Audio decoding apparatus and audio decoding method

Audio decoding apparatus and audio decoding method

  • CN 1,585,972 A
  • Filed: 07/30/2003
  • Published: 02/23/2005
  • Est. Priority Date: 08/01/2002
  • Status: Active Application
First Claim
Patent Images

1. one kind is used for from the audio decoding apparatus of bit stream decoded audio signal, wherein:

  • Described bit stream comprises the coded message and the additional information that is used for narrow band signal is expanded to broadband signal about narrowband audio signal,Described additional information comprises the high-frequency component information of feature of the expression frequency band higher than the frequency band of coded message and the sine wave that the sinusoidal signal of a special frequency band is added in expression to adds information,Described audio decoding apparatus comprises;

    Be used for decomposing the bit stream demultiplexer of coded message and additional information from the bit stream multichannel;

    Be used for from the decoding device of the coded message decoding narrowband audio signal of multichannel decomposition;

    Be used for narrowband audio signal is separated into the decomposition sub-filter of multichannel first subband signal;

    High frequency signal generator, it is used to produce multichannel second subband signal, and multichannel second subband signal is recently in the higher frequency band of the frequency band of the high-frequency component information of the coded message of at least one first subband signal and the additional information of decomposing from multichannel;

    The sinusoidal signal adding set, its sine wave according to the additional information of decomposing from multichannel adds information, is used for sinusoidal signal is added to a particular sub-band of multichannel second subband signal;

    Compensating signal generator, it produces the alias component signal that produces near the former thereby subband particular sub-band that is used to suppress owing to the interpolation sinusoidal signal according to the phase propetry and the amplitude characteristic of sinusoidal signal;

    AndReal-valued calculation synthon band filter, it is used for multichannel first subband signal and multichannel second subband signal are merged so that obtain wideband audio signal.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×