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WO1994003988A3 - Systeme de traitement de signaux numeriques de superposition - Google Patents

Systeme de traitement de signaux numeriques de superposition Download PDF

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Publication number
WO1994003988A3
WO1994003988A3 PCT/GB1993/001644 GB9301644W WO9403988A3 WO 1994003988 A3 WO1994003988 A3 WO 1994003988A3 GB 9301644 W GB9301644 W GB 9301644W WO 9403988 A3 WO9403988 A3 WO 9403988A3
Authority
WO
WIPO (PCT)
Prior art keywords
digital
signal
lower resolution
dither noise
digital signal
Prior art date
Application number
PCT/GB1993/001644
Other languages
English (en)
Other versions
WO1994003988A2 (fr
Inventor
Michael Anthony Gerzon
Peter Graham Craven
Original Assignee
Michael Anthony Gerzon
Peter Graham Craven
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Michael Anthony Gerzon, Peter Graham Craven filed Critical Michael Anthony Gerzon
Publication of WO1994003988A2 publication Critical patent/WO1994003988A2/fr
Publication of WO1994003988A3 publication Critical patent/WO1994003988A3/fr

Links

Classifications

    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Analogue/Digital Conversion (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

L'invention se rapporte à des systèmes de traitement de signaux numériques conçus pour convertir un signal numérique d'une première résolution en un signal numérique d'une seconde résolution différente et comprenant un générateur de bruit de superposition 'dither noise'. Le bruit de superposition est utilisé de façon à masquer ou à réduire l'effet des non-linéarités du système. Le générateur génère le bruit de superposition que l'on utilise dans le traitement d'un échantillon d'un signal à faible résolution en fonction d'échantillons antérieurs du signal de faible résolution. Par exemple, le générateur de bruit de superposition se présente sous la forme d'une table de consultation adressée par les bits de poids faible de, par ex., 16 échantillons antérieurs. Les bits de poids faible de ces échantillons sont stockés dans une mémoire tampon. Dans un codeur numérique qui code un signal numérique à haute résolution pour produire un signal numérique à faible résolution, la sortie du bruit de superposition du générateur est ajoutée au signal de faible résolution à l'entrée d'un quantificateur. Dans un décodeur numérique complémentaire, la sortie d'un générateur de bruit de superposition correspondant est soustraite du signal numérique à faible résolution. Le codeur et le décodeur peuvent être combinés dans un système de transmission qui émet un signal à haute résolution par l'intermédiaire d'un canal numérique à faible résolution produit, par ex., par un support d'information numérique tel qu'un disque compact, une bande audionumérique ou autre format de bande numérique.
PCT/GB1993/001644 1992-08-05 1993-08-04 Systeme de traitement de signaux numeriques de superposition WO1994003988A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9216659.4 1992-08-05
GB929216659A GB9216659D0 (en) 1992-08-05 1992-08-05 Subtractively dithered digital waveform coding system

Publications (2)

Publication Number Publication Date
WO1994003988A2 WO1994003988A2 (fr) 1994-02-17
WO1994003988A3 true WO1994003988A3 (fr) 1994-03-31

Family

ID=10719889

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/001644 WO1994003988A2 (fr) 1992-08-05 1993-08-04 Systeme de traitement de signaux numeriques de superposition

Country Status (2)

Country Link
GB (1) GB9216659D0 (fr)
WO (1) WO1994003988A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8849658B2 (en) 2009-01-06 2014-09-30 Skype Speech encoding utilizing independent manipulation of signal and noise spectrum
US9263051B2 (en) 2009-01-06 2016-02-16 Skype Speech coding by quantizing with random-noise signal
US9530423B2 (en) 2009-01-06 2016-12-27 Skype Speech encoding by determining a quantization gain based on inverse of a pitch correlation
US9571856B2 (en) 2008-08-25 2017-02-14 Microsoft Technology Licensing, Llc Conversion operations in scalable video encoding and decoding

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3782103B2 (ja) * 1993-12-23 2006-06-07 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ アダプティブディザを減算し、埋没チャンネルビットを挿入し、フィルタリングすることによりマルチビット符号ディジタル音声を符号化する方法及び装置、及びこの方法のための符号化及び復号化装置。
US8711925B2 (en) 2006-05-05 2014-04-29 Microsoft Corporation Flexible quantization
GB2451474B (en) * 2007-07-31 2012-03-28 Wolfson Microelectronics Plc word length reduction circuit
US8750390B2 (en) 2008-01-10 2014-06-10 Microsoft Corporation Filtering and dithering as pre-processing before encoding
US8160132B2 (en) 2008-02-15 2012-04-17 Microsoft Corporation Reducing key picture popping effects in video
US8897359B2 (en) 2008-06-03 2014-11-25 Microsoft Corporation Adaptive quantization for enhancement layer video coding
GB2466674B (en) 2009-01-06 2013-11-13 Skype Speech coding
WO2011093870A1 (fr) * 2010-01-29 2011-08-04 Hewlett Packard Development Company, L.P. Charge utile d'essai parallèle
US8810443B2 (en) * 2012-04-20 2014-08-19 Linear Technology Corporation Analog-to-digital converter system and method
EP3069513B1 (fr) 2013-11-12 2019-03-13 Dolby Laboratories Licensing Corporation Pré-juxtaposition en codage vidéo à dynamique élevée
US9450601B1 (en) 2015-04-02 2016-09-20 Microsoft Technology Licensing, Llc Continuous rounding of differing bit lengths
WO2017132366A1 (fr) 2016-01-26 2017-08-03 Dolby Laboratories Licensing Corporation Quantification adaptative

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4377821A (en) * 1981-09-24 1983-03-22 Bell Telephone Laboratories, Incorporated Arrangement for providing a flickerless ordered dither image for a video display
EP0427524A1 (fr) * 1989-11-09 1991-05-15 The Grass Valley Group, Inc. Dispositif pour arrondir adaptivement le signal vidéo

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4377821A (en) * 1981-09-24 1983-03-22 Bell Telephone Laboratories, Incorporated Arrangement for providing a flickerless ordered dither image for a video display
EP0427524A1 (fr) * 1989-11-09 1991-05-15 The Grass Valley Group, Inc. Dispositif pour arrondir adaptivement le signal vidéo

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
INTERNATIONAL CONFERENCE ON COMMUNICATIONS OF THE INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS June 1975, SAN FRANCISCO pages 27.26 - 27.30 J.W. MARK 'A dithered adaptative predictive coding scheme for compression of analogue sources' *
LIPSHITZ S P, WANNAMAKER R A, VANDERKOOY J: "QUANTIZATION AND DITHER: A THEORETICAL SURVEY", JOURNAL OF THE AUDIO ENGINEERING SOCIETY., AUDIO ENGINEERING SOCIETY, NEW YORK, NY., US, vol. 40, no. 05, 1 May 1992 (1992-05-01), US, pages 355 - 375, XP000275656, ISSN: 1549-4950 *
PREPRINT 2822 OF THE 87TH AUDIO ENGINEERING SOCIETY CONVENTION October 1989, NEW YORK, US M.A. GERZON , P.G. CRAVEN 'Optimal noise shaping and dither of digital signals' cited in the application *
PREPRINT 3334 OF THE 92ND AUDIO ENGINEERING SOCIETY March 1992, VIENNA J.R. STUART, R.J. WILSON 'A search for efficient dither for DSP applications' *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9571856B2 (en) 2008-08-25 2017-02-14 Microsoft Technology Licensing, Llc Conversion operations in scalable video encoding and decoding
US8849658B2 (en) 2009-01-06 2014-09-30 Skype Speech encoding utilizing independent manipulation of signal and noise spectrum
US9263051B2 (en) 2009-01-06 2016-02-16 Skype Speech coding by quantizing with random-noise signal
US9530423B2 (en) 2009-01-06 2016-12-27 Skype Speech encoding by determining a quantization gain based on inverse of a pitch correlation

Also Published As

Publication number Publication date
GB9216659D0 (en) 1992-09-16
WO1994003988A2 (fr) 1994-02-17

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