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WO1994003988A3 - Dithered digital signal processing system - Google Patents

Dithered digital signal processing system 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
French (fr)
Other versions
WO1994003988A2 (en
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/en
Publication of WO1994003988A3 publication Critical patent/WO1994003988A3/en

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

Abstract

Digital signal processing systems for converting a digital signal of a first resolution to a digital signal of a second different resolution include a generator for dither noise. The dither noise is used in such a way as to mask or reduce the effect of non-linearities in the system. The generator generates the dither noise for use in processing a current sample of a lower resolution signal in functional dependence upon previous samples of the lower resolution signal. In one sample, the dither noise generator is formed as a look-up table addressed by the least significant bits of the previous, e.g., 16 samples. The least significant bits of those samples are stored in a buffer. In a digital encoder which encodes a high resolution digital signal to produce a lower resolution signal, the dither noise output from the generator is added to the lower resolution signal at the input to a quantizer. In a complementary digital decoder, the output of a matching dither noise generator is subtracted from the lower resolution digital signal. The encoder and decoder may be combined in a transmission system which transmits a higher resolution signal via a lower resolution digital channel formed, e.g., by a digital storage medium such as a CD, DAT or other digital tape format.
PCT/GB1993/001644 1992-08-05 1993-08-04 Dithered digital signal processing system WO1994003988A2 (en)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=10719889

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/001644 WO1994003988A2 (en) 1992-08-05 1993-08-04 Dithered digital signal processing system

Country Status (2)

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

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
EP0691052B1 (en) * 1993-12-23 2002-10-30 Koninklijke Philips Electronics N.V. Method and apparatus for encoding multibit coded digital sound through subtracting adaptive dither, inserting buried channel bits and filtering, and encoding apparatus for use with this method
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
US8797193B2 (en) 2010-01-29 2014-08-05 Hewlett-Packard Development Company, L.P. Parallel test payload
US8810443B2 (en) * 2012-04-20 2014-08-19 Linear Technology Corporation Analog-to-digital converter system and method
CN105723711B (en) 2013-11-12 2019-05-07 杜比实验室特许公司 Method, device and storage medium for pre-dithering in high dynamic range video coding
US9450601B1 (en) 2015-04-02 2016-09-20 Microsoft Technology Licensing, Llc Continuous rounding of differing bit lengths
CN108496221B (en) 2016-01-26 2020-01-21 杜比实验室特许公司 Adaptive quantization

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 (en) * 1989-11-09 1991-05-15 The Grass Valley Group, Inc. Adaptive rounder for video signals

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 (en) * 1989-11-09 1991-05-15 The Grass Valley Group, Inc. Adaptive rounder for video signals

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
WO1994003988A2 (en) 1994-02-17
GB9216659D0 (en) 1992-09-16

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