WO2005009072A3 - Microphone comprising integral multi-level quantizer and single-bit conversion means - Google Patents

Microphone comprising integral multi-level quantizer and single-bit conversion means Download PDF

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Publication number
WO2005009072A3
WO2005009072A3 PCT/DK2004/000680 DK2004000680W WO2005009072A3 WO 2005009072 A3 WO2005009072 A3 WO 2005009072A3 DK 2004000680 W DK2004000680 W DK 2004000680W WO 2005009072 A3 WO2005009072 A3 WO 2005009072A3
Authority
WO
WIPO (PCT)
Prior art keywords
digital
microphone
converter
level quantizer
conversion means
Prior art date
Application number
PCT/DK2004/000680
Other languages
French (fr)
Other versions
WO2005009072A2 (en
Inventor
Jens Kristian Poulsen
Original Assignee
Sonion As
Jens Kristian Poulsen
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 Sonion As, Jens Kristian Poulsen filed Critical Sonion As
Priority to US10/580,505 priority Critical patent/US7630504B2/en
Priority to AT04762899T priority patent/ATE495625T1/en
Priority to EP04762899A priority patent/EP1690437B1/en
Priority to CN2004800332228A priority patent/CN1879446B/en
Priority to DE602004031044T priority patent/DE602004031044D1/en
Publication of WO2005009072A2 publication Critical patent/WO2005009072A2/en
Publication of WO2005009072A3 publication Critical patent/WO2005009072A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/04—Structural association of microphone with electric circuitry therefor
    • 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
    • H03M7/3033—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 having a higher order loop filter in the feedforward path, e.g. with distributed feedforward inputs
    • H03M7/3035—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 having a higher order loop filter in the feedforward path, e.g. with distributed feedforward inputs with provisions for rendering the modulator inherently stable, e.g. by restricting the swing within the loop, by removing part of the zeroes using local feedback loops, by positioning zeroes outside the unit circle causing the modulator to operate in a chaotic regime
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

The invention relates to a digital microphone comprising an integral analog-to-digital converter based on a multi-level quantizer in cascade with a digital signal converter which is adapted to provide a single-bit output signal. Preferably, the analog-to-digital converter is a multi-bit delta-sigma A/D converter. Digital microphones in accordance with the invention are particularly well adapted for use in mobile terminals and compact portable communication equipment such as mobile or cellular phones, headsets, hearing prostheses etc.
PCT/DK2004/000680 2003-11-24 2004-10-08 Microphone comprising integral multi-level quantizer and single-bit conversion means WO2005009072A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US10/580,505 US7630504B2 (en) 2003-11-24 2004-10-08 Microphone comprising integral multi-level quantizer and single-bit conversion means
AT04762899T ATE495625T1 (en) 2003-11-24 2004-10-08 MICROPHONE WITH AN INTEGRAL MULTI-LEVEL QUANTIZER AND SINGLE-BIT CONVERTER
EP04762899A EP1690437B1 (en) 2003-11-24 2004-10-08 Microphone comprising integral multi-level quantizer and single-bit conversion means
CN2004800332228A CN1879446B (en) 2003-11-24 2004-10-08 Microphone comprising integral multi-level quantizer and single-bit conversion means
DE602004031044T DE602004031044D1 (en) 2003-11-24 2004-10-08 MICROPHONE WITH AN INTEGRAL MULTIPLE LEVEL QUANTIZER AND BIT IMPROVERS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52503903P 2003-11-24 2003-11-24
US60/525,039 2003-11-24

Publications (2)

Publication Number Publication Date
WO2005009072A2 WO2005009072A2 (en) 2005-01-27
WO2005009072A3 true WO2005009072A3 (en) 2005-03-24

Family

ID=34079506

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2004/000680 WO2005009072A2 (en) 2003-11-24 2004-10-08 Microphone comprising integral multi-level quantizer and single-bit conversion means

Country Status (6)

Country Link
US (1) US7630504B2 (en)
EP (1) EP1690437B1 (en)
CN (1) CN1879446B (en)
AT (1) ATE495625T1 (en)
DE (1) DE602004031044D1 (en)
WO (1) WO2005009072A2 (en)

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Also Published As

Publication number Publication date
WO2005009072A2 (en) 2005-01-27
CN1879446B (en) 2011-02-16
EP1690437A2 (en) 2006-08-16
CN1879446A (en) 2006-12-13
US20070127761A1 (en) 2007-06-07
DE602004031044D1 (en) 2011-02-24
ATE495625T1 (en) 2011-01-15
EP1690437B1 (en) 2011-01-12
US7630504B2 (en) 2009-12-08

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