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Method and apparatus for encoding a wideband speech signal utilizing downmixing of a highband component

  • US 9,070,361 B2
  • Filed: 06/10/2011
  • Issued: 06/30/2015
  • Est. Priority Date: 06/10/2011
  • Status: Active Grant
First Claim
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1. A method for encoding a signal, the method comprising:

  • receiving a wideband speech signal at a filter bank;

    filtering the wideband signal to produce a lowband signal and a highband signal;

    encoding the lowband signal with a first encoder; and

    encoding the highband signal with a second encoder;

    whereinthe step of filtering the wideband signal to produce the highband signal comprises;

    preprocessing the wideband signal to produce a preprocessed signal; and

    performing a downmixing operation on the preprocessed signal, the downmixing operation includingperforming a Hilbert Transform on the preprocessed signal to produce two quadrature versions, real and imaginary, of the preprocessed signal;

    mixing the two quadrature versions, real and imaginary, of the preprocessed signal with a cosine and a sine function, respectively, to produce mixed signals; and

    adding the mixed signals together.

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