JP4504414B2 - 冗長性低減方法 - Google Patents
冗長性低減方法 Download PDFInfo
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- JP4504414B2 JP4504414B2 JP2007323655A JP2007323655A JP4504414B2 JP 4504414 B2 JP4504414 B2 JP 4504414B2 JP 2007323655 A JP2007323655 A JP 2007323655A JP 2007323655 A JP2007323655 A JP 2007323655A JP 4504414 B2 JP4504414 B2 JP 4504414B2
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- 238000000034 method Methods 0.000 title claims description 21
- 230000009467 reduction Effects 0.000 title claims description 11
- 230000003595 spectral effect Effects 0.000 claims description 40
- 238000005070 sampling Methods 0.000 claims description 34
- 230000005236 sound signal Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 description 14
- 230000003044 adaptive effect Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000013139 quantization Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013383 initial experiment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
- H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
- G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
- H04B1/665—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using psychoacoustic properties of the ear, e.g. masking effect
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
- H04B14/046—Systems or methods for reducing noise or bandwidth
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/42—Arrangements for resource management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Business, Economics & Management (AREA)
- General Business, Economics & Management (AREA)
- Computational Linguistics (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Description
複数の第1スペクトル成分の少なくとも1つと複数の第2スペクトル成分の少なくとも1つとの間で、時間的にずれた統計的相互相関を検出し、
少なくとも1つの第1スペクトル成分と少なくとも1つの第2スペクトル成分との間で、少なくとも1つの予測係数と伝搬時間差を前記相互相関に基づいて検出し、
予測誤差e(n)を、少なくとも1つの第1スペクトル成分と少なくとも1つ第2スペクトル成分の関数として検出し、
少なくとも1つの第1スペクトル成分、予測誤差、少なくとも1つの予測係数、および伝搬時間差を受信器に伝送し、
受信器にて少なくとも1つの第2スペクトル成分を、少なくとも1つの第1スペクトル成分、予測誤差、少なくとも1つの予測係数、および伝搬時間差に基づいて復元し、
前記少なくとも1つの予測係数の検出を、少なくとも1つの第1スペクトル成分と少なくとも1つの第2スペクトル成分の一方が音声信号を含まない場合に中止するように構成して解決される。
、遅延度d、予測係数akおよび予測誤差e(n)から、第2のチャネルの信号y(n)を復元し、この信号をサンプリング信号x(n)と共に後続処理のためさらに送出する。
。ステレオ音声信号はことに、種々異なる音響源の信号が2つのチャネルで異なる時点および異なるレベルで発生することを特徴とする。このことは現在公知の方法では不十分にしか考慮されていない。なぜなら、単に左チャネルと右チャネル間の時間的に同じ2つのサンプリング値間の統計的依存性しか利用されていないからである。改善されたアプリケーション、いわゆる適応型チャネル間予測法では、伝搬時間補償された高次の予測が含まれる。この高次の予測により1つのチャネルにおける信号のサンプリング値から他方のチャネルにおける瞬時のサンプリング値に対する推定値が算出される。2チャネル以上の信号に対するアプリケーションもまったく同じように行われる。図2はブロック回路図を示し、図3はチャネル間予測器の実現の実施例のブロック回路図を示す。
e(n)=y(n)-y’(n) (2)
により得られる。
、これによりデータレートが低減される。予測利得
G=(E[y2(n)])/(E[e2(n)])=σy2/σe2 (3)
は分散の比により求められる。
信号x(n)のサンプリング値の分散であり、
rk,i=ri,k=E[x(n-d-k)*x(n-d-i)]/(σxk*σxi) (6)
信号x(n)のサンプリング値の自己相関係数であり、
ci=E[y(n)*x(n-d-i)]/σy*σxi (7)
信号x(n)とy(n)のサンプリング値間の相互相関係数である。
[1]ISO/IEC,"Draft International Standard DIS 11172:Information technology-coding of moving pictures and associated audio for digital storage media aat up to about 1.5 Mbit/s",ISO/IEC JTC1/SC29/WG11,Geneva,April 1992.
[2]J.D.Johnston,"Perceptual Transform Coding of Wideband Stereo Signals",Proc.of the ICASSP 1990.
[3]R.G.van der Waal,R.N.J.Veldhuis,"Subband Coding of Stereophonic Digital Audio Signals",Proc.of the ICASSP 1991.
[4]H.Fuchs,"Report on the MPEG/Audio subjective listening tests in Hannover",ISO/IEC JTC1/SC29/WG11:Doc.-No.MPEG91/331,November 1991.
4 予測器
7 加算器
8 遅延回路
Claims (6)
- 少なくとも第1のチャネルおよび第2のチャネルにおけるデータ伝送の際にデータを低減する方法において、
第1のチャネルを複数の第1スペクトル成分に分割し、第2のチャネルを複数の第2スペクトル成分に分割し、ここで第1のチャネルと第2のチャネルは共通の符号化を使用し、
複数の第1スペクトル成分の少なくとも1つと複数の第2スペクトル成分の少なくとも1つとの間で、時間的にずれた統計的相互相関を検出し、
少なくとも1つの第1スペクトル成分と少なくとも1つの第2スペクトル成分との間で、少なくとも1つの予測係数と伝搬時間差を前記相互相関に基づいて検出し、
予測誤差e(n)を、少なくとも1つの第1スペクトル成分と少なくとも1つ第2スペクトル成分の関数として検出し、
少なくとも1つの第1スペクトル成分、予測誤差、少なくとも1つの予測係数、および伝搬時間差を受信器に伝送し、
受信器にて少なくとも1つの第2スペクトル成分を、少なくとも1つの第1スペクトル成分、予測誤差、少なくとも1つの予測係数、および伝搬時間差に基づいて復元し、
前記少なくとも1つの予測係数の検出を、少なくとも1つの第1スペクトル成分と少なくとも1つの第2スペクトル成分の一方が音声信号を含まない場合に中止し、
前記第1のチャネルと第2のチャネルを音声チャネルおよび画像チャネルを含む群から選択する、ことを特徴とする冗長性低減方法。 - 請求項1記載の方法において、前記相互相関は統計的相関である冗長性低減方法。
- 請求項3記載の方法において、少なくとも1つの第2スペクトル成分の推定値y’(n)を少なくとも1つの第2スペクトル成分のサンプリング値y(n)と比較し、
予測誤差e(n)を前記比較に基づいて検出し、
少なくとも1つの予測係数akと伝搬時間差dを、予測誤差e(n)の
分散σe 2を最小にすることにより最適化する冗長性低減方法。 - 請求項1記載の方法において、予測方向を第1のチャネルと第2のチャネルの帰属関数として検出する冗長性低減方法。
- 請求項1記載の方法において、予測方向を少なくとも1つの第1スペクトル成分と少なくとも1つの第2スペクトル成分に対して、第1のチャネルと第2のチャネルの帰属関数として検出し、
該予測方向を受信器に伝送し、
復元ステップにおいて少なくとも1つの第2スペクトル成分を前記予測方向に基づき復元する冗長性低減方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE4318763 | 1993-06-05 | ||
DE4320990A DE4320990B4 (de) | 1993-06-05 | 1993-06-24 | Verfahren zur Redundanzreduktion |
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JP12390894A Division JP4095679B2 (ja) | 1993-06-05 | 1994-06-06 | 冗長性低減方法 |
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JP2008146081A JP2008146081A (ja) | 2008-06-26 |
JP4504414B2 true JP4504414B2 (ja) | 2010-07-14 |
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JP12390894A Expired - Fee Related JP4095679B2 (ja) | 1993-06-05 | 1994-06-06 | 冗長性低減方法 |
JP2007323655A Expired - Fee Related JP4504414B2 (ja) | 1993-06-05 | 2007-12-14 | 冗長性低減方法 |
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US (1) | US5511093A (ja) |
JP (2) | JP4095679B2 (ja) |
DE (1) | DE4320990B4 (ja) |
FR (1) | FR2706053B1 (ja) |
GB (1) | GB2279214B (ja) |
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DE4320990B4 (de) * | 1993-06-05 | 2004-04-29 | Robert Bosch Gmbh | Verfahren zur Redundanzreduktion |
DE19526366A1 (de) | 1995-07-20 | 1997-01-23 | Bosch Gmbh Robert | Verfahren zur Redundanzreduktion bei der Codierung von mehrkanaligen Signalen und Vorrichtung zur Dekodierung von redundanzreduzierten, mehrkanaligen Signalen |
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US5864813A (en) * | 1996-12-20 | 1999-01-26 | U S West, Inc. | Method, system and product for harmonic enhancement of encoded audio signals |
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US6463405B1 (en) | 1996-12-20 | 2002-10-08 | Eliot M. Case | Audiophile encoding of digital audio data using 2-bit polarity/magnitude indicator and 8-bit scale factor for each subband |
SE519552C2 (sv) * | 1998-09-30 | 2003-03-11 | Ericsson Telefon Ab L M | Flerkanalig signalkodning och -avkodning |
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US6751587B2 (en) * | 2002-01-04 | 2004-06-15 | Broadcom Corporation | Efficient excitation quantization in noise feedback coding with general noise shaping |
EP1500085B1 (en) | 2002-04-10 | 2013-02-20 | Koninklijke Philips Electronics N.V. | Coding of stereo signals |
BRPI0308691B1 (pt) * | 2002-04-10 | 2018-06-19 | Koninklijke Philips N.V. | “Métodos para codificar um sinal de canal múltiplo e para decodificar informação de sinal de canal múltiplo, e arranjos para codificar e decodificar um sinal de canal múltiplo” |
TWI498882B (zh) * | 2004-08-25 | 2015-09-01 | Dolby Lab Licensing Corp | 音訊解碼器 |
ATE545131T1 (de) * | 2004-12-27 | 2012-02-15 | Panasonic Corp | Tonkodierungsvorrichtung und tonkodierungsmethode |
EP1866911B1 (en) * | 2005-03-30 | 2010-06-09 | Koninklijke Philips Electronics N.V. | Scalable multi-channel audio coding |
JP5025485B2 (ja) * | 2005-10-31 | 2012-09-12 | パナソニック株式会社 | ステレオ符号化装置およびステレオ信号予測方法 |
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US20100121633A1 (en) * | 2007-04-20 | 2010-05-13 | Panasonic Corporation | Stereo audio encoding device and stereo audio encoding method |
GB2453117B (en) | 2007-09-25 | 2012-05-23 | Motorola Mobility Inc | Apparatus and method for encoding a multi channel audio signal |
US8374883B2 (en) | 2007-10-31 | 2013-02-12 | Panasonic Corporation | Encoder and decoder using inter channel prediction based on optimally determined signals |
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Citations (4)
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JPS6251844A (ja) * | 1985-08-30 | 1987-03-06 | Toshiba Corp | ステレオ信号伝送符号化・復号化方法、符号化装置および復号化装置 |
JPS62239631A (ja) * | 1986-04-10 | 1987-10-20 | Toshiba Corp | ステレオ音声伝送蓄積方式 |
JPH04506141A (ja) * | 1989-06-15 | 1992-10-22 | ブリテイッシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニー | ポリフォニックコーディング |
JP4095679B2 (ja) * | 1993-06-05 | 2008-06-04 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | 冗長性低減方法 |
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-
1993
- 1993-06-24 DE DE4320990A patent/DE4320990B4/de not_active Expired - Fee Related
-
1994
- 1994-05-04 US US08/238,107 patent/US5511093A/en not_active Expired - Lifetime
- 1994-05-26 GB GB9410528A patent/GB2279214B/en not_active Expired - Fee Related
- 1994-06-03 FR FR9406820A patent/FR2706053B1/fr not_active Expired - Fee Related
- 1994-06-06 JP JP12390894A patent/JP4095679B2/ja not_active Expired - Fee Related
-
2007
- 2007-12-14 JP JP2007323655A patent/JP4504414B2/ja not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6251844A (ja) * | 1985-08-30 | 1987-03-06 | Toshiba Corp | ステレオ信号伝送符号化・復号化方法、符号化装置および復号化装置 |
JPS62239631A (ja) * | 1986-04-10 | 1987-10-20 | Toshiba Corp | ステレオ音声伝送蓄積方式 |
JPH04506141A (ja) * | 1989-06-15 | 1992-10-22 | ブリテイッシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニー | ポリフォニックコーディング |
JP4095679B2 (ja) * | 1993-06-05 | 2008-06-04 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | 冗長性低減方法 |
Also Published As
Publication number | Publication date |
---|---|
FR2706053A1 (fr) | 1994-12-09 |
JP4095679B2 (ja) | 2008-06-04 |
JPH0723009A (ja) | 1995-01-24 |
DE4320990A1 (de) | 1995-01-05 |
FR2706053B1 (fr) | 1995-11-03 |
US5511093A (en) | 1996-04-23 |
GB2279214B (en) | 1997-12-10 |
DE4320990B4 (de) | 2004-04-29 |
GB2279214A (en) | 1994-12-21 |
GB9410528D0 (en) | 1994-07-13 |
JP2008146081A (ja) | 2008-06-26 |
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