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Method and apparatus to encode and decode an audio/speech signal

  • US 9,355,646 B2
  • Filed: 09/06/2013
  • Issued: 05/31/2016
  • Est. Priority Date: 07/14/2008
  • Status: Active Grant
First Claim
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1. An apparatus for decoding an audio or speech signal, the apparatus comprising:

  • a determination unit configured to receive a signal in a bitstream as an input and determine whether the signal is encoded in a frequency domain or a time domain based on encoding information included in the bitstream;

    a frequency domain decoding unit configured to loss-less decode and dequantize the signal when it is determined that the signal is encoded in the frequency domain;

    a temporal noise shaping unit configured to perform a temporal noise shaping on the dequantized signal;

    an inverse transform unit configured to inverse-transform the temporal noise shaped signal to a time domain signal;

    a time domain decoding unit configured to reconstruct the signal by using a linear prediction based decoding when it is determined that the signal is encoded in the time domain; and

    a high frequency generating unit configured to generate a high band signal using either the inverse-transformed signal or the reconstructed signal and output the high band signal.

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