WO1999011045A1 - Suppression du bruit pour un combine telephonique - Google Patents

Suppression du bruit pour un combine telephonique Download PDF

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Publication number
WO1999011045A1
WO1999011045A1 PCT/GB1998/002518 GB9802518W WO9911045A1 WO 1999011045 A1 WO1999011045 A1 WO 1999011045A1 GB 9802518 W GB9802518 W GB 9802518W WO 9911045 A1 WO9911045 A1 WO 9911045A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
sidetone
noise
handset
microphone
Prior art date
Application number
PCT/GB1998/002518
Other languages
English (en)
Inventor
Robert William Stewart
Jonathan Peter Hiscock
Original Assignee
The Secretary Of State For The Environment, Transport And The Regions
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 The Secretary Of State For The Environment, Transport And The Regions filed Critical The Secretary Of State For The Environment, Transport And The Regions
Priority to AU90822/98A priority Critical patent/AU9082298A/en
Publication of WO1999011045A1 publication Critical patent/WO1999011045A1/fr

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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • 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
    • 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
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
    • 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
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
    • G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • 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
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Definitions

  • the present invention relates to noise suppression for a telephone handset, particularly, although not exclusively a handset forming part of a roadside emergency telephone.
  • a method of improving intelligibility of telephone-handset communication in a noisy environment including the steps of: adaptively filtering a noise signal obtained from a reference microphone to derive an anti-noise signal and combining this signal with a sidetone signal derived from a mouthpiece microphone such that the noise signal present in the sidetone signal is substantially removed leaving a signal with the noise attenuated for supply to an earpiece as instrument sidetone.
  • the anti-noise signal may be mixed with the sidetone signal after the latter signal has been split from the mouthpiece microphone signal carrying voice and noise signals to the telephone network, the removal of noise may take place prior to splitting the microphone signal thereby resulting in a substantially noise-free voice signal reaching not only the earpiece but also the telephone network. This has the effect of further reducing the noise received at the earpiece by reflections of the signal sent to the telephone network.
  • means may be provided for forming a so-called zone-of-quiet around the earpiece of the handset.
  • Such means may also have the ability to compensate for changes in the acoustic path caused by different handset characteristics and/or the force with which the handset is applied to an ear of a caller.
  • Figure 1 is a schematic diagram setting out the principal of adaptive noise cancellation
  • Figure 2 is a schematic diagram of a telephone handset and filter apparatus according to the invention to allow noise suppression of a sidetone signal;
  • Figure 3 is a schematic diagram of a variant of the telephone handset of Figure 2;
  • Figure 4 is a schematic diagram of the telephone handset of Figures 3 and 4 further incorporating earpiece adaptive noise cancellation apparatus.
  • Figure 5 is a schematic diagram of the handset of Figure 4 showing the adaptive noise cancellation circuitry in more detail .
  • the apparatus 1 has a pair of microphones 3,5 of which one microphone 3 is arranged to receive a voice signal ⁇ (k) 7 from a user 9 calling for assistance and which, in addition, unavoidably receives unwanted background traffic noise n(k) 11.
  • a second microphone 5 which is substantially acoustically isolated from the user 7 is arranged to deliberately receive traffic noise n'(k) 11 only.
  • the combined signal s(k) 7 and noise n(k) 11 are summed in summing means 13 with the output y(k) 15 from an adaptive filter 17.
  • the output y(k) 15 from the filter 17 is, itself, the result of applying a known filter algorithm to the noise n'(k) 11 received by the second microphone, in accordance with the feedback of the output e(k) 19 from the summing means 13.
  • the output e(k) 19 is, of course, intended to correspond as closely as possible to the voice signal ⁇ (k) 7 of the user and is subsequently received by an operator listening to the user's requests for assistance.
  • Figures 2 and 3 show an adaptive filter apparatus employed in a telephone handset to reduce the detrimental effect of traffic noise being fed to the user's ear via instrument sidetone.
  • Sidetone which is low-volume feedback of the user's voice signal to the earpiece of the instrument, is a requirement of telephone operating authorities and provides reassurance to the user that the handset is not "dead”.
  • traffic noise 11 is received by reference microphone 5 and handset microphone 3.
  • a voice signal 7 is received at the handset microphone 3 from the user 9.
  • the output signal 21 from the handset microphone 3 is passed principally, via the telephone network to an operator 27. However, a portion of the output signal 21 is spilt away as sidetone 29.
  • This sidetone signal 29 is mixed in mixer means 31 with an incoming operator voice signal 33.
  • the combined operator signal and sidetone 35 is then passed to the summing means 13 where it is summed with the output 15 of the adaptive filter 17. Consequently, the output from the summing means 13 namely output signal 23 contains merely the instrument sidetone signal and the voice signal 33 of the operator 27, the unwanted traffic noise 11 being substantially removed.
  • This signal 23 is then used to drive the earpiece 37 of the handset 1.
  • FIG 3 there is shown a variation of the handset in which the adaptive filter apparatus of Figure 1 is employed not only to remove unwanted traffic noise 11 from the sidetone 29 fed to the user 9, but also reduces the unwanted traffic noise 11 passed to the operator 27.
  • voice signal 7 and traffic noise 11 are received by the handset microphone 3 and reference microphone 5 and adaptively filtered as described above.
  • a substantially noise free signal 23 is obtained which can be fed to the operator and a portion thereof fed, as noise-free sidetone for subsequent mixing with the operator voice signal 33.
  • the benefit of adaptive filtering is available both to the user 9 and the operator 27.
  • the adaptive noise cancellation techniques may be employed to produce a so-called zone-of-quiet around the earpiece of the handset as shown in Figure 4 and in more detail in Figure 5.
  • traffic noise 11 is received by reference microphone 5 and handset microphone 3.
  • a voice signal 7 is received at the handset microphone 3 from the user 9, enabling an instrument sidetone level to be derived via an attenuator.
  • the user 9 receives an audible signal 40 from the earpiece 37 via an acoustic path 43 having an impulse response He(f).
  • Reference microphone 5 is substantially acoustically isolated from microphone 3 and error microphone 38.
  • Traffic noise 11 received by reference microphone 5 produces a noise signal x(k) 25 which is fed to adaptive filter 46, model of impulse response He(f), He(z) 42, and sidetone control element 41.
  • Adaptive filter 17 uses noise signal x(k) 25, coefficients from the model of impulse response He(z) 42 and an error signal 44, produced by an error microphone 38 situated within the acoustic path He(f) 43, to produce an anti-noise signal 45.
  • the anti-noise signal 45 is fed to a mixer means 31 to be combined with the signal received from the telephone network 33 and the instrument sidetone signal via the sidetone control element

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Signal Processing (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Otolaryngology (AREA)
  • Telephone Set Structure (AREA)

Abstract

Pour améliorer l'utilisation d'un combiné téléphonique (1), on utilise un procédé permettant d'atténuer le bruit produit dans l'environnement. Ce procédé consiste à dériver un signal (15) anti-bruit provenant d'un microphone (5) de référence et à combiner ce signal avec un effet local (35) de l'instrument pour l'envoyer au pavillon de l'écouteur (37) du combiné (1). Le signal (15) anti-bruit peut être mélangé au signal du microphone du combiné ou au signal vocal (7) avant la retransmission de ce signal au réseau téléphonique. Il résulte de ce système que les améliorations apportées à l'intélligibilité profitent non seulement à l'utilisateur du combiné mais aussi au correspondant appelé.
PCT/GB1998/002518 1997-08-21 1998-08-21 Suppression du bruit pour un combine telephonique WO1999011045A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU90822/98A AU9082298A (en) 1997-08-21 1998-08-21 Telephone handset noise suppression

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9717816.4 1997-08-21
GBGB9717816.4A GB9717816D0 (en) 1997-08-21 1997-08-21 Telephone handset noise supression

Publications (1)

Publication Number Publication Date
WO1999011045A1 true WO1999011045A1 (fr) 1999-03-04

Family

ID=10817877

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/002518 WO1999011045A1 (fr) 1997-08-21 1998-08-21 Suppression du bruit pour un combine telephonique

Country Status (3)

Country Link
AU (1) AU9082298A (fr)
GB (1) GB9717816D0 (fr)
WO (1) WO1999011045A1 (fr)

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6768795B2 (en) 2001-01-11 2004-07-27 Telefonaktiebolaget Lm Ericsson (Publ) Side-tone control within a telecommunication instrument
GB2406251A (en) * 2003-09-22 2005-03-23 Agere Systems Inc System and method for obscuring unwanted ambient noise and handset and central office equipment incorporating the same
EP1806840A1 (fr) * 2006-01-05 2007-07-11 Siemens Schweiz AG Gain adaptatif pour l'ajustement du volume de la voix
US7706525B2 (en) * 2001-10-01 2010-04-27 Kyocera Wireless Corp. Systems and methods for side-tone noise suppression
WO2011159858A1 (fr) * 2010-06-17 2011-12-22 Dolby Laboratories Licensing Corporation Procédé et appareil pour réduire l'effet du bruit ambiant sur des auditeurs
EP2782260A1 (fr) * 2013-03-22 2014-09-24 Unify GmbH & Co. KG Procédé et dispositif de commande d'une communication vocale et utilisation de ceux-ci
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
WO2015134617A1 (fr) * 2014-03-05 2015-09-11 Cirrus Logic, Inc. Étalonnage d'effet local dépendant de la fréquence
US9142207B2 (en) 2010-12-03 2015-09-22 Cirrus Logic, Inc. Oversight control of an adaptive noise canceler in a personal audio device
US9190043B2 (en) 2013-08-27 2015-11-17 Bose Corporation Assisting conversation in noisy environments
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
US9214150B2 (en) 2011-06-03 2015-12-15 Cirrus Logic, Inc. Continuous adaptation of secondary path adaptive response in noise-canceling personal audio devices
US9226068B2 (en) 2012-04-26 2015-12-29 Cirrus Logic, Inc. Coordinated gain control in adaptive noise cancellation (ANC) for earspeakers
US9230532B1 (en) 2012-09-14 2016-01-05 Cirrus, Logic Inc. Power management of adaptive noise cancellation (ANC) in a personal audio device
US9288570B2 (en) 2013-08-27 2016-03-15 Bose Corporation Assisting conversation while listening to audio
US9294836B2 (en) 2013-04-16 2016-03-22 Cirrus Logic, Inc. Systems and methods for adaptive noise cancellation including secondary path estimate monitoring
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)
US9318094B2 (en) 2011-06-03 2016-04-19 Cirrus Logic, Inc. Adaptive noise canceling architecture for a personal audio device
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
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
US9324311B1 (en) 2013-03-15 2016-04-26 Cirrus Logic, Inc. Robust adaptive noise canceling (ANC) in a personal audio device
US9325821B1 (en) 2011-09-30 2016-04-26 Cirrus Logic, Inc. Sidetone management in an adaptive noise canceling (ANC) system including secondary path modeling
US9369798B1 (en) 2013-03-12 2016-06-14 Cirrus Logic, Inc. Internal dynamic range control in an adaptive noise cancellation (ANC) system
US9368099B2 (en) 2011-06-03 2016-06-14 Cirrus Logic, Inc. Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC)
US9392364B1 (en) 2013-08-15 2016-07-12 Cirrus Logic, Inc. Virtual microphone for adaptive noise cancellation in personal audio devices
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
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
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
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
US9552805B2 (en) 2014-12-19 2017-01-24 Cirrus Logic, Inc. Systems and methods for performance and stability control for feedback adaptive noise cancellation
US9578415B1 (en) 2015-08-21 2017-02-21 Cirrus Logic, Inc. Hybrid adaptive noise cancellation system with filtered error microphone signal
US9578432B1 (en) 2013-04-24 2017-02-21 Cirrus Logic, Inc. Metric and tool to evaluate secondary path design in adaptive noise cancellation systems
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
US9646595B2 (en) 2010-12-03 2017-05-09 Cirrus Logic, Inc. Ear-coupling detection and adjustment of adaptive response in noise-canceling 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
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
US9824677B2 (en) 2011-06-03 2017-11-21 Cirrus Logic, Inc. Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC)
WO2018018782A1 (fr) * 2016-07-25 2018-02-01 中兴通讯股份有限公司 Procédé de réduction de bruit, terminal et support de stockage informatique
US10026388B2 (en) 2015-08-20 2018-07-17 Cirrus Logic, Inc. Feedback adaptive noise cancellation (ANC) controller and method having a feedback response partially provided by a fixed-response filter
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
US10206032B2 (en) 2013-04-10 2019-02-12 Cirrus Logic, Inc. Systems and methods for multi-mode adaptive noise cancellation for audio headsets
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
US10382864B2 (en) 2013-12-10 2019-08-13 Cirrus Logic, Inc. Systems and methods for providing adaptive playback equalization in an audio device
US10412479B2 (en) 2015-07-17 2019-09-10 Cirrus Logic, Inc. Headset management by microphone terminal characteristic detection
US10468048B2 (en) 2011-06-03 2019-11-05 Cirrus Logic, Inc. Mic covering detection in personal audio devices

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Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6768795B2 (en) 2001-01-11 2004-07-27 Telefonaktiebolaget Lm Ericsson (Publ) Side-tone control within a telecommunication instrument
US7706525B2 (en) * 2001-10-01 2010-04-27 Kyocera Wireless Corp. Systems and methods for side-tone noise suppression
GB2406251A (en) * 2003-09-22 2005-03-23 Agere Systems Inc System and method for obscuring unwanted ambient noise and handset and central office equipment incorporating the same
GB2406251B (en) * 2003-09-22 2005-12-07 Agere Systems Inc System and method for obscuring unwanted ambient noise and handset and central office equipment incorporating the same
US7162212B2 (en) 2003-09-22 2007-01-09 Agere Systems Inc. System and method for obscuring unwanted ambient noise and handset and central office equipment incorporating the same
EP1806840A1 (fr) * 2006-01-05 2007-07-11 Siemens Schweiz AG Gain adaptatif pour l'ajustement du volume de la voix
US9135907B2 (en) 2010-06-17 2015-09-15 Dolby Laboratories Licensing Corporation Method and apparatus for reducing the effect of environmental noise on listeners
WO2011159858A1 (fr) * 2010-06-17 2011-12-22 Dolby Laboratories Licensing Corporation Procédé et appareil pour réduire l'effet du bruit ambiant sur des auditeurs
CN102947685A (zh) * 2010-06-17 2013-02-27 杜比实验室特许公司 用于减少环境噪声对收听者的影响的方法和装置
US9633646B2 (en) 2010-12-03 2017-04-25 Cirrus Logic, Inc Oversight control of an adaptive noise canceler in a personal audio device
US9646595B2 (en) 2010-12-03 2017-05-09 Cirrus Logic, Inc. Ear-coupling detection and adjustment of adaptive response in noise-canceling in personal audio devices
US9142207B2 (en) 2010-12-03 2015-09-22 Cirrus Logic, Inc. Oversight control of an adaptive noise canceler in a personal audio device
US10249284B2 (en) 2011-06-03 2019-04-02 Cirrus Logic, Inc. Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC)
US10468048B2 (en) 2011-06-03 2019-11-05 Cirrus Logic, Inc. Mic covering detection in personal audio devices
US9368099B2 (en) 2011-06-03 2016-06-14 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
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