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 from a one-dimensional codebook 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 only every L<th> codebook entry for preselecting a plurality of excitation sequences. With this small number of excitation sequences a full complexity search is made in which all excitation sequences surrounding the preselected ones are involved in the selection. |
申请公布号 |
WO9730524(A1) |
申请公布日期 |
1997.08.21 |
申请号 |
WO1997IB00068 |
申请日期 |
1997.01.31 |
申请人 |
PHILIPS ELECTRONICS N.V.;PHILIPS NORDEN AB |
发明人 |
WUPPERMANN, FRIEDHELM;DE BONT, FRANSISCUS, MARINUS, JOSEPHUS |
分类号 |
G10L19/12;H03M7/30;H04B1/62;(IPC1-7):H04B1/62;G10L9/14 |
主分类号 |
G10L19/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|