Title:
VOICE CODING AND DECODING DEVICE AND METHOD INCLUDING SILENT VOICE CODING OPERATING WITH PLURAL RATES
Document Type and Number:
Japanese Patent JP3496618
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the average transmission bit rate of a silent voice part in performing the coding of a voice.
SOLUTION: A silent voice part coding circuit 70 codes an input signal from an input terminal 51 for every frame to deliver an obtained quantization code string to a changeover circuit 56. Moreover, the silent part delivers a decision information (TX-flag) as to whether to which feature parameter a corresponding quantization code string is transmitted or not to a bit string generating circuit 57. A voice part decoding part 71 decodes the signal of the silent voice part by using the TX-flag delivered from a bit string disassembling circuit 58 and the quantization code string delivered from a changeover circuit 59 to deliver the signal to a changeover circuit 62.
Inventors:
Masahiro Serizawa
Hironori Ito
Hironori Ito
Application Number:
JP2000074515A
Publication Date:
February 16, 2004
Filing Date:
March 16, 2000
Export Citation:
Assignee:
NEC
International Classes:
G10L25/78; G10L19/00; G10L19/02; G10L19/04; G10L19/22; H03M7/30; H04B14/04; (IPC1-7): G10L19/00; G10L11/02; G10L19/04; H03M7/30; H04B14/04
Domestic Patent References:
| JP9149104A | ||||
| JP1165235A | ||||
| JP583285A |
Other References:
Ｍａｓａｈｉｒｏ Ｓｅｒｉｚａｗａ， ｅｔ ａｌ，Ａ Ｓｉｌｅｎｃｅ Ｃｏｍｐｒｅｓｓｉｏｎ Ａｌｇｏｒｉｔｈｍ ｆｏｒ Ｍｕｌｔｉ−Ｒａｔｅ／Ｄｕａｌ−Ｂａｎｄｗｉｄｔｈ ＭＰＥＧ−４ ＣＥＬＰ Ｓｔａｎｄａｒｄ，Ｐｒｏｃ．２０００ ＩＥＥＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｃｏｎｆｅｒｅｎｃｅ ｏｎ Ａｃｏｕｓｔｉｃｓ，Ｓｐｅｅｃｈ， ａｎｄ Ｓｉｇｎａｌ Ｐｒｏｃｅｓｓ， ＩＣＡＳＳＰ’００，２０００年 ６月，ｐ．１１７３−１１７６
Ｍａｓａｒｈｉｒｏ Ｓｅｒｉｚａｗａ， ｅｔ ａｌ，Ａ Ｓｉｌｅｎｃｅ Ｃｏｍｐｒｅｓｓｉｏｎ Ａｌｇｏｒｉｔｈｍ ｆｏｒ Ｍｕｌｔｉ−Ｒａｔｅ Ｄｕａｌ−Ｂａｎｄｗｉｄｔｈ ＭＰＥＧ−４ ＣＥＬＰ Ｓｔａｎｄａｒｄ，Ｔｒａｎｓ．ＩＥＩＣＥ ｏｎ Ｉｎｆｏｒｍａｔｉｏｎ ａｎｄ Ｓｙｓｔｅｍｓ，２００３年 ３月，Ｖｏｌ．Ｅ８６−Ｄ， Ｎｏ３，ｐ．４１２−４１７
松尾直樹，他，音声パケット通信における無音区間再生法，昭和６３年電子情報通信学会秋季全国大会講演論文集，１９８８年 ８月１５日，Ｂ−２５２，ｐ．Ｂ−２−１３０
由比藤光宏，他，音声パケット通信におけるホス雑音挿入方式の一検討，１９９０年電子情報通信学会春季全国大会講演論文集，１９９０年 ３月 ５日，Ｂ−５６３，ｐ．３−１４１
Ｍａｓａｒｈｉｒｏ Ｓｅｒｉｚａｗａ， ｅｔ ａｌ，Ａ Ｓｉｌｅｎｃｅ Ｃｏｍｐｒｅｓｓｉｏｎ Ａｌｇｏｒｉｔｈｍ ｆｏｒ Ｍｕｌｔｉ−Ｒａｔｅ Ｄｕａｌ−Ｂａｎｄｗｉｄｔｈ ＭＰＥＧ−４ ＣＥＬＰ Ｓｔａｎｄａｒｄ，Ｔｒａｎｓ．ＩＥＩＣＥ ｏｎ Ｉｎｆｏｒｍａｔｉｏｎ ａｎｄ Ｓｙｓｔｅｍｓ，２００３年 ３月，Ｖｏｌ．Ｅ８６−Ｄ， Ｎｏ３，ｐ．４１２−４１７
松尾直樹，他，音声パケット通信における無音区間再生法，昭和６３年電子情報通信学会秋季全国大会講演論文集，１９８８年 ８月１５日，Ｂ−２５２，ｐ．Ｂ−２−１３０
由比藤光宏，他，音声パケット通信におけるホス雑音挿入方式の一検討，１９９０年電子情報通信学会春季全国大会講演論文集，１９９０年 ３月 ５日，Ｂ−５６３，ｐ．３−１４１
Attorney, Agent or Firm:
Masahiko Desk (2 outside)
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