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Acoustic masking can be used to protect the voice information from being eavesdropped. This paper presents a method to generate masking signal which is similar to white noise. It adjusts the white noise spectral energy by linear prediction of the masked speech spectral envelope in real time. The proposed method can accurately determine the frequency spectrum of the masking speech signal, and can adaptively...
LBG algorithm is commonly used in multidimensional signal processing. It's one of the most effective methods to generate codebooks. Better initial codebook of LBG algorithm leads to better quality of final codebook. In order to find one effective method to design LBG initial codebook, four design methods of initial codebook for LBG algorithm are compared, including Random method, Splitting method,...
High efficient quantization of band pass voicing coefficients (BPVC) for the super frame plays an important role in low-bit-rate speech coding algorithms based on mixed excitation linear prediction (MELP). A reconstruction algorithm of BPVC based on mode transition and codebook mapping is proposed in this paper. It defines the transition mode according to the quantization index for BPVC of the current...
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