abstract = "Based on the linear prediction theory, This paper
proposes a nonlinear bi-directional prediction model
for speech signals. After the data preprocessing, an
improved GP is used to construct bi-directional
prediction model of each frame. Then by the analysis of
these models, the normalised nonlinear bi-directional
prediction model is obtained. In the experiments, the
DUPSO algorithm is used to optimise the parameters. By
comparing the SNR and MMSE with the linear prediction
model, the superiority of the proposed nonlinear
bi-directional prediction model is proved.",