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Efficient combined harmonic transposition

  • US 9,881,597 B2
  • Filed: 10/14/2015
  • Issued: 01/30/2018
  • 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 analysis filter bank has a frequency resolution of Δ

    f;

    a first nonlinear processing unit configured to determine a first set of synthesis subband signals having a frequency resolution of FΔ

    f, with F being a resolution factor, with F≧

    1 from the set of analysis subband signals using a first transposition order P1;

    a second nonlinear processing unit configured to determine a second set of synthesis subband signals having the frequency resolution of FΔ

    f from the set of analysis subband signals using a second transposition order P2;

    wherein the second nonlinear processing unit is configured to determine at least one subband signal of the second set of synthesis subband signals by interpoling between two intermediate synthesis subband signals having a frequency resolution of P2Δ

    f;

    a combining unit configured to combine the first and the second set of synthesis subband signals;

    thereby yielding a combined set of synthesis subband signals; and

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

    wherein the synthesis filter bank has a frequency resolution of FΔ

    f.

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