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• W2187778734 abstract "Parameter quantization is very important for the synthetic speech quality of the vocoder. A new distortion measure for pitch as well as lsf quantization in ultra low bit rate Vocoder, whose parameters for several consecutive frames are grouped into a vector and jointly quantized to obtain high coding efficiency, is proposed based on mixed excitation linear prediction(MELP) vocoder. The product of sum of band pass voicing coefficients and gain parameter is used to denote the weighting factor of pitch as well as lsf parameters of current speech frame in the consecutive frames using weighted squared Euclidean distance measure to search the vector codebook. Comparing with the traditional method for a constant weighting factor by distinguishing Voiced/Unvoiced(UV) pattern of each speech frame, objective test results show that the quantization distortion of pitch is reduced by 3.3% and the mean opinion score (MOS) is increased by almost 0.1(3.5%). Index Terms—speech coding; superframe; pitch quantization;lsf quantization" @default.
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• W2187778734 date "2010-01-01" @default.
• W2187778734 modified "2023-09-26" @default.
• W2187778734 title "A NEW DISTORTION MEASURE FOR PARAMETER QUANTIZATION BASED ON MELP Ye Li 1" @default.
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