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Frame Loss Concealment for Audio Decoders Employing Spectral Band Replication
An efficient frame loss concealment technique is proposed for audio decoders employing spectral band replication (SBR). The high frequency bands of the lost frame are reconstructed by estimating the parametric information involved in the SBR process. Utilizing all SBR data from the previous and the next frame, the high-band envelope is adaptively estimated from the energy evolution of the surrounding frames. The tonality control parameters are determined so as to ensure smooth transition between the lost frame and its neighbors. Subjective quality evaluation demonstrates that the proposed technique achieves better quality of the concealed audio than the technique adopted in the standard aacPlus decoder.
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