WO2002047435A3 - Hearing aid digital automatic gain control - Google Patents

Hearing aid digital automatic gain control Download PDF

Info

Publication number
WO2002047435A3
WO2002047435A3 PCT/US2001/046476 US0146476W WO0247435A3 WO 2002047435 A3 WO2002047435 A3 WO 2002047435A3 US 0146476 W US0146476 W US 0146476W WO 0247435 A3 WO0247435 A3 WO 0247435A3
Authority
WO
WIPO (PCT)
Prior art keywords
input signal
hearing aid
gain
processor
gain control
Prior art date
Application number
PCT/US2001/046476
Other languages
French (fr)
Other versions
WO2002047435A2 (en
Inventor
Jon Schmidt Kindred
Bryant Sorensen
Jerry Wahl
Gary Richardson
Original Assignee
Starkey Lab Inc
Jon Schmidt Kindred
Bryant Sorensen
Jerry Wahl
Gary Richardson
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 Starkey Lab Inc, Jon Schmidt Kindred, Bryant Sorensen, Jerry Wahl, Gary Richardson filed Critical Starkey Lab Inc
Priority to EP01992008A priority Critical patent/EP1433358A2/en
Priority to CA002430777A priority patent/CA2430777A1/en
Priority to AU2002232485A priority patent/AU2002232485A1/en
Priority to US10/041,698 priority patent/US7139403B2/en
Publication of WO2002047435A2 publication Critical patent/WO2002047435A2/en
Publication of WO2002047435A3 publication Critical patent/WO2002047435A3/en
Priority to US11/456,777 priority patent/US8009842B2/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/04—Modifications of control circuit to reduce distortion caused by control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
    • H03G7/08—Volume compression or expansion in amplifiers having semiconductor devices incorporating negative feedback
    • 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
    • H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • H04R25/356—Amplitude, e.g. amplitude shift or compression
    • 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)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

Systems, devices, and methods are provided to inhibit apparent amplitude modulation in non-linear processing that causes distortion in a processed signal. One aspect of the invention includes a hearing aid. The hearing aid includes a microphone to receive an input signal, a speaker to reproduce the input signal, and a processor. The processor processes the input signal using a gain. The processor includes an inhibitor, which inhibits distortions, and an adjuster, which adjusts the gain. The inhibitor acts to smooth en envelope of the input signal to inhibit undesired modulation. The adjuster adjusts the gain if the envelope is either above or below a threshold. The hearing aid further includes a compression recapture system to supply the compressed portion of the input signal to more closely reproduce the actual input signal.
PCT/US2001/046476 2000-12-05 2001-12-05 Hearing aid digital automatic gain control WO2002047435A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP01992008A EP1433358A2 (en) 2000-12-05 2001-12-05 Hearing aid digital automatic gain control
CA002430777A CA2430777A1 (en) 2000-12-05 2001-12-05 Hearing aid digital automatic gain control
AU2002232485A AU2002232485A1 (en) 2000-12-05 2001-12-05 Hearing aid digital automatic gain control
US10/041,698 US7139403B2 (en) 2000-12-05 2002-01-08 Hearing aid with digital compression recapture
US11/456,777 US8009842B2 (en) 2000-12-05 2006-07-11 Hearing aid with digital compression recapture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/730,200 2000-12-05
US09/730,200 US7489790B2 (en) 2000-12-05 2000-12-05 Digital automatic gain control

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09/730,200 Continuation-In-Part US7489790B2 (en) 2000-12-05 2000-12-05 Digital automatic gain control

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/041,698 Continuation US7139403B2 (en) 2000-12-05 2002-01-08 Hearing aid with digital compression recapture

Publications (2)

Publication Number Publication Date
WO2002047435A2 WO2002047435A2 (en) 2002-06-13
WO2002047435A3 true WO2002047435A3 (en) 2004-01-08

Family

ID=24934362

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/046476 WO2002047435A2 (en) 2000-12-05 2001-12-05 Hearing aid digital automatic gain control

Country Status (5)

Country Link
US (5) US7489790B2 (en)
EP (1) EP1433358A2 (en)
AU (1) AU2002232485A1 (en)
CA (1) CA2430777A1 (en)
WO (1) WO2002047435A2 (en)

Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7489790B2 (en) * 2000-12-05 2009-02-10 Ami Semiconductor, Inc. Digital automatic gain control
WO2005041618A1 (en) * 2003-10-24 2005-05-06 Koninklijke Philips Electronics N.V. Adaptive sound reproduction
US8023673B2 (en) 2004-09-28 2011-09-20 Hearworks Pty. Limited Pitch perception in an auditory prosthesis
US7561709B2 (en) * 2003-12-31 2009-07-14 Hearworks Pty Limited Modulation depth enhancement for tone perception
AU2004242561B2 (en) * 2003-12-31 2011-05-12 Hearworks Pty Ltd Modulation Depth Enhancement for Tone Perception
US20060056645A1 (en) * 2004-09-01 2006-03-16 Wallis David E Construction of certain continuous signals from digital samples of a given signal
US7460848B1 (en) * 2004-09-29 2008-12-02 Xilinx, Inc. Differential signal strength detector
CA2693409C (en) * 2007-07-13 2016-06-07 Med-El Elektromedizinische Geraete Gmbh Electrical nerve stimulation with broad band low frequency filter
US8238583B2 (en) * 2007-11-28 2012-08-07 Fortemedia, Inc. Microphone circuit and method for analog-to-digital conversion therein
IL187930A0 (en) * 2007-12-06 2008-11-03 Moshe Kelly Appartus for imparating hearing ability to babies and others
US20090175468A1 (en) * 2008-01-09 2009-07-09 Mediatek Inc. Methods for preventing unwanted sound caused by gain changes
WO2009094390A2 (en) 2008-01-21 2009-07-30 Otologics, Llc Automatic gain control for implanted microphone
WO2009095331A1 (en) * 2008-01-29 2009-08-06 Audioasics A/S Signal conditioner with suppression of interfering signals
WO2009126680A1 (en) * 2008-04-08 2009-10-15 Med-El Elektromedizinische Geraete Gmbh Electrical stimulation of the acoustic nerve with coherent fine structure
US20110075861A1 (en) * 2008-06-12 2011-03-31 Zoran Corporation Method and Apparatus for Controlling Audio Input Amplitude
US8767987B2 (en) * 2008-08-12 2014-07-01 Intricon Corporation Ear contact pressure wave hearing aid switch
EP3585074A1 (en) 2008-08-12 2019-12-25 Intricon Corporation A switch for a hearing aid
US8771204B2 (en) 2008-12-30 2014-07-08 Masimo Corporation Acoustic sensor assembly
DE102009014540A1 (en) * 2009-03-24 2010-10-07 Siemens Medical Instruments Pte. Ltd. Method for operating a hearing device with increased feedback compensation and hearing device
WO2011047213A1 (en) * 2009-10-15 2011-04-21 Masimo Corporation Acoustic respiratory monitoring systems and methods
WO2011047216A2 (en) 2009-10-15 2011-04-21 Masimo Corporation Physiological acoustic monitoring system
US8715206B2 (en) 2009-10-15 2014-05-06 Masimo Corporation Acoustic patient sensor
US8821415B2 (en) * 2009-10-15 2014-09-02 Masimo Corporation Physiological acoustic monitoring system
US8790268B2 (en) 2009-10-15 2014-07-29 Masimo Corporation Bidirectional physiological information display
US9326712B1 (en) 2010-06-02 2016-05-03 Masimo Corporation Opticoustic sensor
WO2012112383A1 (en) 2011-02-14 2012-08-23 Med-Elektromedizinische Geraete Gmbh Enhancing fine time structure transmission for hearing implant system
TW201236365A (en) * 2011-02-25 2012-09-01 Novatek Microelectronics Corp Method and device of automatic gain control
DK2560410T3 (en) 2011-08-15 2019-09-16 Oticon As CHECK OUTPUT MODULE IN A HEARING INSTRUMENT
EP3603502B1 (en) 2011-10-13 2023-10-04 Masimo Corporation Physiological acoustic monitoring system
US9331649B2 (en) 2012-01-27 2016-05-03 Cochlear Limited Feature-based level control
US8767988B2 (en) * 2012-04-26 2014-07-01 Institute of Microelectronics, Chinese Academy of Sciences Analogic front circuit for medical device
US9955937B2 (en) 2012-09-20 2018-05-01 Masimo Corporation Acoustic patient sensor coupler
US9325286B1 (en) * 2013-04-08 2016-04-26 Amazon Technologies, Inc. Audio clipping prevention
US10828007B1 (en) 2013-10-11 2020-11-10 Masimo Corporation Acoustic sensor with attachment portion
US9432756B2 (en) 2014-01-03 2016-08-30 Blackberry Limited Feedback enclosure and feedback system for a transducer of an electronic device
US9641158B2 (en) 2015-08-20 2017-05-02 Apple Inc. Low power decimator
US10499150B2 (en) 2016-07-05 2019-12-03 Knowles Electronics, Llc Microphone assembly with digital feedback loop
CN107342750B (en) * 2017-07-04 2020-04-17 电子科技大学 Fractional delay optimization method suitable for multiple Nyquist zones and implementation structure thereof
US10505509B2 (en) 2017-10-31 2019-12-10 Cisco Technology, Inc. Process and temperature insensitive linear circuit
US11249499B2 (en) 2020-03-04 2022-02-15 Cisco Technology, Inc. Linear transimpedance amplifier dual regulator architecture and tuning

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071695A (en) * 1976-08-12 1978-01-31 Bell Telephone Laboratories, Incorporated Speech signal amplitude equalizer
US4410764A (en) * 1981-06-29 1983-10-18 Rockwell International Corporation Speech processor for processing analog signals
US5528696A (en) * 1993-09-27 1996-06-18 Viennatone Gesellschaft M.B.H. Hearing aid
US5633937A (en) * 1991-11-13 1997-05-27 Viennatone Ag Method for processing signals
US6104822A (en) * 1995-10-10 2000-08-15 Audiologic, Inc. Digital signal processing hearing aid

Family Cites Families (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484556A (en) 1966-11-01 1969-12-16 Bell Telephone Labor Inc Bandwidth compression eliminating frequency transposition and overcoming phase ambiguity
US3527901A (en) * 1967-03-28 1970-09-08 Dahlberg Electronics Hearing aid having resilient housing
US4052568A (en) * 1976-04-23 1977-10-04 Communications Satellite Corporation Digital voice switch
US4637402A (en) * 1980-04-28 1987-01-20 Adelman Roger A Method for quantitatively measuring a hearing defect
US4419544A (en) * 1982-04-26 1983-12-06 Adelman Roger A Signal processing apparatus
US4366349A (en) * 1980-04-28 1982-12-28 Adelman Roger A Generalized signal processing hearing aid
US4396806B2 (en) * 1980-10-20 1998-06-02 A & L Ventures I Hearing aid amplifier
US4471490A (en) * 1983-02-16 1984-09-11 Gaspare Bellafiore Hearing aid
US4495643A (en) * 1983-03-31 1985-01-22 Orban Associates, Inc. Audio peak limiter using Hilbert transforms
US4920568A (en) * 1985-07-16 1990-04-24 Sharp Kabushiki Kaisha Method of distinguishing voice from noise
US4741018A (en) 1987-04-24 1988-04-26 Motorola, Inc. Speakerphone using digitally compressed audio to control voice path gain
JP2935266B2 (en) * 1987-05-11 1999-08-16 ジャンポルスキー、アーサー Paradoxical hearing aids
US4882762A (en) * 1988-02-23 1989-11-21 Resound Corporation Multi-band programmable compression system
US5091952A (en) * 1988-11-10 1992-02-25 Wisconsin Alumni Research Foundation Feedback suppression in digital signal processing hearing aids
SE465144B (en) * 1990-06-26 1991-07-29 Ericsson Ge Mobile Communicat SET AND DEVICE FOR PROCESSING AN ANALOGUE SIGNAL
DE69233156T2 (en) * 1991-01-17 2004-07-08 Adelman, Roger A. IMPROVED HEARING AID
US5278912A (en) * 1991-06-28 1994-01-11 Resound Corporation Multiband programmable compression system
US5524057A (en) * 1992-06-19 1996-06-04 Alpine Electronics Inc. Noise-canceling apparatus
US5323337A (en) * 1992-08-04 1994-06-21 Loral Aerospace Corp. Signal detector employing mean energy and variance of energy content comparison for noise detection
WO1994007341A1 (en) * 1992-09-11 1994-03-31 Hyman Goldberg Electroacoustic speech intelligibility enhancement method and apparatus
US5631969A (en) * 1993-03-25 1997-05-20 Ericsson Inc. System for limiting the magnitude of sampled data
KR0179968B1 (en) * 1993-08-31 1999-05-01 김광호 Sound signal output circuit and the method
DE4336609A1 (en) * 1993-10-27 1995-05-04 Klippel Wolfgang Predictive protective circuit for electroacoustic sound transmitters
DE4340817A1 (en) * 1993-12-01 1995-06-08 Toepholm & Westermann Circuit arrangement for the automatic control of hearing aids
US6173062B1 (en) * 1994-03-16 2001-01-09 Hearing Innovations Incorporated Frequency transpositional hearing aid with digital and single sideband modulation
US5502769A (en) * 1994-04-28 1996-03-26 Starkey Laboratories, Inc. Interface module for programmable hearing instrument
DE4418203C2 (en) * 1994-05-25 1997-09-11 Siemens Audiologische Technik Method for adapting the transmission characteristic of a hearing aid
US5659621A (en) * 1994-08-31 1997-08-19 Argosy Electronics, Inc. Magnetically controllable hearing aid
US5553152A (en) * 1994-08-31 1996-09-03 Argosy Electronics, Inc. Apparatus and method for magnetically controlling a hearing aid
AUPM900594A0 (en) * 1994-10-24 1994-11-17 Cochlear Pty. Limited Automatic sensitivity control
US5581747A (en) * 1994-11-25 1996-12-03 Starkey Labs., Inc. Communication system for programmable devices employing a circuit shift register
US5822442A (en) * 1995-09-11 1998-10-13 Starkey Labs, Inc. Gain compression amplfier providing a linear compression function
US5862238A (en) * 1995-09-11 1999-01-19 Starkey Laboratories, Inc. Hearing aid having input and output gain compression circuits
DE19547093A1 (en) 1995-12-16 1997-06-19 Nokia Deutschland Gmbh Circuit for improvement of noise immunity of audio signal
JPH09182194A (en) * 1995-12-27 1997-07-11 Nec Corp Hearing aid
DE19611026C2 (en) * 1996-03-20 2001-09-20 Siemens Audiologische Technik Distortion suppression in hearing aids with AGC
US6108431A (en) * 1996-05-01 2000-08-22 Phonak Ag Loudness limiter
KR100432196B1 (en) * 1996-06-10 2004-07-16 후지 덴끼 가부시키가이샤 Noise-cut filter for power converter
DE19625639C2 (en) * 1996-06-26 2002-07-18 Siemens Audiologische Technik hearing Aid
US5884255A (en) * 1996-07-16 1999-03-16 Coherent Communications Systems Corp. Speech detection system employing multiple determinants
US5903655A (en) * 1996-10-23 1999-05-11 Telex Communications, Inc. Compression systems for hearing aids
EP0845921A1 (en) * 1996-10-23 1998-06-03 Siemens Audiologische Technik GmbH Method and circuit for regulating the volume in digital hearing aids
US5757933A (en) * 1996-12-11 1998-05-26 Micro Ear Technology, Inc. In-the-ear hearing aid with directional microphone system
JPH10191497A (en) * 1996-12-17 1998-07-21 Texas Instr Inc <Ti> Digital hearing aid, and modeling method for feedback path
US6449662B1 (en) * 1997-01-13 2002-09-10 Micro Ear Technology, Inc. System for programming hearing aids
DE19703228B4 (en) * 1997-01-29 2006-08-03 Siemens Audiologische Technik Gmbh Method for amplifying input signals of a hearing aid and circuit for carrying out the method
US6236731B1 (en) * 1997-04-16 2001-05-22 Dspfactory Ltd. Filterbank structure and method for filtering and separating an information signal into different bands, particularly for audio signal in hearing aids
US6240192B1 (en) * 1997-04-16 2001-05-29 Dspfactory Ltd. Apparatus for and method of filtering in an digital hearing aid, including an application specific integrated circuit and a programmable digital signal processor
US5825631A (en) * 1997-04-16 1998-10-20 Starkey Laboratories Method for connecting two substrates in a thick film hybrid circuit
US6049618A (en) * 1997-06-30 2000-04-11 Siemens Hearing Instruments, Inc. Hearing aid having input AGC and output AGC
US5892834A (en) * 1997-06-30 1999-04-06 Ford Motor Company Audio level dynamic range compression
US6205225B1 (en) * 1997-12-03 2001-03-20 Orban, Inc. Lower sideband modulation distortion cancellation
DK1059016T3 (en) * 1997-12-23 2002-09-09 Widex As Dynamic automatic gain control in a hearing aid
US6366863B1 (en) * 1998-01-09 2002-04-02 Micro Ear Technology Inc. Portable hearing-related analysis system
US6256395B1 (en) * 1998-01-30 2001-07-03 Gn Resound As Hearing aid output clipping apparatus
US6347148B1 (en) * 1998-04-16 2002-02-12 Dspfactory Ltd. Method and apparatus for feedback reduction in acoustic systems, particularly in hearing aids
EP1120008B1 (en) 1998-10-07 2011-07-27 Oticon A/S Feedback management for hearing aid
DK1135968T3 (en) * 1998-12-11 2002-12-02 Siemens Audiologische Technik Method for producing constant sound pressure levels in hearing aids as well as hearing aids
US6490556B2 (en) * 1999-05-28 2002-12-03 Intel Corporation Audio classifier for half duplex communication
US6292571B1 (en) * 1999-06-02 2001-09-18 Sarnoff Corporation Hearing aid digital filter
JP2001084506A (en) * 1999-09-17 2001-03-30 Fujitsu Ltd Noise elimination circuit, amplifier circuit, and magnetic recorder
US6526140B1 (en) * 1999-11-03 2003-02-25 Tellabs Operations, Inc. Consolidated voice activity detection and noise estimation
US7489790B2 (en) * 2000-12-05 2009-02-10 Ami Semiconductor, Inc. Digital automatic gain control
US20020076073A1 (en) * 2000-12-19 2002-06-20 Taenzer Jon C. Automatically switched hearing aid communications earpiece

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071695A (en) * 1976-08-12 1978-01-31 Bell Telephone Laboratories, Incorporated Speech signal amplitude equalizer
US4410764A (en) * 1981-06-29 1983-10-18 Rockwell International Corporation Speech processor for processing analog signals
US5633937A (en) * 1991-11-13 1997-05-27 Viennatone Ag Method for processing signals
US5528696A (en) * 1993-09-27 1996-06-18 Viennatone Gesellschaft M.B.H. Hearing aid
US6104822A (en) * 1995-10-10 2000-08-15 Audiologic, Inc. Digital signal processing hearing aid

Also Published As

Publication number Publication date
US7139403B2 (en) 2006-11-21
US20070147639A1 (en) 2007-06-28
US8009842B2 (en) 2011-08-30
US20090208033A1 (en) 2009-08-20
CA2430777A1 (en) 2002-06-13
US20020110253A1 (en) 2002-08-15
US20020067838A1 (en) 2002-06-06
WO2002047435A2 (en) 2002-06-13
US9559653B2 (en) 2017-01-31
EP1433358A2 (en) 2004-06-30
US7489790B2 (en) 2009-02-10
US20130285747A1 (en) 2013-10-31
AU2002232485A1 (en) 2002-06-18

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