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Non-phase shifting bidimensional filter

  • US 7,152,085 B2
  • Filed: 10/18/2002
  • Issued: 12/19/2006
  • Est. Priority Date: 10/19/2001
  • Status: Active Grant
First Claim
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1. A band-pass filter in the frequency domain with at least one pass band, which is real, bidimensional, oriented along a phase axis and resulting from the product of two identical one-dimensional Hamming windows, a transfer function of each of these windows being:

  • X i

    ( f )
    = α

    i
    + ( 1 - α

    i
    )


    cos

    π



    ( f - f



    q i
    )
    f0 i
    ,
    where;

    f is a current frequency;

    α

    i is a real number, included between and excluding 0 and 1;

    fqi is a central frequency of the passband; and

    f0i defines half of the passband centered on fqi.

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