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Water-induced dynamic fractures are the new features affecting the reservoir heterogeneity in low-permeability reservoirs. Due to the high injection pressure, water-induced fractures will generate and propagate when the formation pressure exceeds fracturing pressure during waterflood of low-permeability reservoirs. Based on field production data and waterflood behavior analysis in low-permeability...
This paper makes improvement in G.728 algorithm aiming at reducing coding rate and presents an 8 Kbit/s speech coding algorithm whose delay is 2.5 ms. The size of frame which is 5 samples in G.728 is extended to 20 samples. Adaptive codebook is introduced, which is composed of the recent excitation.20 dimensions normalized fixed codebook is adopted for the proposed algorithm. The exact gain of adaptive...
This paper presents an 8 Kbit/s speech coding algorithm whose delay is 2.5 ms on the base of G.728 algorithm to reduce coding rate. Adaptive codebook structure is introduced in the proposed algorithm, which is composed of the recent excitation. The algorithm uses double codebook structure which contains adaptive codebook and normalized fixed codebook. In codebook searching, the algorithm detects backward...
It is a difficult question How to evaluate a parameter's significance of segmenting speech signal to unvoiced or voiced. An application of granular computing with this topic is presented in this paper. By analyzing eight parameters of speech signal, a decision table has been constructed depending on the granulation theory, which provides a method to find of the significance of parameters judging unvoiced/voiced...
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