A Method to Skip Look-Ahead Samples in AMR Speech Codec

A method was proposed to skip the look-ahead samples in this paper. Firstly, the method used the covariance algorithm to calculate the linear prediction (LP) coefficients. Secondly, LP coefficients were utilized to produce the new samples. Finally, the new samples were used to replace the look-ahead samples. To evaluate the voice quality, the objective evaluation and subjective evaluation were designed respectively and the complexity test was calculated. Experiments show that the reconstructed quality of the proposed method is near to the original AMR codec, and the delay of the proposed method is lower 5 ms than the original method.