Title:
A conversion field code book device in CELP coda
Document Type and Number:
Japanese Patent JP6173304
Kind Code:
B2
Abstract:
Codebook Arrangement for use in coding an input sound signal includes First and Second Codebook Stages. First Codebook Stage includes one of a time-domain CELP codebook and a transform-domain codebook. Second Codebook Stage follows the first codebook stage and includes the other of the time-domain CELP codebook and the transform-domain codebook. Codebook Stage includes an adaptive codebook may be provided before First Codebook Stage. A selector may be provided to select an order of the time-domain CELP codebook and the transform-domain codebook in First and Second Codebook Stages, respectively, as a function of characteristics of the input sound signal. The selector may also be responsive to both the characteristics of the input sound signal and a bit rate of the codec using Codebook Arrangement to bypass Second Codebook Stage. Codebook Arrangement can be used in a coder of an input sound signal.
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Inventors:
Vaklav Exler
Application Number:
JP2014509572A
Publication Date:
August 02, 2017
Filing Date:
May 09, 2012
Export Citation:
Assignee:
Voice Age Corporation
International Classes:
G10L19/08; G10L19/16
Foreign References:
| US20080040105 |
Other References:
Jurgen Schnitzler,WIDE BAND SPEECH CODING USING FORWARD/BACKWARD ADAPTIVE PREDICTION WITH MIXED TIME/FREQUENCY DOMAIN EXCITATION,IEEE,1999年
Jar-Ferr YANG,Transform-Based CELP Vocoders with Low-Delay Low-Complexity and Variable-Rate Features,IEICE,2002年 6月
Jar-Ferr YANG,Transform-Based CELP Vocoders with Low-Delay Low-Complexity and Variable-Rate Features,IEICE,2002年 6月
Attorney, Agent or Firm:
Yasuhiko Murayama
Masatake Shiga
Takashi Watanabe
Shinya Mitsuhiro
Masatake Shiga
Takashi Watanabe
Shinya Mitsuhiro
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