Title:
無損失オーディオ符号化方法、無損失オーディオ符号化装置、無損失オーディオ復号化方法、無損失オーディオ復号化装置及び記録媒体
Document Type and Number:
Japanese Patent JP5384780
Kind Code:
B2
Abstract:
Provided are a lossless audio encoding/decoding method and apparatus. The lossless audio encoding method includes converting an audio signal in a time domain into an audio spectral signal with an integer in a frequency domain, mapping the audio spectral signal in the frequency domain to a bit plane signal according to its frequency, and losslessly encoding binary samples of bit planes using a probability model determined according to a predetermined context. The lossless audio decoding method includes extracting a predetermined lossy bitstream that is lossy encoded and an error bitstream from error data by demultiplexing an audio bitstream, the error data corresponding to a difference between lossy encoded audio data and an audio spectral signal with an integer in a frequency domain; lossy decoding the extracted encoded lossy bitstream; losslessly decoding the extracted error bitstream; restoring the original audio frequency spectral signal using the decoded lossy bitstream and error bitstream; and restoring the original audio signal in a time domain by performing inverse integer time-to-frequency conversion on the audio spectral signal. Accordingly, it is possible to encode/decode an audio signal at the optimum compression rate using a probability model based on the statistical distribution of integer MDCT coefficients, rather than the substantial distribution of integer MDCT coefficients. Also, it is possible to compress an audio signal at the optimum compression rate using context-based encoding better than when using BPGC.
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Inventors:
Kinshige
Seedling
Lee Tokwa
Gold Bomb
Kure Yumi
Money
Seedling
Lee Tokwa
Gold Bomb
Kure Yumi
Money
Application Number:
JP2005052508A
Publication Date:
January 08, 2014
Filing Date:
February 28, 2005
Export Citation:
Assignee:
Samsung Electronics Co.,Ltd.
International Classes:
G10L19/02; G10L19/038; G10L19/00; H04N5/60
Domestic Patent References:
| JP2001230935A |
Other References:
R.Yu,C.C.Ko,S.Rahardja,X.Lin, Bit-Plane Golomb Coding for Sources with Laplacian Distributions, Acoustics Speech and Signal Processing 2003,米国,IEEE,2003年6月4日
Majid Rabbani,Paul W.Melnychuck,Conditioning Contexts for the Arithmetic Coding of Bit Planes, IEEE Transactions on Signal Processing,米国,IEEE,1992年1月
Majid Rabbani,Paul W.Melnychuck,Conditioning Contexts for the Arithmetic Coding of Bit Planes, IEEE Transactions on Signal Processing,米国,IEEE,1992年1月
Attorney, Agent or Firm:
Tadashige Ito
Tadahiko Ito
Shinsuke Onuki
Tadahiko Ito
Shinsuke Onuki