As one of the current most potential low bit rates speech coding schemes

waveform interpolation model with its high performance

has been paid more and more attention.Based on a kind of Singular Value Decomposition method for decomposing Characteristic Waveform in WI speech coding

the magnitude spectrum of CW is perceptually divided into basic matrix

transitional matrix and supplemental matrix to be quantized respectively

which effectively reduce the computational complexity;In addition

there are three patterns to represent the magnitude spectrum of CW combined by the matrixes above

and then Periodic Factor and Energy Entropy are introduced to indicate the periodicity of matrix

which solved the problems for quantization of parameters after SVD and improved the efficiency of coding.Subjective A/B listening tests indicated that the reconstructed speech quality of the 2.4kbps SVD-WI codec is a little better than that of 2.4kbps MELP coder.