Method for generating random code book of code-excited linear pr

Details Method for generating random code book of code-excited linear pr Method for generating random code book of code-excited linear pr

1996-11-27

1998-10-20

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704223, 704219, G10L 302, G10L 900

Patent

active

058262237

ABSTRACT:
A method for generating a random code book having a characteristic similar to a periodic component of voice in code-excited linear predictive (CELP) coding. The method includes generating an adaptive code book that removes the periodic component of a current subframe of a speech signal. An adaptive code book array is generated with respect to the current subframe on the basis of an optimal delay and gain obtained in generating the adaptive code book. A number of code word arrays are generated from the adaptive code book array and the excited signal of the immediately previous subframe. A code word that has the maximum value is selected from each code word array generated in the code word array generating step. Each code word array is normalized using the selected code word. The normalized maximum value in each code word array is selected and scaled by the power of the most previous frame. A random code book including a set of the scaled selected maximum values is generated. The method for generating a random code book generates a random code book using adaptive code book information, and, as a result, has the effect of providing improved synthesized sound compared with a conventional CELP coder.

REFERENCES:
patent: 5457783 (1995-10-01), Chhatwal
Campbell Jr. et al.; "The DOD 4.8 KBPS Standard (Proposed Federal Standard 1016)"; U.S. Government Dept. of Defense, Ft. Meade, MD, pp. 121-133.

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