Title:
【発明の名称】複雑さが軽減された信号送信システム
Document Type and Number:
Japanese Patent JPH11504492
Kind Code:
A
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.
Inventors:
Upperman Fried Helm
Devont Franciscus Marinus Josephus
Devont Franciscus Marinus Josephus
Application Number:
JP52914197A
Publication Date:
April 20, 1999
Filing Date:
January 31, 1997
Export Citation:
Assignee:
Philips Electronics Nemrose Fennaught Shap
International Classes:
G10L19/12; H03M7/30; H04B1/62; (IPC1-7): H04B1/62; G10L9/14; G10L9/18
Attorney, Agent or Firm:
Masao Sawada