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GB2451474B - word length reduction circuit - Google Patents

word length reduction circuit

Info

Publication number
GB2451474B
GB2451474B GB0714889.3A GB0714889A GB2451474B GB 2451474 B GB2451474 B GB 2451474B GB 0714889 A GB0714889 A GB 0714889A GB 2451474 B GB2451474 B GB 2451474B
Authority
GB
United Kingdom
Prior art keywords
word length
reduction circuit
length reduction
word
circuit
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
GB0714889.3A
Other versions
GB0714889D0 (en
GB2451474A (en
Inventor
John Paul Lesso
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cirrus Logic International UK Ltd
Original Assignee
Wolfson Microelectronics PLC
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 Wolfson Microelectronics PLC filed Critical Wolfson Microelectronics PLC
Priority to GB0714889.3A priority Critical patent/GB2451474B/en
Publication of GB0714889D0 publication Critical patent/GB0714889D0/en
Priority to PCT/GB2008/002156 priority patent/WO2009016337A1/en
Publication of GB2451474A publication Critical patent/GB2451474A/en
Application granted granted Critical
Publication of GB2451474B publication Critical patent/GB2451474B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3004—Digital delta-sigma modulation
    • H03M7/3006—Compensating for, or preventing of, undesired influence of physical parameters
    • H03M7/3008—Compensating for, or preventing of, undesired influence of physical parameters by averaging out the errors, e.g. using dither
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3004—Digital delta-sigma modulation
    • H03M7/3015—Structural details of digital delta-sigma modulators
    • H03M7/302—Structural details of digital delta-sigma modulators characterised by the number of quantisers and their type and resolution
    • H03M7/3024—Structural details of digital delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only
    • H03M7/3028—Structural details of digital delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only the quantiser being a single bit one
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3004—Digital delta-sigma modulation
    • H03M7/3015—Structural details of digital delta-sigma modulators
    • H03M7/3031—Structural details of digital delta-sigma modulators characterised by the order of the loop filter, e.g. having a first order loop filter in the feedforward path
    • H03M7/3042—Structural details of digital delta-sigma modulators characterised by the order of the loop filter, e.g. having a first order loop filter in the feedforward path the modulator being of the error feedback type, i.e. having loop filter stages in the feedback path only

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
GB0714889.3A 2007-07-31 2007-07-31 word length reduction circuit Active GB2451474B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0714889.3A GB2451474B (en) 2007-07-31 2007-07-31 word length reduction circuit
PCT/GB2008/002156 WO2009016337A1 (en) 2007-07-31 2008-06-24 Word length reduction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0714889.3A GB2451474B (en) 2007-07-31 2007-07-31 word length reduction circuit

Publications (3)

Publication Number Publication Date
GB0714889D0 GB0714889D0 (en) 2007-09-12
GB2451474A GB2451474A (en) 2009-02-04
GB2451474B true GB2451474B (en) 2012-03-28

Family

ID=38529038

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0714889.3A Active GB2451474B (en) 2007-07-31 2007-07-31 word length reduction circuit

Country Status (2)

Country Link
GB (1) GB2451474B (en)
WO (1) WO2009016337A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2579858B (en) 2018-12-18 2021-07-14 Mqa Ltd Discrete dither

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568846A1 (en) * 1992-05-06 1993-11-10 Sony Corporation Quantizing error reducer for audio signal
WO2000031879A1 (en) * 1998-11-20 2000-06-02 Infineon Technologies Ag Circuit configuration for quantisation of digital signals and for filtering quantisation noise
US20040239417A1 (en) * 2001-08-31 2004-12-02 Kowkutla Venkateswar R. Amplifiers

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9103777D0 (en) * 1991-02-22 1991-04-10 B & W Loudspeakers Analogue and digital convertors
GB9216659D0 (en) * 1992-08-05 1992-09-16 Gerzon Michael A Subtractively dithered digital waveform coding system
JP3396512B2 (en) * 1993-08-31 2003-04-14 パイオニア株式会社 Dither generator
US5602874A (en) * 1994-12-29 1997-02-11 Motorola, Inc. Method and apparatus for reducing quantization noise
US5977899A (en) * 1997-09-25 1999-11-02 Analog Devices, Inc. Digital-to-analog converter using noise-shaped segmentation
WO2002023731A2 (en) * 2000-09-11 2002-03-21 Broadcom Corporation Methods and systems for digital dither
US6888484B2 (en) * 2003-05-22 2005-05-03 Agere Systems Inc. Stable high-order delta-sigma error feedback modulators, and noise transfer functions for use in such modulators
GB2408858B (en) * 2003-12-05 2006-11-29 Wolfson Ltd Word length reduction circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568846A1 (en) * 1992-05-06 1993-11-10 Sony Corporation Quantizing error reducer for audio signal
WO2000031879A1 (en) * 1998-11-20 2000-06-02 Infineon Technologies Ag Circuit configuration for quantisation of digital signals and for filtering quantisation noise
US20040239417A1 (en) * 2001-08-31 2004-12-02 Kowkutla Venkateswar R. Amplifiers

Also Published As

Publication number Publication date
GB0714889D0 (en) 2007-09-12
GB2451474A (en) 2009-02-04
WO2009016337A1 (en) 2009-02-05

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20150820 AND 20150826