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FAAC and FAAD2-based single track constant bit rate audio realtime coding and decoding error correcting method

A technology of fixed bit rate and error correction method, applied in speech analysis, error prevention, instruments, etc., can solve the problems of complex transmission control mechanism, poor robustness, and increased system resources, so as to achieve no increase in system resources and robustness. high effect

Inactive Publication Date: 2011-02-09
BEIHANG UNIV
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Problems solved by technology

[0003] In the real-time encoding and decoding system, during the transmission of the AAC data frame, bit errors inevitably occur, and the cyclic redundancy check code is used for error detection. If a bit error occurs, the AAC encoder must retransmit the erroneous data frame. Guarantee uninterrupted decoding output audio, but using this method will lead to complex transmission control mechanism, increased system resources, and poor robustness

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  • FAAC and FAAD2-based single track constant bit rate audio realtime coding and decoding error correcting method
  • FAAC and FAAD2-based single track constant bit rate audio realtime coding and decoding error correcting method
  • FAAC and FAAD2-based single track constant bit rate audio realtime coding and decoding error correcting method

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[0025] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] The invention provides an audio real-time codec error correction method based on FAAC and FAAD2 monophonic fixed bit rate. See attached figure 1 , the error correction method mainly includes: the encoder performs Hamming encoding (110) on the fixed (101) and variable (102) frame headers respectively, and ID_SCE (103), SCETAG (104), global scale factor (105) and ID_END (109) is grouped into one group and carries out Hamming encoding, side information (106) Hamming encoding, data area (107) is grouped according to the size of filling data area (108), and each group of data is carried out Hamming encoding; From each The check digit data is separated from the Hamming code, and stored in the filling data area (108) in sequence; the decoder obtains the check bit data from the filling data area, and performs Hamming code error checking and er...

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Abstract

The invention provides a free advanced audio coder(FAAC) and AAC audio decoder (FAAD2)-based single track constant bit rate audio realtime coding and decoding error correcting method, which mainly comprises that: a coder performs Hamming coding of fixed and variable frame headers, the Hamming coding of ID-SCE, SCETAG, a global scale factor and ID-END in a group, and Hamming coding of side information, packs a data area according to the size of a padding data area, performs Hamming coding of each data packet, separates check bit data from Hamming codes and stores the check bit data in the padding data area in turn; and a decoder acquires check bit data from the packing data area and performs the Hamming code error checking and correcting of corresponding data bits. On the premise of ensuring the structural integrity of an advanced audio coding (AAC) frame, the method has the capability of correcting errors of AAC data frames.

Description

technical field [0001] The invention relates to an audio real-time coding and decoding error correction method based on FAAC and FAAD2 monophonic fixed bit rate. The error correction method has error correction capability for AAC data frames and belongs to the field of communication. Background technique [0002] Advanced Audio Coding (AAC) is a new generation of perceptual audio compression codec technology developed on the basis of MP3. This technology combines the advantages of various mainstream audio codec technologies. Well, the codec process is highly modular and the channel configuration is flexible. [0003] In the real-time encoding and decoding system, during the transmission of the AAC data frame, bit errors inevitably occur, and the cyclic redundancy check code is used for error detection. If a bit error occurs, the AAC encoder must retransmit the erroneous data frame. Guarantee the uninterruptedness of the decoded output audio, but adopting this method will le...

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Application Information

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IPC IPC(8): G10L19/00H04L1/00G10L19/005
Inventor 毛峡邵伟国
Owner BEIHANG UNIV
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