关键词: 差错隐藏, 导谱频率, 导谱频率（ISF）距离, 音视频编码标准-第10部分（AVS-P10）

Abstract: Error concealment for hybrid Algebraic Code Excited Linear Prediction（ACELP） and transform codecs is proposed to reduce the effect of the packet loss and network jitter during the audio transmission. When the frame is not successfully received, its Immittance Spectral Frequencies（ISF） coefficients are reproduced using previous good frames’ ISF coefficients. The number and perceptual weight of the previous usable good frames are decided by their correlation to the current frame in ISF distance. The original error concealment methods usually use fixed number of previous good frames to recover the missing frame. When facing with versatile audio inputs, the proposed adaptive algorithm is more effective compared with the original fixed number methods. The objective results show that the proposed algorithm has 42% reduction of spectral distortion for AVS-P10 codec at error frame rate from 1% to 10%. The subject result also validates the advantage of this paper. The algorithm can be used in the error concealment of other parameters like adaptive and fixed codebook.

Key words: error concealment, immittance spectral frequencies, Immittance Spectral Frequencies（ISF） distance, Audio and Video coding Standard-Part 10（AVS-P10）