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Aliasing reduction using complex-exponential modulated filterbanks

  • US 20030016772A1
  • Filed: 04/02/2002
  • Published: 01/23/2003
  • Est. Priority Date: 04/02/2001
  • Status: Active Grant
First Claim
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1. A method for estimation of energy measures of coefficients or subband signals obtained from a digital filterbank, characterized by:

  • optimizing a symmetric low-pass prototype filter p0(n), having filter order N, not constrained to have the perfect reconstruction property;

    building an M-channel analysis filterbank by complex-exponential modulation of said prototype filter;

    where said filterbank has filter coefficients as hk

    (n)
    =p0

    (n)


    exp

    {



    π

    2

    M


    (2

    k
    +1
    )


    (n-N2)
    }
    ,


    and n=0, 1, . . . , N, and k=0,1, . . . , M−

    1;

    filtering a real-valued time domain signal through said filterbank; and

    calculating the squared absolute values of the complex-valued subband signals obtained from said filtering.

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