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method and decoder for the detection of incorrect together based on spectral differences to the last error free frame
method and decoder for the detection of incorrect together based on spectral differences to the last error free frame
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机译:到最后一个无错误帧的频谱差异一起检测错误的方法和解码器
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摘要
The present invention relates to a method for detecting bad speech frames e.g in mobile systems such as TETRA and a corresponding decoder.A spectral discontinuity between consecutive decoded frames is detected on the basis of line spectral pair (LSP) coefficients calculated from frame data (C). A change in gain between consecutive frames is also detected by extraction of frame gain parameter (E). Speech frames are considered errorfree if either of the spectral discontinuity or the change in gain lie below predetermined thresholds (D,F). In case both the spectral discontinuity and the change in gain exceed these thresholds, an energy difference is calculated to consecutive frames detecting an error only if a given threshold is exceeded (I). This way, large spectral discontinuities which occur often for low energy levels do not automatically lead to the false detection of frame errors. IMAGE
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