發(fā)布時間：2018-02-25 05:27

  本文關(guān)鍵詞： 語音編碼 自適應(yīng)多速率 線性預(yù)測 協(xié)方差 前瞻　出處：《北京理工大學學報》2014年07期 　論文類型：期刊論文

【摘要】：為降低自適應(yīng)多速率(AMR)語音編碼器的時延,提出了一種去除其前瞻時延的方法.此方法采用協(xié)方差算法計算線性預(yù)測系數(shù),然后用線性預(yù)測系數(shù)外推得到新樣點.用新推得的樣點取代原來的前瞻樣點,從而去除了編碼器的前瞻時延.進一步對重建語音質(zhì)量分別進行了客觀評價和主觀評價,并且計算了算法復(fù)雜度.實驗結(jié)果表明該方法在去除前瞻時延的同時,重建語音質(zhì)量接近原始AMR的重建語音質(zhì)量.
[Abstract]:In order to reduce the delay of adaptive multi-rate AMR-speech encoder, a method to eliminate the forward delay is proposed. The covariance algorithm is used to calculate the linear prediction coefficient. Then the new sample points are obtained by extrapolating the linear prediction coefficients, and the original prospective samples are replaced by the new ones, thus the forward delay of the encoder is removed. The objective and subjective evaluation of the reconstructed speech quality is carried out, respectively. The algorithm complexity is calculated and the experimental results show that the reconstructed speech quality is close to that of the original AMR at the same time as the prospective delay is removed.
【作者單位】： 北京理工大學信息與電子學院;
【分類號】：TN912.3

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