发明名称 REDUCED COMPLEXITY SIGNAL TRANSMISSION SYSTEM
摘要 In a CELP coder a comparison between a target signal and a plurality of synthetic signals is made. The synthetic signal is derived by filtering a plurality of excitation sequences by a synthesis filter having parameters derived from the target signal. The excitation signal which results in a minimum error between the target signal and the synthetic signal is selected. The search for the best excitation signal requires a substantial computational complexity. To reduce the complexity a preselection of a small number of excitation sequences is made by selecting a small number of excitation sequences resembling the most a backward filtered target signal. With this small number of excitation sequences a full complexity search is made. Due to the reduced number of excitation sequences involved in the final selection the required computational complexity is reduced.
申请公布号 CA2218223(A1) 申请公布日期 1997.08.21
申请号 CA19972218223 申请日期 1997.01.31
申请人 PHILIPS ELECTRONICS N.V. 发明人 WUPPERMANN, FRIEDHELM;DE BONT, FRANSISCUS MARINUS JOZEPHUS
分类号 G10L19/12;H03M13/00;(IPC1-7):H03M13/00 主分类号 G10L19/12
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