WO2004086616A3 - Clip detection in pwm amplifier - Google Patents

Clip detection in pwm amplifier Download PDF

Info

Publication number
WO2004086616A3
WO2004086616A3 PCT/US2004/008534 US2004008534W WO2004086616A3 WO 2004086616 A3 WO2004086616 A3 WO 2004086616A3 US 2004008534 W US2004008534 W US 2004008534W WO 2004086616 A3 WO2004086616 A3 WO 2004086616A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal processor
signal
detector
filter
noise shaper
Prior art date
Application number
PCT/US2004/008534
Other languages
French (fr)
Other versions
WO2004086616A2 (en
Inventor
Jack B Andersen
Larry E Hand
Wilson E Taylor
Original Assignee
D2Audio Corp
Jack B Andersen
Larry E Hand
Wilson E Taylor
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 D2Audio Corp, Jack B Andersen, Larry E Hand, Wilson E Taylor filed Critical D2Audio Corp
Priority to CN200480009689.9A priority Critical patent/CN1894855B/en
Priority to EP04757922A priority patent/EP1606884A2/en
Priority to JP2006507396A priority patent/JP4617298B2/en
Publication of WO2004086616A2 publication Critical patent/WO2004086616A2/en
Publication of WO2004086616A3 publication Critical patent/WO2004086616A3/en
Priority to HK07101872.4A priority patent/HK1094626A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/523—Circuit arrangements for protecting such amplifiers for amplifiers using field-effect devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H03F3/2171—Class D power amplifiers; Switching amplifiers with field-effect devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H03F3/2175—Class D power amplifiers; Switching amplifiers using analogue-digital or digital-analogue conversion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/002—Control of digital or coded signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/007—Volume compression or expansion in amplifiers of digital or coded signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
    • H04L7/005—Correction by an elastic buffer

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

Systems and methods for detecting clipping conditions in an audio signal and processing the signal to reduce the clipping conditions. In one embodiment, a system comprises a noise shaper, a modulator, an output stage and other components. A detector detects clipping in the noise shaper and a signal processor processes the audio signal input to the noise shaper based on feedback received from the detector. The signal processor may function to modify the input audio signal in different ways in response to different conditions that are detected by the detector. A filter may be included to filter tie output of the detector before being provided to the signal processor. A flag circuit may be coupled between the filter and the signal processor to assert an output signal until the signal processor resets the flag circuit.
PCT/US2004/008534 2003-03-21 2004-03-19 Clip detection in pwm amplifier WO2004086616A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN200480009689.9A CN1894855B (en) 2003-03-21 2004-03-19 System and method for detection of amplitude limit and modification of signal
EP04757922A EP1606884A2 (en) 2003-03-21 2004-03-19 Clip detection in pwm amplifier
JP2006507396A JP4617298B2 (en) 2003-03-21 2004-03-19 Clip detection and signal modulation system and method
HK07101872.4A HK1094626A1 (en) 2003-03-21 2007-02-15 Clip detection in pwm amplifier

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US45641403P 2003-03-21 2003-03-21
US60/456,414 2003-03-21
US46977003P 2003-05-12 2003-05-12
US60/469,770 2003-05-12

Publications (2)

Publication Number Publication Date
WO2004086616A2 WO2004086616A2 (en) 2004-10-07
WO2004086616A3 true WO2004086616A3 (en) 2004-11-25

Family

ID=33101242

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/008534 WO2004086616A2 (en) 2003-03-21 2004-03-19 Clip detection in pwm amplifier

Country Status (5)

Country Link
EP (1) EP1606884A2 (en)
JP (1) JP4617298B2 (en)
CN (1) CN1894855B (en)
HK (1) HK1094626A1 (en)
WO (1) WO2004086616A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4618017B2 (en) * 2004-07-02 2011-01-26 ヤマハ株式会社 Clip suppression circuit for pulse width modulation amplifier
US7286010B2 (en) 2006-01-26 2007-10-23 D2Audio Corporation Systems and methods for over-current protection
JP5266830B2 (en) * 2008-03-26 2013-08-21 ヤマハ株式会社 Self-excited class D amplifier
CN103955784B (en) * 2014-04-01 2016-09-14 南京航空航天大学 Manufacturing shop based on data acquisition coprocessor personal electric banner system
EP3281293B1 (en) 2015-04-09 2019-02-13 Icepower A/S Duty cycle clipper
CN107221335B (en) * 2017-05-27 2020-07-14 大连理工大学 Digitization device and method for monitoring audio signal
CN109766889B (en) * 2018-11-19 2021-04-09 浙江众合科技股份有限公司 Rail image recognition post-processing method based on curve fitting

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001026222A1 (en) * 1999-10-01 2001-04-12 Smith Carroll W Dynamic closed-loop audio amplifier system
EP1128549A2 (en) * 2000-02-17 2001-08-29 Visteon Global Technologies, Inc. Detection of a DC offset in an automotive audio system
US20020085725A1 (en) * 1999-11-29 2002-07-04 Bizjak Karl M. System output control method and apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3047420B2 (en) * 1990-03-15 2000-05-29 ソニー株式会社 Data compression encoder
JP3121987B2 (en) * 1994-05-11 2001-01-09 シャープ株式会社 Speaker drive
JP3214981B2 (en) * 1994-06-30 2001-10-02 旭化成マイクロシステム株式会社 Delta-sigma A / D converter with AGC function
JP2000022544A (en) * 1998-07-01 2000-01-21 Mitsubishi Electric Corp Da conversion device
US6157331A (en) * 1998-10-01 2000-12-05 Tritech Microelectronics, Ltd. Sigma delta modulator with automatic saturation detection and recovery
US6122331A (en) * 1999-06-14 2000-09-19 Atmel Corporation Digital automatic gain control
JP4251769B2 (en) * 2000-11-15 2009-04-08 ヤマハ株式会社 Digital audio amplifier
JP3815607B2 (en) * 2001-11-16 2006-08-30 横河電機株式会社 Temperature transmitter using analog-digital converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001026222A1 (en) * 1999-10-01 2001-04-12 Smith Carroll W Dynamic closed-loop audio amplifier system
US20020085725A1 (en) * 1999-11-29 2002-07-04 Bizjak Karl M. System output control method and apparatus
EP1128549A2 (en) * 2000-02-17 2001-08-29 Visteon Global Technologies, Inc. Detection of a DC offset in an automotive audio system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DUNN C ET AL: "Use of Clipping in Sigma-Delta Modulators", IEE COLLOQUIUM ON OVERSAMPLING TECHNIQUES AND SIGMA-DELTA MODULATION, 30 March 1994 (1994-03-30), pages 8/1 - 8/9, XP002295447 *
MEIER W ET AL: "SOFTWARE AMPLITUDE LIMITATION IN DIGITAL SIGNAL PROCESSING APPLICATIONS", MOTOROLA TECHNICAL DEVELOPMENTS, MOTOROLA INC. SCHAUMBURG, ILLINOIS, US, vol. 25, 1 July 1995 (1995-07-01), pages 23 - 27, XP000524322, ISSN: 0887-5286 *

Also Published As

Publication number Publication date
JP2006523414A (en) 2006-10-12
WO2004086616A2 (en) 2004-10-07
CN1894855A (en) 2007-01-10
EP1606884A2 (en) 2005-12-21
JP4617298B2 (en) 2011-01-19
HK1094626A1 (en) 2007-04-04
CN1894855B (en) 2011-06-15

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