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.
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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 |
代理机构 |
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地址 |
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