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Efficient combined harmonic transposition

  • US 9,190,067 B2
  • Filed: 02/04/2015
  • Issued: 11/17/2015
  • Est. Priority Date: 05/27/2009
  • Status: Active Grant
First Claim
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1. A system configured to generate a high frequency component of a signal from a low frequency component of the signal, the system comprising:

  • an analysis filter bank configured to provide a set of analysis subband signals from the low frequency component of the signal;

    wherein the set of analysis subband signals comprises at least two analysis subband signals;

    wherein the analysis filter bank has a frequency resolution of Δ

    f;

    a nonlinear processing unit configured to determine a set of synthesis subband signals from the set of analysis subband signals;

    wherein the nonlinear processing unit is configured to determine an nth synthesis subband signal of the set of synthesis subband signals from a kth analysis subband signal and a (k+1)th analysis subband signal of the set of analysis subband signals; and

    a synthesis filter bank configured to generate the high frequency component of the signal based on the set of synthesis subband signals;

    wherein the synthesis filter bank has a frequency resolution of FΔ

    f;

    with F being a resolution factor, with F≧

    1;

    wherein the analysis filter bank and the synthesis filter bank are evenly stacked such that a center frequency of an analysis subband is given by kΔ

    f and a center frequency of a synthesis subband is given by nFΔ

    f;

    wherein the analysis filter bank, the nonlinear processing unit, or the synthesis filter bank are implemented at least in part in hardware;

    wherein the analysis filter bank has a number LA of analysis subbands, with LA >

    1, where k is an analysis subband index with k =0. . . LA

    1; and

    the synthesis filter bank has a number Ls of synthesis subbands, with Ls>

    0, where n is a synthesis subband index with n =0 Ls,−

    1.

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