JPH0793582B2 - シグマ−デルタ変調器 - Google Patents

シグマ−デルタ変調器

Info

Publication number
JPH0793582B2
JPH0793582B2 JP4151183A JP15118392A JPH0793582B2 JP H0793582 B2 JPH0793582 B2 JP H0793582B2 JP 4151183 A JP4151183 A JP 4151183A JP 15118392 A JP15118392 A JP 15118392A JP H0793582 B2 JPH0793582 B2 JP H0793582B2
Authority
JP
Japan
Prior art keywords
modulator
quantizer
dither
signal
noise
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.)
Expired - Lifetime
Application number
JP4151183A
Other languages
English (en)
Japanese (ja)
Other versions
JPH05160736A (ja
Inventor
ロバート ノースワーシー スティーヴン
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.)
AT&T Corp
Original Assignee
AT&T Corp
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 AT&T Corp filed Critical AT&T Corp
Publication of JPH05160736A publication Critical patent/JPH05160736A/ja
Publication of JPH0793582B2 publication Critical patent/JPH0793582B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/30—Delta-sigma modulation
    • H03M3/322—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M3/324—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by means or methods for compensating or preventing more than one type of error at a time, e.g. by synchronisation or using a ratiometric arrangement
    • H03M3/326—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by means or methods for compensating or preventing more than one type of error at a time, e.g. by synchronisation or using a ratiometric arrangement by averaging out the errors
    • H03M3/328—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by means or methods for compensating or preventing more than one type of error at a time, e.g. by synchronisation or using a ratiometric arrangement by averaging out the errors using dither
    • H03M3/33—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by means or methods for compensating or preventing more than one type of error at a time, e.g. by synchronisation or using a ratiometric arrangement by averaging out the errors using dither the dither being a random signal
    • H03M3/332—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by means or methods for compensating or preventing more than one type of error at a time, e.g. by synchronisation or using a ratiometric arrangement by averaging out the errors using dither the dither being a random signal in particular a pseudo-random signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/30—Delta-sigma modulation
    • H03M3/458—Analogue/digital converters using delta-sigma modulation as an intermediate step

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Analogue/Digital Conversion (AREA)
JP4151183A 1991-05-21 1992-05-20 シグマ−デルタ変調器 Expired - Lifetime JPH0793582B2 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/703,527 US5144308A (en) 1991-05-21 1991-05-21 Idle channel tone and periodic noise suppression for sigma-delta modulators using high-level dither
US703527 1991-05-21

Publications (2)

Publication Number Publication Date
JPH05160736A JPH05160736A (ja) 1993-06-25
JPH0793582B2 true JPH0793582B2 (ja) 1995-10-09

Family

ID=24825739

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4151183A Expired - Lifetime JPH0793582B2 (ja) 1991-05-21 1992-05-20 シグマ−デルタ変調器

Country Status (6)

Country Link
US (1) US5144308A (cg-RX-API-DMAC7.html)
EP (2) EP0709969B1 (cg-RX-API-DMAC7.html)
JP (1) JPH0793582B2 (cg-RX-API-DMAC7.html)
KR (1) KR950010212B1 (cg-RX-API-DMAC7.html)
DE (2) DE69215271T2 (cg-RX-API-DMAC7.html)
HK (1) HK42997A (cg-RX-API-DMAC7.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002247683A (ja) * 2001-02-02 2002-08-30 Techtronic As 内部ａ／ｄ変換器を備えたマイクロホン

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US5457456A (en) * 1993-12-16 1995-10-10 At&T Ipm Corp. Data converter with programmable decimation or interpolation factor
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US5530442A (en) * 1994-05-09 1996-06-25 At&T Corp. Circuit and method for testing a dithered analog-to-digital converter
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US6034855A (en) * 1997-05-30 2000-03-07 Lucent Technologies Inc. Method and apparatus for attenuation of, and damage protection from, high energy electromagnetic pulses
US5999114A (en) * 1997-07-03 1999-12-07 Lucent Technologies Inc. Dithered digital gain scalar/summer
US5905453A (en) * 1997-08-04 1999-05-18 Motorola, Inc. Dithered sigma delta modulator having programmable full scale range adjustment
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US5964708A (en) * 1997-10-06 1999-10-12 The Regents Of The University Of Michigan Beamformed ultrasonic imager with delta-sigma feedback control
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US6456223B1 (en) * 1999-12-28 2002-09-24 Texas Instruments Incorporated Pipelined analog to digital converter using digital mismatch noise cancellation
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US6404364B1 (en) 2000-08-24 2002-06-11 Agere Systems Guardian Corp. Multistage converter employing digital dither
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US6351229B1 (en) 2000-09-05 2002-02-26 Texas Instruments Incorporated Density-modulated dynamic dithering circuits and method for delta-sigma converter
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US7058463B1 (en) 2000-12-29 2006-06-06 Nokia Corporation Method and apparatus for implementing a class D driver and speaker system
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US6710729B1 (en) * 2002-10-10 2004-03-23 Faraday Technology Corp. Idle channel tone and periodic noise suppression for sigma-delta modulator using feedback-quantizer
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Citations (1)

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US5144308A (en) 1991-05-21 1992-09-01 At&T Bell Laboratories Idle channel tone and periodic noise suppression for sigma-delta modulators using high-level dither

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Publication number Priority date Publication date Assignee Title
JP2002247683A (ja) * 2001-02-02 2002-08-30 Techtronic As 内部ａ／ｄ変換器を備えたマイクロホン

Also Published As

Publication number Publication date
DE69215271D1 (de) 1997-01-02
EP0515154B1 (en) 1996-11-20
KR920022692A (ko) 1992-12-19
JPH05160736A (ja) 1993-06-25
EP0709969A2 (en) 1996-05-01
DE69231317D1 (de) 2000-09-07
KR950010212B1 (ko) 1995-09-11
DE69231317T2 (de) 2000-12-28
EP0709969A3 (cg-RX-API-DMAC7.html) 1996-05-08
DE69215271T2 (de) 1997-06-05
HK42997A (en) 1997-04-11
US5144308A (en) 1992-09-01
EP0709969B1 (en) 2000-08-02
EP0515154A1 (en) 1992-11-25

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