Signal processing method, data processing method and device

Signal processing method, data processing method and device

  • CN 101,930,425 B
  • Filed: 06/24/2009
  • Issued: 09/30/2015
  • Est. Priority Date: 06/24/2009
  • Status: Active Grant
First Claim
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1. time domain is to a signal processing method for frequency domain, is applied to broadband or ultra-broadband digital audio coding, it is characterized in that, comprising:

  • Store the data form of a N/4 point;

    Pre-service is carried out to time domain data;

    Described time domain data is time domain audio data;

    Use twiddle factor pre-rotation process is carried out to the data that described pre-service obtains;

    Described twiddle factor comprise the data in the data form of described N/4 point;

    Data after described pre-rotation process are carried out to the discrete Fourier transformation of N/4 point;

    Use twiddle factor rotation processing is carried out to the data after described discrete Fourier transformation, obtains frequency domain data;

    Described twiddle factor comprise the data in the data form of described N/4 point;

    Described a, b are constant, and described N is time domain data length, described in described frequency domain data is frequency domain audio data, wherein, and n=0 ..., N/4-1, k=0 ..., N/4-1.

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