EP2621198A3 - Adaptive feedback cancellation based on inserted and/or intrinsic signal characteristics and matched retrieval - Google Patents

Adaptive feedback cancellation based on inserted and/or intrinsic signal characteristics and matched retrieval Download PDF

Info

Publication number
EP2621198A3
EP2621198A3 EP13164634.1A EP13164634A EP2621198A3 EP 2621198 A3 EP2621198 A3 EP 2621198A3 EP 13164634 A EP13164634 A EP 13164634A EP 2621198 A3 EP2621198 A3 EP 2621198A3
Authority
EP
European Patent Office
Prior art keywords
noise
signal
inserted
signal characteristics
adaptive feedback
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.)
Pending
Application number
EP13164634.1A
Other languages
German (de)
French (fr)
Other versions
EP2621198A2 (en
Inventor
Jesper Jensen
Thomas Bo Elmedyb
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.)
Oticon AS
Original Assignee
Oticon AS
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
Priority to PCT/EP2009/053920 priority Critical patent/WO2010112073A1/en
Priority to US24567909P priority
Application filed by Oticon AS filed Critical Oticon AS
Priority to EP13164634.1A priority patent/EP2621198A3/en
Priority to EP10157933A priority patent/EP2237573A1/en
Publication of EP2621198A2 publication Critical patent/EP2621198A2/en
Publication of EP2621198A3 publication Critical patent/EP2621198A3/en
Application status is Pending legal-status Critical

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
    • H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17819—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the reference signals, e.g. to prevent howling
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • 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
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3055—Transfer function of the acoustic system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/01—Hearing devices using active noise cancellation
    • 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
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/552—Binaural
    • 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
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/554—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired using a wireless connection, e.g. between microphone and amplifier or using Tcoils

Abstract

The object of the present invention is to provide an alternative scheme for minimizing feedback in audio processing systems. The audio processing system comprises an enhancement unit for estimating noise-like signal components in the electric signal of a forward path and providing a noise signal estimate output, based on filtering by an adaptive noise retrieval filter E of a signal yc from another microphone (e.g. of a contra-lateral listening device), and wherein a feedback path estimation unit is adapted to use the noise signal estimate output in the estimation of an acoustic feedback transfer function.
EP13164634.1A 2009-04-02 2010-03-26 Adaptive feedback cancellation based on inserted and/or intrinsic signal characteristics and matched retrieval Pending EP2621198A3 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/EP2009/053920 WO2010112073A1 (en) 2009-04-02 2009-04-02 Adaptive feedback cancellation based on inserted and/or intrinsic characteristics and matched retrieval
US24567909P true 2009-09-25 2009-09-25
EP13164634.1A EP2621198A3 (en) 2009-04-02 2010-03-26 Adaptive feedback cancellation based on inserted and/or intrinsic signal characteristics and matched retrieval
EP10157933A EP2237573A1 (en) 2009-04-02 2010-03-26 Adaptive feedback cancellation method and apparatus therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13164634.1A EP2621198A3 (en) 2009-04-02 2010-03-26 Adaptive feedback cancellation based on inserted and/or intrinsic signal characteristics and matched retrieval

Related Parent Applications (4)

Application Number Title Priority Date Filing Date
EP10157933A Division EP2237573A1 (en) 2009-04-02 2010-03-26 Adaptive feedback cancellation method and apparatus therefor
EP10157933A Previously-Filed-Application EP2237573A1 (en) 2009-04-02 2010-03-26 Adaptive feedback cancellation method and apparatus therefor
EP10157933 Previously-Filed-Application 2010-03-26
EP10157933.2 Division 2010-03-26

Publications (2)

Publication Number Publication Date
EP2621198A2 EP2621198A2 (en) 2013-07-31
EP2621198A3 true EP2621198A3 (en) 2015-03-25

Family

ID=42167684

Family Applications (2)

Application Number Title Priority Date Filing Date
EP13164634.1A Pending EP2621198A3 (en) 2009-04-02 2010-03-26 Adaptive feedback cancellation based on inserted and/or intrinsic signal characteristics and matched retrieval
EP10157933A Pending EP2237573A1 (en) 2009-04-02 2010-03-26 Adaptive feedback cancellation method and apparatus therefor

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP10157933A Pending EP2237573A1 (en) 2009-04-02 2010-03-26 Adaptive feedback cancellation method and apparatus therefor

Country Status (1)

Country Link
EP (2) EP2621198A3 (en)

Families Citing this family (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9142207B2 (en) 2010-12-03 2015-09-22 Cirrus Logic, Inc. Oversight control of an adaptive noise canceler in a personal audio device
US8908877B2 (en) 2010-12-03 2014-12-09 Cirrus Logic, Inc. Ear-coupling detection and adjustment of adaptive response in noise-canceling in personal audio devices
MX2013009148A (en) 2011-02-16 2013-08-29 Dolby Lab Licensing Corp Methods and systems for generating filter coefficients and configuring filters.
US9824677B2 (en) 2011-06-03 2017-11-21 Cirrus Logic, Inc. Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC)
US9214150B2 (en) 2011-06-03 2015-12-15 Cirrus Logic, Inc. Continuous adaptation of secondary path adaptive response in noise-canceling personal audio devices
US9325821B1 (en) 2011-09-30 2016-04-26 Cirrus Logic, Inc. Sidetone management in an adaptive noise canceling (ANC) system including secondary path modeling
US8958571B2 (en) 2011-06-03 2015-02-17 Cirrus Logic, Inc. MIC covering detection in personal audio devices
US8948407B2 (en) 2011-06-03 2015-02-03 Cirrus Logic, Inc. Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC)
US9318094B2 (en) 2011-06-03 2016-04-19 Cirrus Logic, Inc. Adaptive noise canceling architecture for a personal audio device
EP2574082A1 (en) * 2011-09-20 2013-03-27 Oticon A/S Control of an adaptive feedback cancellation system based on probe signal injection
US9014387B2 (en) 2012-04-26 2015-04-21 Cirrus Logic, Inc. Coordinated control of adaptive noise cancellation (ANC) among earspeaker channels
US9123321B2 (en) 2012-05-10 2015-09-01 Cirrus Logic, Inc. Sequenced adaptation of anti-noise generator response and secondary path response in an adaptive noise canceling system
US9319781B2 (en) 2012-05-10 2016-04-19 Cirrus Logic, Inc. Frequency and direction-dependent ambient sound handling in personal audio devices having adaptive noise cancellation (ANC)
US9318090B2 (en) 2012-05-10 2016-04-19 Cirrus Logic, Inc. Downlink tone detection and adaptation of a secondary path response model in an adaptive noise canceling system
US9532139B1 (en) 2012-09-14 2016-12-27 Cirrus Logic, Inc. Dual-microphone frequency amplitude response self-calibration
DK2736271T3 (en) 2012-11-27 2019-09-16 Oticon As Procedure for Controlling an Update Algorithm for an Adaptive Feedback Estimation System and a De-Correlation Unit
US9369798B1 (en) 2013-03-12 2016-06-14 Cirrus Logic, Inc. Internal dynamic range control in an adaptive noise cancellation (ANC) system
US9414150B2 (en) 2013-03-14 2016-08-09 Cirrus Logic, Inc. Low-latency multi-driver adaptive noise canceling (ANC) system for a personal audio device
US9208771B2 (en) 2013-03-15 2015-12-08 Cirrus Logic, Inc. Ambient noise-based adaptation of secondary path adaptive response in noise-canceling personal audio devices
US9324311B1 (en) 2013-03-15 2016-04-26 Cirrus Logic, Inc. Robust adaptive noise canceling (ANC) in a personal audio device
US10206032B2 (en) 2013-04-10 2019-02-12 Cirrus Logic, Inc. Systems and methods for multi-mode adaptive noise cancellation for audio headsets
US9462376B2 (en) 2013-04-16 2016-10-04 Cirrus Logic, Inc. Systems and methods for hybrid adaptive noise cancellation
US9460701B2 (en) 2013-04-17 2016-10-04 Cirrus Logic, Inc. Systems and methods for adaptive noise cancellation by biasing anti-noise level
US9478210B2 (en) 2013-04-17 2016-10-25 Cirrus Logic, Inc. Systems and methods for hybrid adaptive noise cancellation
US9578432B1 (en) 2013-04-24 2017-02-21 Cirrus Logic, Inc. Metric and tool to evaluate secondary path design in adaptive noise cancellation systems
US9392364B1 (en) 2013-08-15 2016-07-12 Cirrus Logic, Inc. Virtual microphone for adaptive noise cancellation in personal audio devices
US9666176B2 (en) 2013-09-13 2017-05-30 Cirrus Logic, Inc. Systems and methods for adaptive noise cancellation by adaptively shaping internal white noise to train a secondary path
US9620101B1 (en) 2013-10-08 2017-04-11 Cirrus Logic, Inc. Systems and methods for maintaining playback fidelity in an audio system with adaptive noise cancellation
DK2874409T3 (en) 2013-11-15 2018-12-10 Oticon As Hearing aid with adaptive feedback path estimation
US10382864B2 (en) 2013-12-10 2019-08-13 Cirrus Logic, Inc. Systems and methods for providing adaptive playback equalization in an audio device
US10219071B2 (en) 2013-12-10 2019-02-26 Cirrus Logic, Inc. Systems and methods for bandlimiting anti-noise in personal audio devices having adaptive noise cancellation
US9704472B2 (en) 2013-12-10 2017-07-11 Cirrus Logic, Inc. Systems and methods for sharing secondary path information between audio channels in an adaptive noise cancellation system
US9369557B2 (en) 2014-03-05 2016-06-14 Cirrus Logic, Inc. Frequency-dependent sidetone calibration
US9479860B2 (en) 2014-03-07 2016-10-25 Cirrus Logic, Inc. Systems and methods for enhancing performance of audio transducer based on detection of transducer status
US9319784B2 (en) * 2014-04-14 2016-04-19 Cirrus Logic, Inc. Frequency-shaped noise-based adaptation of secondary path adaptive response in noise-canceling personal audio devices
US10181315B2 (en) 2014-06-13 2019-01-15 Cirrus Logic, Inc. Systems and methods for selectively enabling and disabling adaptation of an adaptive noise cancellation system
US9478212B1 (en) 2014-09-03 2016-10-25 Cirrus Logic, Inc. Systems and methods for use of adaptive secondary path estimate to control equalization in an audio device
US9552805B2 (en) 2014-12-19 2017-01-24 Cirrus Logic, Inc. Systems and methods for performance and stability control for feedback adaptive noise cancellation
KR20180044324A (en) 2015-08-20 2018-05-02 시러스 로직 인터내셔널 세미컨덕터 리미티드 A feedback adaptive noise cancellation (ANC) controller and a method having a feedback response partially provided by a fixed response filter
US9578415B1 (en) 2015-08-21 2017-02-21 Cirrus Logic, Inc. Hybrid adaptive noise cancellation system with filtered error microphone signal
DE102015216822B4 (en) 2015-09-02 2017-07-06 Sivantos Pte. Ltd. A method of suppressing feedback in a hearing aid
EP3139636B1 (en) 2015-09-07 2019-10-16 Oticon A/s A hearing device comprising a feedback cancellation system based on signal energy relocation
EP3409380A1 (en) * 2017-05-31 2018-12-05 Nxp B.V. Acoustic processor
EP3525489A1 (en) 2018-02-09 2019-08-14 Oticon A/s A method of fitting a hearing device to a user's needs, a programming device, and a hearing system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0579152A1 (en) * 1992-07-13 1994-01-19 Minnesota Mining And Manufacturing Company Auditory prosthesis, noise suppression apparatus and feedback suppression apparatus having focused adapted filtering
US6650756B1 (en) * 1997-05-21 2003-11-18 Alpine Electronics, Inc. Method and apparatus for characterizing audio transmitting system, and method and apparatus for setting characteristics of audio filter
WO2007125132A2 (en) * 2007-05-22 2007-11-08 Phonak Ag Method for feedback cancelling in a hearing device and a hearing device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8919591D0 (en) 1989-08-30 1989-10-11 Gn Davavox As Hearing aid having compensation for acoustic feedback
US6418227B1 (en) * 1996-12-17 2002-07-09 Texas Instruments Incorporated Active noise control system and method for on-line feedback path modeling
US6434247B1 (en) * 1999-07-30 2002-08-13 Gn Resound A/S Feedback cancellation apparatus and methods utilizing adaptive reference filter mechanisms
US20070172080A1 (en) 2004-02-11 2007-07-26 Koninklijke Philips Electronic, N.V. Acoustic feedback suppression

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0579152A1 (en) * 1992-07-13 1994-01-19 Minnesota Mining And Manufacturing Company Auditory prosthesis, noise suppression apparatus and feedback suppression apparatus having focused adapted filtering
US6650756B1 (en) * 1997-05-21 2003-11-18 Alpine Electronics, Inc. Method and apparatus for characterizing audio transmitting system, and method and apparatus for setting characteristics of audio filter
WO2007125132A2 (en) * 2007-05-22 2007-11-08 Phonak Ag Method for feedback cancelling in a hearing device and a hearing device

Also Published As

Publication number Publication date
EP2621198A2 (en) 2013-07-31
EP2237573A1 (en) 2010-10-06

Similar Documents

Publication Publication Date Title
US8744100B2 (en) Hearing aid in which signal processing is controlled based on a correlation between multiple input signals
DK3190587T3 (en) Noise estimation for noise reduction and echo suppression in personal communication
US10332502B2 (en) Noise reducing device, noise reducing method, noise reducing program, and noise reducing audio outputting device
US9071214B2 (en) Audio signal controller
EP2381700A1 (en) Signal dereverberation using environment information
US20040086137A1 (en) Adaptive control system for noise cancellation
KR101444100B1 (en) Noise cancelling method and apparatus from the mixed sound
US20100002891A1 (en) Apparatus and method for detecting acoustic feedback
JP2011527025A (en) System and method for providing noise suppression utilizing nulling denoising
EP2907323B1 (en) Method and apparatus for audio interference estimation
Yousefian et al. A dual-microphone speech enhancement algorithm based on the coherence function
EP1290912B1 (en) Method for noise suppression in an adaptive beamformer
JP5675848B2 (en) Adaptive noise suppression by level cue
US20080317259A1 (en) Method and apparatus for noise suppression in a small array microphone system
AU2009349918B2 (en) Method and processing unit for adaptive wind noise suppression in a hearing aid system and a hearing aid system
US9438992B2 (en) Multi-microphone robust noise suppression
BR0009740A (en) System for noise reduction and method of processing a noisy input signal and a noise signal to provide an output signal of low noise, and its cellphone
DE102008027848B4 (en) Echo cancellers, echo cancellation and computer readable storage media
RU2010116295A (en) Device and method for coding a multi-channel audio signal
WO2006012578A3 (en) Separation of target acoustic signals in a multi-transducer arrangement
MX2010008288A (en) Method and apparatus for estimating high-band energy in a bandwidth extension system.
US20080285774A1 (en) Howling Suppression Device, Program, Integrated Circuit, and Howling Suppression Method
CN101719969B (en) Method and system for judging double-end conversation and method and system for eliminating echo
DE102005032274A1 (en) Hearing apparatus and corresponding method for eigenvoice detection
EP1596634A3 (en) Sound pickup apparatus and echo cancellation processing method

Legal Events

Date Code Title Description
AK Designated contracting states:

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AC Divisional application (art. 76) of:

Ref document number: 2237573

Country of ref document: EP

Kind code of ref document: P

RIC1 Classification (correction)

Ipc: H04R 3/02 20060101ALI20150219BHEP

Ipc: H04R 25/00 20060101AFI20150219BHEP

AK Designated contracting states:

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

17P Request for examination filed

Effective date: 20150925

RBV Designated contracting states (correction):

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

17Q First examination report

Effective date: 20180608