公开(公告)号：US20010014856A1

公开(公告)日：2001-08-16

申请号：US09761196

申请日：2001-01-16

Applicant: U.S. PHILIPS CORPORATION

Inventor： Friedhelm Wuppermann ,  Fransiscus M.J. De Bont

IPC: G10L019/04 ,  G10L019/08 ,  G10L019/10

CPC classification number: G10L19/12 ,  G10L2019/0013

Abstract: 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.

Abstract translation: 在CELP编码器中，进行目标信号和多个合成信号之间的比较。 通过具有从目标信号导出的参数的合成滤波器对多个激励序列进行滤波而导出合成信号。 选择导致目标信号和合成信号之间的最小误差的激励信号。 搜索最佳激励信号需要大量的计算复杂度。 为了降低复杂度，通过选择少量的类似于反向滤波的目标信号的激励序列来进行少量激励序列的预选。 利用这种少量的激励序列，进行完全复杂的搜索。 由于在最终选择中涉及的激励序列数量减少，所需的计算复杂度降低。

公开(公告)号：US20010006537A1

公开(公告)日：2001-07-05

申请号：US09761197

申请日：2001-01-16

Applicant: U.S. PHILIPS CORPORATION

Inventor： Friedhelm Wuppermann ,  Fransiscus M.J. De Bont

IPC: G10L013/00

CPC classification number: G10L19/12 ,  G10L2019/0013

Abstract: 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.