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Digital filter system

  • US 5,856,934 A
  • Filed: 03/27/1997
  • Issued: 01/05/1999
  • Est. Priority Date: 08/30/1996
  • Status: Expired due to Term
First Claim
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1. A digital filter system which can vary at least one of position and width of a pass band thereof, comprising:

  • a digital filter for filtering an input digital signal in accordance with filter coefficients {ak1, ak2, b00, bk1, bk2, c and d} (k=1, 2, . . . , N/2;

    N is an even number), and for outputting the filtered signal;

    calculation means for calculating each of the filter coefficients {ak1, ak2, b00, bk1, bk2, c and d} in accordance with equations (48) to (54) by using pass band position data x and pass band width data y; and

    setting means for setting the filter coefficients calculated by said calculation means to said digital filter;

    ##EQU13## "L" and "M" are the orders for the approximation, and Pb00i, Qb00j, Pbk1i, Qbk1j, Pbk2i, Qbk2j, Pak1i, Qak1j, Pak2i, Qak2j, Pci, Qcj, Pdi and Qdj are constants.

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