Title:
【発明の名称】音声符号化方法
Document Type and Number:
Japanese Patent JP3068689
Kind Code:
B2
Abstract:
PURPOSE:To apply a delayed decision method for code excitation linear prediction encoding and to decrease the calculation quantity. CONSTITUTION:One adaptive excitation vector in an adaptive code book 106 is updated with respective adaptive excitation vectors of pair candidates of a last subframe, a synthesized speech vector is generated at each updating operation according to the adaptive excitation vector of the adaptive code book 106 and the quantized value of a short-time prediction coefficient to calculate the error between the synthesized speech vector and a source speech vector by a squaring error calculator 109; and a specific number of adaptive code indexes in the increasing order of the cumulative value of the error and the error cumulative value of the pair candidate of the last subframe are retrieved as adaptive code index candidates. Thus, the adaptive code indexes are narrowed down at the stage of the retrieval to decrease the calculation quantity.
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Inventors:
Yoshihiro Ariyama
Kenichiro Hosoda
Hiroshi Katsuragawa
Hiromi Aoyagi
Kenichiro Hosoda
Hiroshi Katsuragawa
Hiromi Aoyagi
Application Number:
JP34354991A
Publication Date:
July 24, 2000
Filing Date:
December 25, 1991
Export Citation:
Assignee:
Oki Electric Industry Co., Ltd.
International Classes:
G10L19/038; G10L19/04; G10L19/08; G10L19/12; (IPC1-7): G10L19/12; G10L19/00; G10L19/04
Domestic Patent References:
| JP5216500A | ||||
| JP4271400A |
Other References:
Ｐｒｏｃｅｅｄｉｎｇｓ ｏｆ ＩＥＥＥ １９８９ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｃｏｎｆｅｒｅｎｃｅ ｏｎ Ａｃｏｕｓｔｉｃｓ，Ｓｐｅｅｃｈ ａｎｄ Ｓｉｇｎａｌ Ｐｒｏｃｅｓｓｉｎｇ，Ｖｏｌ．１，”Ｓ２．７ Ｓｐｅｅｃｈ Ｃｏｄｉｎｇ ｗｉｔ Ｔｉｍｅ−Ｖａｒｉｎｇ Ｂｉｔ Ａｌｌｏｃａｔｉｏｎｓ ｔｏ Ｅｘｃｉｔａｔｉｏｎ ａｎｄ ＬＰＣ Ｐａｒａｍｅｔｅｒｓ”ｐ．６５−６８，２３−２６ Ｍａｙ，１９８９
Ｐｒｏｃｅｅｄｉｎｇｓ ｏｆ ＩＥＥＥ １９９０ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｃｏｎｆｅｒｅｎｃｅ ｏｎ Ａｃｏｕｓｔｉｃｓ，Ｓｐｅｅｃｈ ａｎｄ Ｓｉｇｎａｌ Ｐｒｏｃｅｓｓｉｎｇ，Ｖｏｌ．１，”Ｓ１．６ ８ｋｂｉｔ／ｓ Ｄｅｌａｙｅｄ Ｄｅｃｉｓｉｏｎ ＣＥＬＰ Ｃｏｄｅｒ Ｕｓｉｎｇ Ｔｒｅｅ Ｃｏｄｉｎｇ”ｐ．２１−２４，Ａｐｒｉｌ ３−６，１９９０
Ｐｒｏｃｅｅｄｉｎｇｓ ｏｆ ＩＥＥＥ １９９１ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｃｏｎｆｅｒｅｎｃｅ ｏｎ Ａｃｏｕｓｔｉｃｓ，Ｓｐｅｅｃｈ ａｎｄ Ｓｉｇｎａｌ Ｐｒｏｃｅｓｓｉｎｇ，Ｖｏｌ．１，”Ｓ４．４ ４ｋｂ／ｓ Ｉｍｐｒｏｖｅｄ ＣＥＬＰ Ｃｏｄｅｒ ｗｉｔｈ Ｅｆｆｉｃｉｅｎｔ Ｖｅｃｔｏｒ Ｑｕａｎｔｉｚａｔｉｏｎ”ｐ．２１３−２１６，Ｍａｙ １４−１７，１９９１
電子情報通信学会論文誌 Ｖｏｌ．Ｊ７４−Ａ Ｎｏ．４，Ａｐｒｉｌ １９９１，「木符号化を用いたディレードデシジョンＣＥＬＰ符号化」，ｐ．６１９−６２７，（平成３年４月２５日発行）
Ｐｒｏｃｅｅｄｉｎｇｓ ｏｆ ＩＥＥＥ １９９０ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｃｏｎｆｅｒｅｎｃｅ ｏｎ Ａｃｏｕｓｔｉｃｓ，Ｓｐｅｅｃｈ ａｎｄ Ｓｉｇｎａｌ Ｐｒｏｃｅｓｓｉｎｇ，Ｖｏｌ．１，”Ｓ１．６ ８ｋｂｉｔ／ｓ Ｄｅｌａｙｅｄ Ｄｅｃｉｓｉｏｎ ＣＥＬＰ Ｃｏｄｅｒ Ｕｓｉｎｇ Ｔｒｅｅ Ｃｏｄｉｎｇ”ｐ．２１−２４，Ａｐｒｉｌ ３−６，１９９０
Ｐｒｏｃｅｅｄｉｎｇｓ ｏｆ ＩＥＥＥ １９９１ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｃｏｎｆｅｒｅｎｃｅ ｏｎ Ａｃｏｕｓｔｉｃｓ，Ｓｐｅｅｃｈ ａｎｄ Ｓｉｇｎａｌ Ｐｒｏｃｅｓｓｉｎｇ，Ｖｏｌ．１，”Ｓ４．４ ４ｋｂ／ｓ Ｉｍｐｒｏｖｅｄ ＣＥＬＰ Ｃｏｄｅｒ ｗｉｔｈ Ｅｆｆｉｃｉｅｎｔ Ｖｅｃｔｏｒ Ｑｕａｎｔｉｚａｔｉｏｎ”ｐ．２１３−２１６，Ｍａｙ １４−１７，１９９１
電子情報通信学会論文誌 Ｖｏｌ．Ｊ７４−Ａ Ｎｏ．４，Ａｐｒｉｌ １９９１，「木符号化を用いたディレードデシジョンＣＥＬＰ符号化」，ｐ．６１９−６２７，（平成３年４月２５日発行）
Attorney, Agent or Firm:
Kenji Ohnishi