JP5076248B2 - 変換器、変換方法、プログラム、及び、記録媒体 - Google Patents
変換器、変換方法、プログラム、及び、記録媒体 Download PDFInfo
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- JP5076248B2 JP5076248B2 JP2009524464A JP2009524464A JP5076248B2 JP 5076248 B2 JP5076248 B2 JP 5076248B2 JP 2009524464 A JP2009524464 A JP 2009524464A JP 2009524464 A JP2009524464 A JP 2009524464A JP 5076248 B2 JP5076248 B2 JP 5076248B2
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/0617—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence
- H03M1/0675—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence using redundancy
- H03M1/069—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence using redundancy by range overlap between successive stages or steps
- H03M1/0692—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence using redundancy by range overlap between successive stages or steps using a diminished radix representation, e.g. radix 1.95
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L19/0212—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using orthogonal transformation
- G10L19/0216—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using orthogonal transformation using wavelet decomposition
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Analogue/Digital Conversion (AREA)
Description
parameter)の変化に対するxと復号値xDの最悪近似誤差を比較する。図5は、N=32、β=1.77777に対し、xとνの変化による変換の最悪の精度を示す図である。図5によれば、β=1.77777のとき、提案したアルゴリズムの精度がDaubechesのアルゴリズムのものよりも優れていることが分かる。そして、提案したアルゴリズムにおいて、cautious schemeが他のschemeよりもより正確であることがわかる。
Claims (7)
- Lビットの数bi(i=1,…,L)に基づくサンプル値xの復号値を求める変換器であって、
γ=1/β(ただし、βは1<β<2)に対し復号値xDを(eq1)式により求める復号手段を備える変換器。
- x∈(0,1)とy=1−x∈(0,1)をβ変換したときのビット列をそれぞれLビットの数bi、ci(i=1,…,L)とし、それぞれの復号値xD、yDについてxDを(eq1)式で表しyDを(eq1)式におけるbiをciに代えたもので表す場合において、γは(eq2)式により与えられる方程式P(γ)=0の根である、請求項1記載の変換器。
- マルコフ遷移行列を、β/(β2−1)≦ν<β2/(β2−1)ならば(eq3)式と近似し、ν<β/(β2−1)ならば(eq4)式と近似し、β2/(β2−1)≦νならば(eq5)式と近似する行列推定手段を備える、請求項1又は2記載の変換器。
- (eq6)式により与えられるn00、n01、n10及びn11に対して、β変換の2×2マルコフ遷移行列を(eq7)式により推定する行列推定手段を備える、請求項1から3のいずれかに記載の変換器。
- Lビットの数bi(i=1,…,L)に基づくサンプル値xの復号値を求めるデジタル信号とアナログ信号間の変換を行う変換方法であって、
復号手段が、γ=1/β(ただし、βは1<β<2)に対し復号値xDを(eq8)式により求めるステップを含む変換方法。
- コンピュータを、請求項1から4のいずれかに記載の変換器として機能させるためのプログラム。
- 請求項6記載のプログラムを記録する記録媒体。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009524464A JP5076248B2 (ja) | 2007-07-20 | 2008-07-17 | 変換器、変換方法、プログラム、及び、記録媒体 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007189899 | 2007-07-20 | ||
JP2007189899 | 2007-07-20 | ||
PCT/JP2008/062897 WO2009014057A1 (ja) | 2007-07-20 | 2008-07-17 | 変換器、変換方法、プログラム、及び、記録媒体 |
JP2009524464A JP5076248B2 (ja) | 2007-07-20 | 2008-07-17 | 変換器、変換方法、プログラム、及び、記録媒体 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPWO2009014057A1 JPWO2009014057A1 (ja) | 2010-09-30 |
JP5076248B2 true JP5076248B2 (ja) | 2012-11-21 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2009524464A Expired - Fee Related JP5076248B2 (ja) | 2007-07-20 | 2008-07-17 | 変換器、変換方法、プログラム、及び、記録媒体 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7994952B2 (ja) |
EP (1) | EP2169832A4 (ja) |
JP (1) | JP5076248B2 (ja) |
KR (1) | KR101109614B1 (ja) |
TW (1) | TWI433469B (ja) |
WO (1) | WO2009014057A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20110020815A (ko) * | 2008-08-25 | 2011-03-03 | 도쿠리쓰교세이호징 가가쿠 기주쓰 신코 기코 | 신호변환기, 파라미터 결정장치, 파라미터 결정방법, 프로그램 및 기록매체 |
WO2011125296A1 (ja) | 2010-04-01 | 2011-10-13 | 独立行政法人科学技術振興機構 | スケール付きβ写像に基づくデータコンバート方式 |
JP5252668B2 (ja) | 2010-04-06 | 2013-07-31 | 独立行政法人科学技術振興機構 | 負のβ写像に基づくデータコンバート方式 |
JP5436508B2 (ja) * | 2011-09-22 | 2014-03-05 | 独立行政法人科学技術振興機構 | アナログ‐デジタル変換器及びアナログ信号をデジタル信号に変換する方法 |
JP6205215B2 (ja) | 2013-09-09 | 2017-09-27 | オリンパス株式会社 | 撮像装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001036413A (ja) * | 1999-06-18 | 2001-02-09 | Alcatel | 信号を符号化する方法 |
JP2001196932A (ja) * | 2000-01-07 | 2001-07-19 | Kenwood Corp | D/a変換装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US5099450A (en) * | 1988-09-22 | 1992-03-24 | Syracuse University | Computer for reducing lambda calculus expressions employing variable containing applicative language code |
FI86120C (fi) * | 1990-07-02 | 1992-07-10 | Nokia Mobile Phones Ltd | A/d- eller d/a-omvandlare, a/d- eller d/a-omvandlarsystem samt kalibreringsfoerfarande foer dessa. |
US7602323B2 (en) * | 2007-04-04 | 2009-10-13 | The Regents Of The University Of California | Digital background correction of nonlinear error ADC's |
-
2008
- 2008-07-17 EP EP08778239A patent/EP2169832A4/en not_active Withdrawn
- 2008-07-17 TW TW097127069A patent/TWI433469B/zh not_active IP Right Cessation
- 2008-07-17 JP JP2009524464A patent/JP5076248B2/ja not_active Expired - Fee Related
- 2008-07-17 US US12/669,860 patent/US7994952B2/en not_active Expired - Fee Related
- 2008-07-17 WO PCT/JP2008/062897 patent/WO2009014057A1/ja active Application Filing
- 2008-07-17 KR KR1020097023935A patent/KR101109614B1/ko not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001036413A (ja) * | 1999-06-18 | 2001-02-09 | Alcatel | 信号を符号化する方法 |
JP2001196932A (ja) * | 2000-01-07 | 2001-07-19 | Kenwood Corp | D/a変換装置 |
Also Published As
Publication number | Publication date |
---|---|
US7994952B2 (en) | 2011-08-09 |
US20100207796A1 (en) | 2010-08-19 |
KR20100010504A (ko) | 2010-02-01 |
TWI433469B (zh) | 2014-04-01 |
KR101109614B1 (ko) | 2012-01-31 |
WO2009014057A8 (ja) | 2009-10-22 |
JPWO2009014057A1 (ja) | 2010-09-30 |
EP2169832A1 (en) | 2010-03-31 |
WO2009014057A1 (ja) | 2009-01-29 |
EP2169832A4 (en) | 2012-07-25 |
TW200915733A (en) | 2009-04-01 |
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