EP0935236A1 - Lärmkontrollegerät mit Schwellwert-Detektion - Google Patents

Lärmkontrollegerät mit Schwellwert-Detektion Download PDF

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Publication number
EP0935236A1
EP0935236A1 EP99400221A EP99400221A EP0935236A1 EP 0935236 A1 EP0935236 A1 EP 0935236A1 EP 99400221 A EP99400221 A EP 99400221A EP 99400221 A EP99400221 A EP 99400221A EP 0935236 A1 EP0935236 A1 EP 0935236A1
Authority
EP
European Patent Office
Prior art keywords
microphone
threshold
noise
cavity
active
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.)
Withdrawn
Application number
EP99400221A
Other languages
English (en)
French (fr)
Inventor
Jamal Housni
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.)
Sagem SA
Original Assignee
Sagem SA
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 Sagem SA filed Critical Sagem SA
Publication of EP0935236A1 publication Critical patent/EP0935236A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G10K11/1783—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • 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
    • G10K11/17821—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 input signals only
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • 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
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
    • 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
    • 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
    • G10K2210/3039—Nonlinear, e.g. clipping, numerical truncation, thresholding or variable input and output gain
    • 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
    • G10K2210/321—Physical
    • G10K2210/3222—Manual tuning
    • 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
    • G10K2210/321—Physical
    • G10K2210/3224—Passive absorbers
    • 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
    • G10K2210/50—Miscellaneous
    • G10K2210/509—Hybrid, i.e. combining different technologies, e.g. passive and active

Definitions

  • the invention relates to an anti-noise device designed to limit the annoyance caused by noise to a user operating in a noisy environment, that this user whether or not in communication with a third party no one.
  • each earpiece has a wall defining a cavity.
  • the wall is upholstered on the internal side of the cavity, soundproofing material.
  • the wall as well provided provides passive attenuation by absorbing medium and high frequency sound waves but remains permeable to low frequency sound waves.
  • the helmet is preferably fitted with a active noise attenuation circuit eliminating waves low frequency sound.
  • the attenuation circuit active generates, from an incident sound wave received in each cavity, a sound attenuation wave, of identical amplitude but in phase opposition with the incident sound wave.
  • the wave propagating in the user's ear canal is the wave resulting from the sum of the incident wave and the wave generated by the active attenuation circuit.
  • the active attenuation circuit includes a electronic processing unit connected in each cavity to active attenuation devices including a microphone picking up a sound wave in the cavity and a loudspeaker emitting the attenuation sound wave produced by the unit treatment.
  • active attenuation devices including a microphone picking up a sound wave in the cavity and a loudspeaker emitting the attenuation sound wave produced by the unit treatment.
  • Such a circuit must be connected to a source power supply.
  • Many attenuation circuits active are continuously powered so it this results in a significant electrical consumption particularly prejudicial to the duration of use of stand-alone headsets in which the power source consists of accumulators providing only one limited amount of electricity.
  • An object of the invention is to obviate the drawbacks cited above.
  • an anti-noise device having at least one earpiece having a cavity delimited by passive attenuation means, a circuit active mitigation having a spatial domain of efficiency and comprising at least one electronic processing unit connected to active attenuation organs including at minus a microphone picking up sound waves in the cavity and a speaker arranged in the cavity for emit sophisticated active attenuation sound waves by the processing unit, at least one switch member selectively operable between a service state of the active attenuation circuit and an idle state of the circuit active attenuation, threshold detection microphone picking up noises outside the space domain of efficiency active attenuation circuit, means of filtering associated with the threshold detection microphone for eliminate noises corresponding to the noises absorbed by the passive attenuation means, and a detector exceeding a noise threshold to control the organ switch in the service or rest state of the circuit active attenuation according to a power level noises detected downstream of the filtering means.
  • the triggering of the attenuation circuit active is a function of the noise power level filtered, i.e. noises that match exactly to those to be eliminated by the attenuation circuit active. Optimal protection is thus ensured for a reduced consumption.
  • the microphone threshold detection is carried by a wall of the headset cavity to pick up noise outside the cavity, the filtering means comprising a filtering mounted between the threshold detection microphone and the threshold overshoot detector.
  • the passive mitigation means are commonly constituted a soundproofing material fixed inside the Headsets. Unless the helmet is removed, the user therefore cannot hear the words of people who surround it even when the surrounding noise is low. This results in permanent isolation of the user, even when it is not necessary.
  • the device comprises a microphone listening carried by a wall of the cavity of the second earpiece to pick up noises outside the cavity, switching means connected to the detection microphone threshold and at the listening microphone and selectively actuated by an additional overshoot detector threshold as a function of a noise power level picked up by the threshold detection microphone between a first state in which the detection microphone threshold and the listening microphone are connected to speakers respective and a second state in which the threshold detection microphone is connected to the body of filtering and the listening microphone is muted. So, the user can listen to outside noises when these noises have a power level below the threshold of noise from the additional threshold overshoot detector.
  • said loudspeakers are associated with the communication circuit and the device includes means for interrupting any link between the microphones and said speakers respective when receiving a communication. So when receiving a communication signal, user is not bothered by noise regardless of the power level of these.
  • the anti-noise device according to the invention is here produced in the form of a helmet and has two earphones 13 connected one to the other by a hoop 14 constituting a support member for headsets 13.
  • a headset 13 includes a wall 1, here represented in the form of a spherical cap, defining a cavity 2.
  • a soundproofing material 3 constituting a means of passive attenuation of noises having a frequency within a specified range of frequencies is arranged, in a manner known per se, in the cavity 2.
  • a bead 11 is fixed along the edge of the wall 1.
  • the noise canceling headset also includes known per se, an active noise attenuation circuit generally designated in 4 and connected to a food source tion in electrical energy not shown.
  • the active attenuation circuit 4 includes, for each atrium 13, an electronic processing unit 6 connected to a microphone 5 and a speaker 7.
  • the processing unit 6 is also connected to the source supply by a supply line 15.
  • the microphone 5 picks up a sound wave in the cavity and transmits a signal electric incident representative of the sound wave at the processing unit 6.
  • the processing unit 6 develops then a representative electrical attenuation signal of a sound wave of identical amplitude but in opposition phase with the sound wave picked up by the microphone 5.
  • the electrical attenuation signal is transmitted to the speaker 7 which emits the corresponding attenuation sound wave in a portion of the cavity constituting the domain of the active attenuation circuit.
  • a switch member 8 is disposed in each earpiece 13 on the supply line 15 between the power source and the processing 6.
  • the switch member 8 is either in a state passer-by in which the switch member allows the supply of the processing unit 6, either in a state blocker (shown in Figures 2, 3 and 4) in which the switch member 8 interrupts the supply of the processing unit 6.
  • a detector of threshold 9 exceeded, placed in one of the two ear cups 13, is connected to the switch members 8 for the order.
  • the threshold crossing detector 9 is connected to a threshold detection microphone 10 housed in the cavity of this headset to pick up the noises in the portion of this cavity outside the space domain of the active attenuation circuit.
  • These noises have been filtered by the sound insulation material and have frequencies in the frequency range of noise processed by the active attenuation circuit so that the threshold overshoot detector 9 analyzes the sounds that are mostly likely to be processed by the active attenuation circuit.
  • the noise captured in the cavity 2 by threshold detection microphone 10 is transmitted to the threshold overrun detector 9.
  • this noise is of a power level greater than a predetermined threshold of the overshoot detector of threshold 9, this commands the setting to the on state switch members 8, thereby activating the active attenuation circuit.
  • the threshold 9 being exceeded commands blocking of each switch member 8.
  • the processing unit 6 no longer supplied with power, then emits no electrical signal mitigation.
  • the active attenuation circuit is then in a state of rest and the processing unit does not consumes no energy.
  • the threshold detection microphone be outside the spatial domain of circuit efficiency active attenuation. In practice this embodiment could be used in case the attenuation circuit active is mounted in an earplug.
  • resistance acoustic 12 consisting for example of a mesh fabric tight, is preferably placed on the microphone 5.
  • the provision of an acoustic resistance of 20dB allows increase the operating range from 40dB to 140dB.
  • the threshold of commissioning of the active attenuation circuit being for example of the order of 60dB, we thus obtain a range effective attenuation from 60dB to 140dB or 80dB, instead from a range of 60dB to 120dB or 60dB only with the same microphone without acoustic resistance. Protection brought by the headphones is thus extended to noise higher power without saturation of the microphones of the active attenuation circuit.
  • the noise canceling headset comprises, as above a threshold overshoot detector 9 connected to the switch members 8 for controlling them.
  • Microphone threshold detection 10 is this time carried by the wall a headset to capture all outside noise to it and the threshold overshoot detector 9 is connected to a filtering member 19 adapted to ensure a elimination of noise in the frequency range of means of passive mitigation.
  • the filtering member 19 and the loudspeaker 7 of the headset supporting the threshold exceeded 9 are connected to the detection microphone threshold 10 through a switching 20.
  • a listening microphone 22 is fixed to the wall of the other earpiece to pick up noise outside this headset and is connected to the corresponding speaker 7 through the switching member 20.
  • An additional overshoot detector threshold 21 is connected to the threshold detection microphone 10 and to the switching member 20 for controlling the switching member switching between a first state (represented in the figure 2) in which the threshold detection microphone 10 and the listening microphone 22 are connected to speakers 7 and a second state in which the detection microphone threshold 10 is connected to the filtering member 19 and the listening microphone 22 is muted.
  • the noise picked up outside cavities by the threshold detection microphone 10 is transmitted to the additional overshoot detector threshold 21.
  • the detector additional threshold overshoot 21 controls setting of the switching member 20 in the first state.
  • the external noises picked up by microphones 10 and 22 are then transmitted to the user by the speakers 7.
  • the threshold overshoot detector 9 controls the switch-on state of the switching devices 8, thereby activating the attenuation circuit active.
  • the threshold overshoot detector 9 controls the blocking state of the switch members 8 of so that only passive noise attenuation is assured.
  • the helmet comprises a outdoor communication circuit including an antenna reception associated with a processing element 30 of the communication signal, and speakers 31 arranged in each cavity and connected to the processing element 30 by tilting members 32.
  • the tilting members 32 are also connected to the switching member 20.
  • the communications body switching 20 is selectively operable between a first state in which the detection microphone threshold 10 and the listening microphone 22 are connected to the tilting members 32 and a second state in which the threshold detection microphone 10 is connected to the filtering 19 and the listening microphone 22 is cut off.
  • the tilting members 32 are selectively actuable between a first state in which the signal communication from processing element 30 is transmitted to speakers 31 and a second state in which the switching member 20 is connected to the speakers 31.
  • the tilting members 32 are brought into their first state when a communication signal sent by the processing element 30 reaches them and switches over to the second state in the absence of such a signal. So in presence of a communication signal, the organs of toggle 32 go into the first state to transmit primarily this signal to the speakers 31, and this, regardless of the power level of external noise or filtered noises.
  • the headset support has been illustrated in the form of an arch to which these are connected, the support could consist of a helmet or a headdress with associated ear flaps by passive mitigation means delimiting the cavities.
  • the threshold detection microphones and listening devices are connected to separate speakers active attenuation circuit speakers.
  • the implementation of the second mode of realization has been described with an overshoot detector threshold 21 set to a lower threshold than the threshold 9 is exceeded, these detectors can be set to any levels relative to each other depending of the desired regulation. Indeed when noises are basically in the frequency range of passive attenuation it may be useful to cut the connection between the external microphone and the speakers without that it is necessary to put the attenuation circuit active in service.
  • the anti-noise device according to the invention is produced in the form of headphones
  • the noise canceling device could for example be integrated into the earpiece of a cellphone.
  • the detection microphone threshold will preferably be the communication microphone of the telephone associated with a filtering device.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Headphones And Earphones (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP99400221A 1998-02-06 1999-02-02 Lärmkontrollegerät mit Schwellwert-Detektion Withdrawn EP0935236A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9801411 1998-02-06
FR9801411A FR2774796B1 (fr) 1998-02-06 1998-02-06 Dispositif anti-bruit a detection de seuil

Publications (1)

Publication Number Publication Date
EP0935236A1 true EP0935236A1 (de) 1999-08-11

Family

ID=9522679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99400221A Withdrawn EP0935236A1 (de) 1998-02-06 1999-02-02 Lärmkontrollegerät mit Schwellwert-Detektion

Country Status (2)

Country Link
EP (1) EP0935236A1 (de)
FR (1) FR2774796B1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8189803B2 (en) 2004-06-15 2012-05-29 Bose Corporation Noise reduction headset
US8995679B2 (en) 2011-12-13 2015-03-31 Bose Corporation Power supply voltage-based headset function control
US9049513B2 (en) 2012-09-18 2015-06-02 Bose Corporation Headset power source managing
GB2577297A (en) * 2018-09-20 2020-03-25 Deborah Caroline Turner Fernback Ear-and-eye mask with noise attenuation and generation
CN113786028A (zh) * 2021-08-30 2021-12-14 航宇救生装备有限公司 飞行员头盔通迅通用化方法
US12183341B2 (en) 2008-09-22 2024-12-31 St Casestech, Llc Personalized sound management and method
US12249326B2 (en) 2007-04-13 2025-03-11 St Case1Tech, Llc Method and device for voice operated control
US12581233B2 (en) 2007-04-13 2026-03-17 ST Case 1 Tech, LLC Method and device for voice operated control
US12586680B2 (en) 2007-02-01 2026-03-24 St Famtech, Llc Method and device for audio recording
US12591407B2 (en) 2014-10-24 2026-03-31 St R&Dtech, Llc Robust voice activity detector system for use with an earphone
US12621598B2 (en) 2022-04-29 2026-05-05 St Famtech, Llc Automatic keyword pass-through system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188210A (en) * 1986-03-21 1987-09-23 Univ Southampton Acoustic noise reduction in ear defenders
EP0425129A2 (de) * 1989-10-27 1991-05-02 Bose Corporation Kopfhörer
US5251263A (en) * 1992-05-22 1993-10-05 Andrea Electronics Corporation Adaptive noise cancellation and speech enhancement system and apparatus therefor
EP0583900A1 (de) * 1992-08-19 1994-02-23 Sony Corporation Verbesserter Kopfhörer
WO1995000946A1 (en) * 1993-06-23 1995-01-05 Noise Cancellation Technologies, Inc. Variable gain active noise cancellation system with improved residual noise sensing
FR2739214A1 (fr) * 1995-09-27 1997-03-28 Technofirst Procede et dispositif d'attenuation active hybride de vibrations, notamment de vibrations mecaniques, sonores ou analogues

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188210A (en) * 1986-03-21 1987-09-23 Univ Southampton Acoustic noise reduction in ear defenders
EP0425129A2 (de) * 1989-10-27 1991-05-02 Bose Corporation Kopfhörer
US5251263A (en) * 1992-05-22 1993-10-05 Andrea Electronics Corporation Adaptive noise cancellation and speech enhancement system and apparatus therefor
EP0583900A1 (de) * 1992-08-19 1994-02-23 Sony Corporation Verbesserter Kopfhörer
WO1995000946A1 (en) * 1993-06-23 1995-01-05 Noise Cancellation Technologies, Inc. Variable gain active noise cancellation system with improved residual noise sensing
FR2739214A1 (fr) * 1995-09-27 1997-03-28 Technofirst Procede et dispositif d'attenuation active hybride de vibrations, notamment de vibrations mecaniques, sonores ou analogues

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8189803B2 (en) 2004-06-15 2012-05-29 Bose Corporation Noise reduction headset
US12597513B2 (en) 2007-02-01 2026-04-07 St Famtech, Llc Method and device for audio recording
US12586680B2 (en) 2007-02-01 2026-03-24 St Famtech, Llc Method and device for audio recording
US12581233B2 (en) 2007-04-13 2026-03-17 ST Case 1 Tech, LLC Method and device for voice operated control
US12249326B2 (en) 2007-04-13 2025-03-11 St Case1Tech, Llc Method and device for voice operated control
US12183341B2 (en) 2008-09-22 2024-12-31 St Casestech, Llc Personalized sound management and method
US12374332B2 (en) 2008-09-22 2025-07-29 ST Fam Tech, LLC Personalized sound management and method
US8995679B2 (en) 2011-12-13 2015-03-31 Bose Corporation Power supply voltage-based headset function control
US9049513B2 (en) 2012-09-18 2015-06-02 Bose Corporation Headset power source managing
US12591407B2 (en) 2014-10-24 2026-03-31 St R&Dtech, Llc Robust voice activity detector system for use with an earphone
GB2577297A (en) * 2018-09-20 2020-03-25 Deborah Caroline Turner Fernback Ear-and-eye mask with noise attenuation and generation
US11688380B2 (en) 2018-09-20 2023-06-27 Deborah Caroline Turner-Fernback Ear device with dynamic noise attenuation and generation
GB2577297B (en) * 2018-09-20 2021-01-20 Deborah Caroline Turner Fernback Ear-and-eye mask with noise attenuation and generation
CN113786028A (zh) * 2021-08-30 2021-12-14 航宇救生装备有限公司 飞行员头盔通迅通用化方法
US12621598B2 (en) 2022-04-29 2026-05-05 St Famtech, Llc Automatic keyword pass-through system

Also Published As

Publication number Publication date
FR2774796A1 (fr) 1999-08-13
FR2774796B1 (fr) 2001-10-05

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