Title:
ENCODING DEVICE AND ENCODING METHOD
Document Type and Number:
WIPO Patent Application WO/2011/086900
Kind Code:
A1
Abstract:
Disclosed are an encoding device and encoding method capable of improving the quality of a decoded signal under very low bit rate conditions using a small amount of computation. A spectrum correction unit (302) performs correction processing on the subspectrum in each subband in such a manner that samples equal to or greater than a subspectrum average value are left unchanged while samples smaller than the subspectrum average value are replaced by zero. As a result of this, it is possible to significantly reduce the number of bits required to quantize the subspectrums without substantial reduction in quality in a local search unit (303) and in a multi-rate indexing unit (304).
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Inventors:
YAMANASHI TOMOFUMI
OSHIKIRI MASAHIRO
OSHIKIRI MASAHIRO
Application Number:
PCT/JP2011/000096
Publication Date:
July 21, 2011
Filing Date:
January 12, 2011
Export Citation:
Assignee:
PANASONIC CORP (JP)
YAMANASHI TOMOFUMI
OSHIKIRI MASAHIRO
YAMANASHI TOMOFUMI
OSHIKIRI MASAHIRO
International Classes:
G10L19/032; G10L19/038; H03M7/30
Domestic Patent References:
| WO2009059333A1 | 2009-05-07 |
Foreign References:
| JPH09230898A | 1997-09-05 | |||
| JPH11330977A | 1999-11-30 | |||
| JP2005528839A | 2005-09-22 |
Other References:
STEPHANE RAGOT ET AL.: "LOW-COMPLEXITY MULTI-RATE LATTICE VECTOR QUANTIZATION WITH APPLICATION TO WIDEBAND TCS SPEECH CODING AT 32KBIT/S", PROCEEDINGS OF THE IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, 2004, vol. I, 17 May 2004 (2004-05-17), pages 501 - 504, XP010717675
STEPHANE RAGOT; BRUNO BESSETTE; ROCH LEFEBVRE: "Low-complexity Multi-rate Lattice Vector Quantization with Application to Wideband TCX Speech Coding", ICASSP, 2004
MINJIE XIE; JEAN-PIERRE ADOUL: "Embedded Algebraic Vector Quantizers (EAVQ) with Application to Wideband Speech Coding", IEEE, 1996
"ITU-T:G.718; Frame error robust narrowband and wideband embedded variable bit-rate coding of speech and audio from 8-32 kbit/s", ITU-T RECOMMENDATION G.718, 2008
See also references of EP 2525354A4
STEPHANE RAGOT; BRUNO BESSETTE; ROCH LEFEBVRE: "Low-complexity Multi-rate Lattice Vector Quantization with Application to Wideband TCX Speech Coding", ICASSP, 2004
MINJIE XIE; JEAN-PIERRE ADOUL: "Embedded Algebraic Vector Quantizers (EAVQ) with Application to Wideband Speech Coding", IEEE, 1996
"ITU-T:G.718; Frame error robust narrowband and wideband embedded variable bit-rate coding of speech and audio from 8-32 kbit/s", ITU-T RECOMMENDATION G.718, 2008
See also references of EP 2525354A4
Attorney, Agent or Firm:
WASHIDA, KIMIHITO (JP)
Koichi Washida (JP)
Koichi Washida (JP)
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Claims: