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WO2007011337A1 - Ecouteurs a filtre choisi par l'utilisateur pour suppression active du bruit - Google Patents

Ecouteurs a filtre choisi par l'utilisateur pour suppression active du bruit Download PDF

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Publication number
WO2007011337A1
WO2007011337A1 PCT/US2005/025061 US2005025061W WO2007011337A1 WO 2007011337 A1 WO2007011337 A1 WO 2007011337A1 US 2005025061 W US2005025061 W US 2005025061W WO 2007011337 A1 WO2007011337 A1 WO 2007011337A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency band
noise
active noise
noise reduction
filters
Prior art date
Application number
PCT/US2005/025061
Other languages
English (en)
Inventor
Francis Renard
Keith Lee Lashley
Jacqueline Jai Massela
Original Assignee
Thomson Licensing
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 Thomson Licensing filed Critical Thomson Licensing
Priority to PCT/US2005/025061 priority Critical patent/WO2007011337A1/fr
Publication of WO2007011337A1 publication Critical patent/WO2007011337A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
    • A61F11/06—Protective devices for the ears
    • A61F11/14—Protective devices for the ears external, e.g. earcaps or earmuffs
    • A61F11/145—Protective devices for the ears external, e.g. earcaps or earmuffs electric, e.g. for active noise reduction
    • 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
    • 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
    • G10K11/1781—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
    • G10K11/17827—Desired external signals, e.g. pass-through audio such as music or speech
    • 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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the 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
    • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
    • 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
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication

Definitions

  • the present invention relates to headphones, and particularly to active noise cancellation for reducing ambient noise in headphones.
  • a headset including one or two headphones having active noise reduction typically has a microphone for receiving ambient noise, and one or more filters for providing active noise cancellation or compensation.
  • active noise compensation systems digital or electronic circuits are provided that add an emulated noise signal. Active noise compensation systems that cover a wide range of noise frequencies are known. However, such active noise compensation systems are necessarily expensive, thereby making active noise reduction headphones less desirable.
  • a headphone system has a microphone for receiving ambient noise; a first filter for providing active noise correction of the received noise for the headphone in a first frequency band, a second filter for providing active noise correction in a second frequency band; and a user-controlled selector for selecting one of the first and second filters for providing active noise correction.
  • An embodiment of the invention may include a third filter for providing active noise correction in a third frequency band; in such an embodiment, the user-controlled selector provides for selecting one of the first, second and third filters for providing active noise correction.
  • a method for providing noise correction in a headphone system includes receiving ambient noise at a microphone; and providing active noise correction of the received noise in accordance with a user selection, in one of a first frequency band and a second frequency band.
  • the method may include providing active noise correction of the received noise in accordance with a user selection, in one of a first frequency band, a second frequency band and a third frequency band.
  • FIG. 1 is a perspective view of a headphone system in accordance with an embodiment of the invention.
  • FIG. 1A is another view of a control box of the headphone system of Fig. 1.
  • FIG. 2 is a block diagram of components of a headphone system in accordance with an embodiment of the invention.
  • FIGs. 3A, 3B and 3C illustrate detected noise and noise reduction in exemplary embodiments of the invention.
  • Headphone system 10 in accordance with an embodiment of the present invention.
  • Headphone system 10 is capable of being worn by the user on clothing and on the user's head.
  • Headphone system 10 includes a control box 50 which houses such items as batteries, switches, control circuits, and active noise reduction circuits.
  • Headphone system 10 also includes headset 20 having first and second headphones 22, 24, physically connected to headband 26.
  • Control box 15 communicates with headset 20 through cables 30.
  • Control box 50 comprises a housing 51, and inputs, including an on/off and volume selector 52 and an active filter selector 54.
  • control box 50 is preferably adapted to be attached to the clothing of a user, such as via a clip 55.
  • Control box 55 may have a door 57 covering an opening to a battery compartment.
  • Control box 50 is thus a wearable component.
  • headset 20 mounts on the user's head, and control box 50 is attachable to the user's clothing, system 10 is a wearable headphone system.
  • Control box 50 receives audio signals from a source (not shown) via cable 60.
  • Control box 50 has a variety of components for signal processing, including one or more analog and/or digital filters, and a power supply, including one or more batteries.
  • the signal processing components and drivers, and power supplies therefor are housed in control box 50.
  • the control box may include appropriate display and user interface capabilities including software and/or hardware for enabling a user to control and view parameter settings including filter setting and selections, volume and programming options.
  • FIG. 2 there is illustrated a block diagram of components of an exemplary right channel of a headphone system in accordance with an embodiment of the invention.
  • the system includes both a right noise reduction microphone 200 and a left noise reduction microphone (not shown).
  • Right noise reduction microphone 200 may be mounted in or about right headphone 22 (Fig. 1) as is typically provided.
  • the ambient noise signal output by right noise reduction microphone 200 is coupled to microphone amplifier 210.
  • Microphone amplifier 210 may be located in control box 50, so that cable 30 of Fig. 1 carries the connection from the output of right noise reduction microphone 200 to microphone amplifier 210.
  • Microphone amplifier 210 may be any one of a large number of amplifiers well known in connection with audio systems and devices, and provides as an output an amplified signal.
  • a non-inverting amplifier may be employed.
  • the output of microphone amplifier 210 is coupled to an input of level setting circuit 212.
  • Level setting circuit 212 adjusts the levels of signals received from microphone amplifier, and may have fixed settings, or may be coupled to a user input.
  • Level setting circuit 212 may include a potentiometer, by way of example.
  • the output of level setting circuit 212 is coupled to an input of switch 260.
  • Switch 260 is operatively coupled to a user input, such as active filter selector 54 shown in Fig. 1. Using active filter selector 54 to operate switch 260, the user may select one of noise reduction filters 250, 252, 254, or a direct connection, as at 262, in which case no active noise reduction filter is provided.
  • Each of noise reduction filters 250, 252, 254 is an active noise reduction filter.
  • An active noise reduction filter provides, over at least a portion of the frequency range of a received signal, a generated signal that is, or is similar to, an inverted and phase- shifted copy of the received signal, so that addition of the signals results in an output signal having a reduced amplitude over at least a portion of the frequency range of the received signal. It will be appreciated that a filter constitutes an active noise reduction filter notwithstanding the fact that the generated signal is not perfectly opposite in phase, or a perfect inverse of the received signal.
  • Active noise reduction is known by a variety of terms, including active noise cancellation, active noise control, and active noise compensation, and the term “active noise reduction” as used herein encompasses the same technique denoted by these and similar terms.
  • the filters are each directed to particular frequency bands, which bands may be selected for various environments, as discussed in more detail below.
  • the output of switch 261 is a filtered signal which is coupled to an input of buffer 265.
  • Buffer 265 may provide buffering of the filtered signal.
  • the output of buffer 265 is a buffered, filtered signal.
  • Jack 270 of a cable (not shown), provides left audio source material signals at 272 and right audio source material signals at 274.
  • Left audio source material signals are coupled to a left channel, and processed in a manner similar to that of the right channel and is not shown.
  • Right audio source material signals are coupled to an input of a volume control circuit 275, which is operatively coupled to a user volume selector.
  • Volume adjusted right audio source material signals and buffered filter signal both inputs to amplifier 280, which additively combines and amplifies the signals.
  • Amplifier 280 outputs a combined amplified signal to drive right speaker 290.
  • the block diagram shown in Fig. 2 is merely exemplary and additional signal conditioning and processing devices and steps may be included in a circuit implementing the invention. Moreover, the particular order of inclusion of devices in a circuit implementing the invention may be varied.
  • the filters may be implemented in one or more digital signal processors.
  • the ambient noise signal received from the microphone may be converted into a digital noise signal by an analog-to-digital converter.
  • the DSP system may perform a discrete Fourier transform on the digital noise signal to obtain the spectra and amplitudes of the ambient noise.
  • the user may select one of a plurality of digital filters that provide filtering of the signal within a particular frequency band.
  • the digital signal in the frequency domain is passed through the selected one of the filters; the filtered signal is inversely transformed into the time domain; the filtered signal in time domain is inverted by an inverter; the inverted signal is converted to an analog signal by a digital to analog converter, and the converted analog signal is then sent to a summing amplifier.
  • the passed signal may also be inverted.
  • the inverted signal is added to an input audio signal, and the summed signal is used to drive a speaker.
  • the filters implemented by the digital signal processor can be HR or FIR filters as known in the art.
  • the system can be implemented in a digital signal processor.
  • the analog-to-digital conversion, discrete Fourier transform calculation, applied filter, and summing function can all be performed in a DSP integrated circuit.
  • the received ambient noise is converted into a digital signal, transformed into the frequency domain, and filtered by the selected one of the filters.
  • the filtered frequency domain signal is inversely transformed to the time domain, inverted, and converted to an analog signal, as described above for using a digital signal processor.
  • One or more analog programmable filter arrays may be used, which arrays are suitably programmed to provide filtering in the selected frequency bands. If an analog programmable filter array is used, no analog to digital converter, digital to analog converter, or transformation between the time domain and the frequency domain is needed.
  • the programmable array may include at least two filters, each having a particular frequency band in which the signal is filtered.
  • the inventors have discovered that noise characteristics of different common transportation environments vary.
  • the noise detected in a coach of an inter-city passenger train and in particular in a coach of a French National Railways TGV, has a noise peak near 100 Hertz (Hz).
  • the noise detected in a cabin of a jet passenger aircraft, and in particular a Boeing 747 during takeoff and landing has a peak near 200 Hz.
  • the noise in a carriage of an urban rail system, and in particular the Paris Metro has noise peaks at about 300 Hz and about 800 Hz. Desirable characteristics of filters suitable for use in a jet aircraft passenger cabin, an inter-city passenger railroad coach, and an urban rail transit car, are provided.
  • An indicator may be provided in connection with control box 50 to identify to a user which filter is selected by manipulation of selector 54.
  • Indicia may be provided adjacent each position on a selector 54.
  • the indicia may be wording such as METRO, PLANE, TRAIN.
  • Another example of indicia is pictograms representing a metro, an airplane, and an intercity train, respectively. Any other suitable indicator technology, such as an LCD or other alphanumeric display, may be employed.
  • Each noise reduction filter 250, 252, 254 provides active noise reduction in a selected frequency band.
  • First noise reduction filter 250 provides active noise reduction in a first selected frequency band.
  • the first selected frequency band corresponds to observed noise in a first environment.
  • the first environment may be, for example, an inter-city passenger railroad coach during operation at normal speeds.
  • Second noise reduction filter 252 provides active noise reduction in a second selected frequency band.
  • the second selected frequency band corresponds to observed noise in a second environment different from the first environment.
  • the second environment may be, for example, an aircraft passenger cabin during flight.
  • the aircraft may be a high-capacity passenger jet aircraft commonly used by airlines, with the cabin configured for passenger travel with rows of cushioned seats.
  • Third noise reduction filter 254 provides active noise reduction in a third selected frequency band.
  • the third selected frequency band corresponds to observed noise in a third environment different from the first and second environments.
  • the third environment may be, for example, a car of an urban subway, elevated or metro transit system in operation.
  • filters corresponding to additional environments may be provided in addition to or in lieu of one or more of the disclosed filters.
  • Such filters may correspond to other noise-specific frequency environments, including but not limited to other modes of transportation, such as buses and light rails, or other noisy environments.
  • Figs. 3A, 3B and 3C desirable characteristics of bandpass filters in an implementation of the invention in which filters suitable for use in a jet aircraft passenger cabin, an inter-city passenger railroad coach, and an urban rail transit car, are provided.
  • Fig. 3A noise levels in decibels are plotted against frequency, in Hertz. Both values are plotted on a logarithmic scale.
  • An exemplary detected noise signal for a jet aircraft passenger cabin is shown at 302.
  • An exemplary noise signal for a jet aircraft passenger cabin after active noise reduction in accordance with an embodiment of the invention is shown at 304.
  • Noise reduction is provided in a frequency band around 200 Hz.
  • a noise reduction peak at about 200 Hz, of about 20 decibels (dB), is indicated at 306.
  • Noise reduction at a non-peak frequency about 180 Hz, is shown at 308.
  • Noise reduction at a non-peak frequency about 210 Hz, is shown at 310.
  • Noise reduction at 308 and 310 is at least about 15 dB. It will be appreciated that the particular depth and width of the noise reduction band may vary in implementations of the invention. In the areas surrounding the noise reduction peaks, for example, the higher frequencies, noise reduction may be provided by additional elements of the headphone, for example, by padding provided on the headsets.
  • An exemplary detected noise signal with and without exemplary active noise reduction in accordance with an embodiment of the invention is shown for the interior of a coach of an inter-city train at Fig. 3B. Noise levels in decibels are plotted against frequency, in Hertz.
  • An exemplary detected noise signal for the interior of a coach of an inter-city train is shown at 322.
  • An exemplary noise signal for the interior of a coach of an inter-city train is shown at 324.
  • Noise reduction at about 100 Hz, of about 20 dB, is indicated at 326.
  • Noise reduction at a non-peak frequency, about 80Hz, is shown at 328.
  • Noise reduction at a non-peak frequency, about 110 Hz, is shown at 330.
  • Noise reduction at 328 and 330 is at least about 15 dB. It will be appreciated that the particular depth and width of the noise reduction band may vary in implementations of the invention. As in Fig.
  • noise reduction may be provided by additional elements of the headphone, for example, by padding provided on the headsets.
  • An exemplary detected noise signal with and without exemplary active noise reduction in accordance with an embodiment of the invention is shown for the interior of a car of an urban rail transit system at Fig. 3C. Noise levels in decibels are plotted against frequency, in Hertz. Both values are plotted on a logarithmic scale.
  • An exemplary detected noise signal for the interior of a coach of an inter-city train is shown at 332.
  • An exemplary noise signal for the interior of a coach of an inter-city train is shown at 334.

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  • Acoustics & Sound (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Signal Processing (AREA)
  • Biophysics (AREA)
  • Vascular Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Psychology (AREA)
  • Otolaryngology (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention concerne un système d'écouteurs équipé d'un microphone permettant de recevoir du bruit; un premier filtre pour produire une correction active du bruit reçu pour l'écouteur dans une première bande de fréquence, un second filtre pour produire une correction active du bruit dans une seconde bande de fréquence; et un sélecteur commandé par l'utilisateur qui permet de choisir l'un ou l'autre du premier ou du second filtres.
PCT/US2005/025061 2005-07-14 2005-07-14 Ecouteurs a filtre choisi par l'utilisateur pour suppression active du bruit WO2007011337A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2005/025061 WO2007011337A1 (fr) 2005-07-14 2005-07-14 Ecouteurs a filtre choisi par l'utilisateur pour suppression active du bruit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2005/025061 WO2007011337A1 (fr) 2005-07-14 2005-07-14 Ecouteurs a filtre choisi par l'utilisateur pour suppression active du bruit

Publications (1)

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WO2007011337A1 true WO2007011337A1 (fr) 2007-01-25

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Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011161487A1 (fr) * 2010-06-21 2011-12-29 Nokia Corporation Appareil, procédé et programme informatique d'annulation réglable du bruit
EP2677765A1 (fr) 2012-06-20 2013-12-25 AKG Acoustics GmbH Casque à suppression active de bruit
US20150112671A1 (en) * 2013-10-18 2015-04-23 Plantronics, Inc. Headset Interview Mode
WO2014168685A3 (fr) * 2013-04-10 2015-06-25 Cirrus Logic, Inc. Systèmes et procédés de suppression adaptative du bruit de noeuds multiples pour casques audio
US9264808B2 (en) 2013-06-14 2016-02-16 Cirrus Logic, Inc. Systems and methods for detection and cancellation of narrow-band noise
US9294836B2 (en) 2013-04-16 2016-03-22 Cirrus Logic, Inc. Systems and methods for adaptive noise cancellation including secondary path estimate monitoring
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
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
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
US9369557B2 (en) 2014-03-05 2016-06-14 Cirrus Logic, Inc. Frequency-dependent sidetone calibration
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