plurality of notches, and a transfer function of said band pass filter includes a product of a plurality of factors each having a root corresponding to each one of said plurality of notches, said coefficient control section comprising;

    a frequency changing element for changing a frequency component of a root as a part of a factor, said root corresponding to a notch selected from said plurality of notches;

    an expansion element for expanding a product of a plurality of factors in a polynomial, said product constituting said transfer function of said band pas filter; and

    a coefficient calculating element for calculating a series of said filter coefficients on the basis of said polynomial.

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