GB2556234A - Magnitude compensation technique for processing single-bit wide data - Google Patents

Magnitude compensation technique for processing single-bit wide data

Info

Publication number
GB2556234A
GB2556234A GB1721507.0A GB201721507A GB2556234A GB 2556234 A GB2556234 A GB 2556234A GB 201721507 A GB201721507 A GB 201721507A GB 2556234 A GB2556234 A GB 2556234A
Authority
GB
United Kingdom
Prior art keywords
filter
bit wide
wide data
filtering
bit
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.)
Granted
Application number
GB1721507.0A
Other versions
GB2556234B (en
GB201721507D0 (en
Inventor
A Hester Dylan
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 Semiconductor Ltd
Original Assignee
Cirrus Logic International Semiconductor Ltd
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 Cirrus Logic International Semiconductor Ltd filed Critical Cirrus Logic International Semiconductor Ltd
Publication of GB201721507D0 publication Critical patent/GB201721507D0/en
Publication of GB2556234A publication Critical patent/GB2556234A/en
Application granted granted Critical
Publication of GB2556234B publication Critical patent/GB2556234B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/06—Non-recursive filters
    • 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
    • H03M1/0626—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 by filtering
    • 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
    • G10L19/04—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 predictive techniques
    • G10L19/16—Vocoder architecture
    • G10L19/167—Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
    • 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
    • G10L19/04—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 predictive techniques
    • G10L19/26—Pre-filtering or post-filtering
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0219—Compensation of undesirable effects, e.g. quantisation noise, overflow

Abstract

Droop caused by a filter may be compensated by applying a pre-filter to the audio signal that cancels out, at least in part, the droop caused by the filter. The pre-filter may implement magnitude compensation that causes an approximately flat passband response when the pre-filtered signal is passed through the filter. The pre-filter may be applied to one-bit wide data streams, such as high-fidelity direct stream digital (DSD) audio data or other one-bit wide data such as pulse-density modulation (PDM) encoded data. The pre-filtering and filtering may be implemented in components of an audio processor, such as in a digital-to-analog converter (DAC). The pre-filtering may include upsampling the one-bit wide data to form symbols and substituting an eighth bit of the symbol with an inverted version of an earlier-received bit.
GB1721507.0A 2016-04-14 2016-06-21 Magnitude compensation technique for processing single-bit wide data Active GB2556234B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15/099,319 US10200053B2 (en) 2016-04-14 2016-04-14 Magnitude compensation technique for processing single-bit wide data
PCT/US2016/038545 WO2017180172A1 (en) 2016-04-14 2016-06-21 Magnitude compensation technique for processing single-bit wide data

Publications (3)

Publication Number Publication Date
GB201721507D0 GB201721507D0 (en) 2018-01-31
GB2556234A true GB2556234A (en) 2018-05-23
GB2556234B GB2556234B (en) 2021-12-22

Family

ID=56551528

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1721507.0A Active GB2556234B (en) 2016-04-14 2016-06-21 Magnitude compensation technique for processing single-bit wide data

Country Status (3)

Country Link
US (1) US10200053B2 (en)
GB (1) GB2556234B (en)
WO (1) WO2017180172A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10418044B2 (en) * 2017-01-30 2019-09-17 Cirrus Logic, Inc. Converting a single-bit audio stream to a single-bit audio stream with a constant edge rate
CN109150187A (en) * 2018-08-02 2019-01-04 南京理工大学 A kind of D/A converting circuit based on multiple bit digital signal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6011501A (en) * 1998-12-31 2000-01-04 Cirrus Logic, Inc. Circuits, systems and methods for processing data in a one-bit format
US6340940B1 (en) * 2000-07-18 2002-01-22 Cirrus Logic, Inc. Digital to analog conversion circuits and methods utilizing single-bit delta-SIGMA modulators and multiple-bit digital to analog converters
US20040070528A1 (en) * 2002-06-27 2004-04-15 Keehr Edward A. Filtering applicable to digital to analog converter systems

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US5034742A (en) * 1990-06-19 1991-07-23 The United States Of America As Represented By The Secretary Of The Navy Message compression encoder and encoding method for a communication channel
US5751615A (en) * 1995-11-14 1998-05-12 Advanced Micro Devices, Inc. Implementation of a digital decimation filter and method
US6215431B1 (en) * 1999-06-01 2001-04-10 Lsi Logic Corporation Droop-free quasi-continuous reconstruction filter interface
KR100396607B1 (en) * 2000-10-28 2003-09-02 주식회사 아모텍 Circuit for Compensating Passband Flatness
EP1255386B1 (en) * 2001-12-05 2007-10-24 Agilent Technologies, Inc. Line equaliser for compensation of droop effect
US7031395B2 (en) * 2002-03-29 2006-04-18 Northrop Grumman Corporation Apparatus and methods for digital-to-analog conversion
US6727832B1 (en) * 2002-11-27 2004-04-27 Cirrus Logic, Inc. Data converters with digitally filtered pulse width modulation output stages and methods and systems using the same
US7277035B1 (en) * 2005-10-24 2007-10-02 Cirrus Logic, Inc. Method and apparatus for reducing noise in a digital-to-analog converter (DAC) having a chopper output stage
US7855665B1 (en) * 2007-04-27 2010-12-21 Marvell International Ltd. Enumerative DC-RLL constrained coding
US8645441B2 (en) * 2007-08-01 2014-02-04 Pentomics, Inc. Desensitized filters
KR20090110669A (en) * 2008-04-18 2009-10-22 주식회사 에이디알에프코리아 Circuit for Compensating Passband Flatness, Apparatus and Method for Compensating Passband Flatness
US8645445B2 (en) * 2008-11-06 2014-02-04 St-Ericsson Sa Filter block for compensating droop in a frequency response of a signal
DE112014006818B4 (en) * 2014-07-17 2021-11-04 Lattice Semiconductor Corporation Frequency response compensation in a digital-to-analog converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6011501A (en) * 1998-12-31 2000-01-04 Cirrus Logic, Inc. Circuits, systems and methods for processing data in a one-bit format
US6340940B1 (en) * 2000-07-18 2002-01-22 Cirrus Logic, Inc. Digital to analog conversion circuits and methods utilizing single-bit delta-SIGMA modulators and multiple-bit digital to analog converters
US20040070528A1 (en) * 2002-06-27 2004-04-15 Keehr Edward A. Filtering applicable to digital to analog converter systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Ken Yang, "Flatten DAC frequency response", (2006-05-13), pages 65 - 74, URL: http://www.hit.bme.hu/~papay/edu/Conv/pdf/FlatResponse.pdf, (2016-12-13), XP055328760 *

Also Published As

Publication number Publication date
WO2017180172A1 (en) 2017-10-19
US10200053B2 (en) 2019-02-05
US20170301360A1 (en) 2017-10-19
GB2556234B (en) 2021-12-22
GB201721507D0 (en) 2018-01-31

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