WO2007054807A2 - Noise cancellation earphone - Google Patents
Noise cancellation earphone Download PDFInfo
- Publication number
- WO2007054807A2 WO2007054807A2 PCT/IB2006/003179 IB2006003179W WO2007054807A2 WO 2007054807 A2 WO2007054807 A2 WO 2007054807A2 IB 2006003179 W IB2006003179 W IB 2006003179W WO 2007054807 A2 WO2007054807 A2 WO 2007054807A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- earphone
- canal
- auricle
- noise cancellation
- acoustic
- Prior art date
Links
- 238000011084 recovery Methods 0.000 claims description 6
- 230000001629 suppression Effects 0.000 claims description 5
- 230000001419 dependent effect Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 230000004044 response Effects 0.000 description 10
- 210000000613 ear canal Anatomy 0.000 description 5
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 210000003027 ear inner Anatomy 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
-
- 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
-
- 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
- G10K11/1787—General system configurations
- G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure 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
- G10K11/1787—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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
-
- 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
-
- 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
- H04R1/1016—Earpieces of the intra-aural type
-
- 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
- This invention relates to earphones and has particular application to earphone apparatus having a sound transducer adapted for location directly in or adjacent to the human auditory canal.
- the invention also relates to noise cancellation systems and has application to an ear phone assembly for use in conjunction with, or as part of, a noise cancellation system
- Noise cancellation headphones provide the wearer with an ability to listen to sound free from the disturbing effects of background noise. Noise cancellation headphones are used widely in commercial passenger aircraft and general aviation and are now experiencing adoption in the mainstream in a variety of consumer audio applications.
- Noise cancellation headphones are also configured in circum aural or supra aural arrangements. Circum aural noise cancellation headphones, however, tend to provide a better overall noise suppression effect as the complete seal provided by the ear pad insulates the ear from the higher frequencies of sound which are more difficult to reduce by active noise cancellation techniques.
- Headphones whether passive or active noise cancellation, are typically large and comprise a headband that can either be worn on top of the head or behind the neck. Headphones can be clumsy, uncomfortable and space consuming, especially for those who travel frequently.
- An alternative solution for the personal reproduction of sound is an earphone such as an "ear bud" which is placed directly in or adjacent to the auditory canal.
- earphones generally comprise one or two small audio transducers that are placed directly in or adjacent to the auditory canal.
- Earphones are used widely with hands-free cellular phone kits and portable audio devices such as mp3 and DVD players.
- a feed forward active noise cancellation system is relatively simple in that it relies on a reference signal to generate a control response; this reference signal being somehow related to the signal requiring control.
- reference signal In the case of a feed forward earphone active noise cancellation solution, the best choice of reference signal is a measure of the ambient noise directly outside of the earphone's seal against the ear.
- This reference signal obtained by way of a microphone transducer, is processed by noise cancellation electronic circuitry (filters) to generate an appropriate control response.
- the circuitry is designed to replicate the dynamic behaviour of the acoustic system between the reference measurement and control positions. All things being equal, the control response, once output via the earphone's speaker will effect cancellation of the noise that has infiltrated the ear canal.
- a feed forward controller is 'dumb' in the sense that it does not have any measure of its own performance. It relies on a prior knowledge of the disturbance (noise) and the acoustic system.
- the reference signal is not fully representative of the noise that actually penetrates the earphone's seal and enters the auditory canal.
- the maximum performance of a feed forward active noise cancellation system can be calculated mathematically by measuring the coherence between the reference signal and the sound that penetrates the ear canal. This can be significantly less than unity, especially where the ear bud does not present a tight seal around the ear canal or the acoustics of the ear canal varies from that measured to determine the control filters.
- a feedback control configuration relies on an error measurement located downstream from the point of control. The error represents a logical difference between a desired outcome and the measured result.
- controllers for present consumer earphone products are size, weight and power constraints. For example, when being used in conjunction with a portable MP3 player a controller needs to be small and light enough to be worn as a medallion, and typically needs to operate off a 1.5 to 3 volt battery power supply. Therefore the controller order, driving voltage swing and available power are very limited. This also makes it important to provide a solution that reduces the demands placed on the controller.
- the invention broadly consists in an earphone for an active noise reduction system, the earphone having an auricle portion adapted to be received in the auricle of a human ear, and a canal portion adapted to be received in the auditory canal of the ear, the auricle portion having a speaker and a microphone provided anteriorly of the speaker, the canal portion being rotatably mounted relative to the auricle portion such that the canal portion can be angularly adjusted relative to the auricle portion dependent on the ear geometry of a user to allow the canal portion to be received in the auditory canal and the auricle portion to be supported in the auricle.
- the assembly includes a locking means which may be activated to prevent adjustment of the canal portion relative to the auricle portion.
- the locking means may be selectively deactivated to allow adjustment of the canal portion relative to the auricle portion.
- the canal portion is received in the entrance to the auditory canal.
- the canal portion is received in the auditory canal so as to make an effective acoustic seal between the canal portion and the auditory canal.
- the canal portion is mounted eccentrically relative to the auricle portion.
- the canal portion has a central axis disposed at an angle to a central axis of the auricle portion.
- the auricle portion includes an acoustic transducer for producing sound in response to an electrical signal.
- the auricle portion includes a microphone.
- the microphone is located anteriorly of the acoustic transducer.
- the canal portion includes a tubular acoustic path, and one or both of the auricle portion and the canal portion provide a cavity upstream of the tubular acoustic path such that the cavity and the tubular acoustic path form a resonator having a desired resonant characteristic.
- the invention broadly consists in an earphone for use with the noise cancellation system, the earphone including an acoustic transducer for producing sound in response to an electrical signal, and a microphone located anteriorly of the acoustic transducer.
- the invention broadly consists in an earphone assembly comprising a carrier which carries an acoustic transducer for producing sound in response to an electrical signal, and carries a microphone, the carrier being adapted to be retained within a suitable housing.
- the housing comprises a first component having a stem dependent therefrom, and a second component which is adapted to be received in the auricle of an ear.
- the invention broadly provides an earphone feedback noise cancellation system including an ear bud earphone having an acoustic transducer for producing sound in response to an electrical signal and a microphone, and feedback noise cancellation circuitry adapted to receive a feedback signal from the microphone and provide an appropriate signal to the acoustic transducer to in use provide noise suppression.
- the invention broadly provides an earphone having a housing, the housing including an acoustic outlet and at least a part of the housing adjacent to the acoustic outlet being adapted to be received in an ear canal, a speaker driver provided in the housing, an acoustic path from the driver through a pipe to the acoustic outlet, and wherein the construction is such that a resonance occurs at a predetermined frequency or over a predetermined frequency range.
- the resonance is a Helmholtz resonance.
- a cavity is provided in the acoustic path between the driver and the pipe.
- the resonance allows a phase recovery to occur.
- the pipe comprises an elongate or tubular acoustic path.
- the predetermined frequency is approximately 500Hz - 1kHz.
- the invention provides an earphone feedback noise cancellation system including an earphone as set forth in the preceding statement of invention, and feedback noise cancellation circuitry adapted to receive a feedback signal from the microphone and provide an appropriate signal to the speaker in use provide noise suppression.
- Figure 1 which is a plan view of a feedback controlled noise cancellation system including an earphone assembly
- Figure 2 which is a perspective view of two earphone assemblies
- FIG 3 which is an exploded perspective view of one of the earphone assemblies of figure 2
- Figure 4 which shows the features of figure 3 in greater detail which support adjustable interconnection between an auricle portion of the earphone assembly and a canal portion of that assembly
- FIG. 5 which is a rear elevation of an earphone according to Figure 2
- Figure 7a which is a block diagram representative of a cross-section of an earphone according to the invention located in an auditory canal;
- Figure 7b which is an illustrative plot of the transfer function gain against frequency (Hz) for the open loop acoustic plant, showing the effect of a phase recovery
- Figure 7c which is an illustrative plot of phase against frequency (Hz) for the open loop acoustic plant, showing the phase recovery provided by design of the earphone;
- Figure 8 which is a diagrammatic cross-section of an earphone assembly according to the present invention within the auditory canal of a human ear
- FIG. 9 is a simplified block diagram of a feedback noise cancellation control system according to the invention.
- Figure 10 is a plot of the magnitude of the error signal (dB) against frequency (Hz).
- the invention includes one or more (most preferably two) ear bud earphone assemblies which are generally referenced 1 , and which are electrically connected to the noise cancellation system controller which is generally referenced 2.
- the controller takes the form of a medallion in one embodiment, but those skilled in the art will appreciate that a controller could be provided remote from the overall assembly, for example being provided in an audio player.
- the controller may be provided in the arm rest of the seat of a passenger vehicle, such as an aircraft.
- the controller 2 may be provided in a housing which includes a power supply such as a battery. Alternatively, power could be provided from a remote source, the appropriate electrical connections being made via plug 3.
- plug 3 comprises an audio plug which is used to receive an audio signal for delivery to the earphones 1 , and the noise cancellation controller 2 receives a feedback signal from a microphone (described further below) in each of the earphone assemblies so that the signal provided to the acoustic transducer in each earphone substantially cancels unwanted disturbance noise from the sound delivered to the user.
- each earphone includes a first part generally referenced 4 which is adapted to the received in the pinna or auricle of a human ear adjacent to the entrance to the auditory canal, and which is referred to in this description as an auricle portion of the earphone assembly.
- a second part generally referenced 6 is adapted for location within the auditory canal of the human ear, typically at or near the entrance to the auditory canal.
- a stem 7 is provided which receives and guides the electrical cables that allow the appropriate signals to be passed between the controller 2 and the earphone 1.
- a carrier 14 provides a sub frame for receiving an acoustic transducer such as speaker 15, which may also be referred to as a driver, and for supporting and carrying a further transducer, being a microphone 35.
- Carrier 14 provides a convenient and simple way to support the electromechanical components, while also allowing them to be easily removed or replaced if required.
- the driver 15 exhibits appropriate gain and phase characteristics in a very small diameter. This is achieved by ensuring that the volume and damping conditions are appropriate.
- An o-ring 16 is provided in a preferred embodiment to ensure an acoustic seal is present between the carrier and housing part 5.
- the microphone 35 is also designed with particular characteristics, mainly an effective low frequency response.
- the microphone is selected to ensure that the phase response of the microphone drops as close to zero as possible.
- the canal portion comprises a housing part 18 from which extends a pipe 20 which provides an acoustic transmission path.
- a seal such as a grommet or "mushroom” seal 21 is provided.
- Seal 21 is made from a flexible resilient material, for example silicone.
- a coupling seal 22 assists in acoustic coupling between the housing part 5 and housing part 18 so that the parts may be moved relative to each other as described further below without compromising acoustic performance.
- Figure 4 shows further detail of the front end 24 of housing component 5, and a rear end 26 of housing component 18.
- the front end 24 has a plurality of teeth which form recesses 28 about a peripheral surface, and these can engage with projecting pins 30 provided on an inner surface of end 26 upon the components being pressed together in an axial direction so that the components are frictionally engaged with each other. Therefore, a user may pull housing part 18 away from housing part 5, then rotate the parts relative to each other in a plane perpendicular to the acoustic transmission path through the earphone to provide an adjustment (as will be described to the below), and then push them together again in an axial direction to lock the selected adjusted components in place.
- the recesses 28 and pins 30 may be designed such that the parts may be frictionally engaged whereby they may be rotated relative to each other yet there is sufficient friction between the parts to enable them to remain in the desired orientation in use, so that a separate locking mechanism is not required.
- the pipe 20 may be mounted eccentrically relative to the remainder of housing part 18. Therefore, rotation of the housing part 18 relative to the housing part 5 (that is to say rotation of the canal portion of the assembly relative to the auricle portion) provides an adjustment mechanism to ensure that the seal 21 of the canal portion is correctly received within the auditory canal while the auricle portion is supported in the auricle of the ear.
- the geometry of the human ear varies from one individual to another, but the auditory canal is typically disposed at an angle to the auricle. Therefore, allowing the position of the part 18 to be adjusted relative to part 5 is advantageous because the varying geometries can thus be accommodated. This allows a comfortable and correct fit to be achieved. A correct fit is essential for proper use to allow maximum passive and active noise cancellation.
- the central axis 32 of the canal portion may be angularly displaced relative to a central axis 34 of the auricle portion, such that the relative angle between the axes may be adjusted by rotation of the two portions.
- the integrity of the internal acoustic seal 22 is maintained so that performance is not compromised by adjustment of the housing parts.
- Figure 6 also shows a preferred location for the microphone 35, and the manner in which the microphone is supported in carrier 14. It will be seen that the microphone 35 is provided forwardly i.e. anteriorly of the driver 15 to detect any acoustic disturbances within the earphone assembly. In the embodiment shown the microphone 35 is supported in the carrier 14 so that it is directed toward the auditory canal. The acoustic path within the earphone assembly extends from the driver, past microphone 35, and on into cavity 36 formed between housing parts 5 and 18 (i.e. between the auricle portion and the canal portion of the assembly) after which it extends through pipe 20 to exit the apparatus into the auditory canal.
- housing parts 5 and 18 i.e. between the auricle portion and the canal portion of the assembly
- the earphone 1 is designed to include a resonator or oscillator which has the effect of recovering the open loop system phase characteristics to extend the bandwidth over which active noise cancellation is effected and to improve the relative stability of the closed loop. This enables an increase in feedback gain and thus the level of noise cancellation which is achieved. This allows the controller to be kept relatively simple while still achieving effective noise cancellation without instability.
- the resonator may be viewed as a Helmholtz resonator, and in a preferred embodiment is designed to create a resonance at a frequency band of approximately 500Hz-IkHz which has the effect of recovering the phase information in order to reduce the constructive interference of the system and as a result limits the amplification of the background noise created by the system.
- V volume of the container (i.e. of the auditory canal cavity)
- An impedance change at the opening of the pipe 20 nearest the driver 15 is necessary to prevent the pipe otherwise appearing acoustically as an endless tube.
- the impedance change is achieved by having a sudden change in the diameter of the exit of the pipe 20 to the internal cavity 36 between the driver 15 and the pipe 20.
- the microphone 15 is positioned near the open end of the pipe 20 in order to pick up the resonance.
- the resonance that begins around 500Hz provides a phase recovery and this in turn extends the gain which assists with designing a controller that achieves improved active noise reduction performance.
- Loci 50 and 52 illustrate use of the resonator, and loci 51 and 53 show the effect without the resonator.
- IEC standard 711-1981 for the internal ear may be used to test and/or simulate earphone performance.
- the earphone assembly described above is shown diagramatically in cross-section positioned within an auditory canal 40 and auricle 42.
- the flexible outer surfaces of the mushroom seal 21 make an effective acoustic seal with inner surfaces of the auditory canal to prevent the incursion of extraneous sound to create a closed controllable system whilst also minimising the transmission into the auditory canal of extraneous sound. Therefore there is maximum passive attenuation of acoustic disturbances which originate exteriorly of the earphone assembly.
- control law may be implemented using known techniques as described in the prior art.
- an earphone assembly which allows a feedback noise cancellation system to be used with a simple and inexpensive controller without stability problems because the earphone is designed to acoustically achieve a phase recovery.
- the control law utilised is of as low an order as possible, is power efficient and does not require a substantial voltage swing.
- the assembly has significant advantages in being adjustable to suit the geometry of a user's ear while also providing an effective acoustic seal with the auditory canal.
- the assembly is also simple and easy to manufacture, and is easily assembled or disassembled.
- the modular nature of the electromechanical transducer arrangement means that these components are easily placed within the earphone assembly, and are easily removed if required.
- the feedback control system that is provided allows very effective noise rejection.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112006002866.9T DE112006002866B4 (en) | 2005-11-11 | 2006-11-13 | Noise canceling headphones |
GB0810560A GB2446548B (en) | 2005-11-11 | 2006-11-13 | Earphone and noise cancellation system |
US12/084,863 US8571227B2 (en) | 2005-11-11 | 2006-11-13 | Noise cancellation earphone |
JP2008539531A JP5265373B2 (en) | 2005-11-11 | 2006-11-13 | Noise elimination earphone |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ543567 | 2005-11-11 | ||
NZ543567A NZ543567A (en) | 2005-11-11 | 2005-11-11 | Earphone and noise cancellation system |
NZ545244 | 2006-02-09 | ||
NZ54524406 | 2006-02-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2007054807A2 true WO2007054807A2 (en) | 2007-05-18 |
WO2007054807A3 WO2007054807A3 (en) | 2007-08-30 |
Family
ID=38023633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2006/003179 WO2007054807A2 (en) | 2005-11-11 | 2006-11-13 | Noise cancellation earphone |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE112006002866B4 (en) |
GB (1) | GB2446548B (en) |
WO (1) | WO2007054807A2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008049932A1 (en) | 2007-10-02 | 2009-05-28 | Phitek Systems Ltd. | Component for headphones with noise cancellation |
JP2009153103A (en) * | 2007-10-02 | 2009-07-09 | Phitek Systems Ltd | Component for noise reducing earphone |
WO2011025837A1 (en) * | 2009-08-25 | 2011-03-03 | Molex Incorporated | Earphone |
WO2011061483A3 (en) * | 2009-11-23 | 2011-08-11 | Incus Laboratories Limited | Production of ambient noise-cancelling earphones |
WO2011154808A3 (en) * | 2010-06-08 | 2012-03-08 | Music Group Ip, Ltd. | System and method for increasing a feedback detection rate in an audio system |
WO2017218186A1 (en) * | 2016-06-14 | 2017-12-21 | Bose Corporation | Feedback microphone adaptor for noise canceling headphone |
CN107864418A (en) * | 2012-05-25 | 2018-03-30 | 伯斯有限公司 | In-Ear active noise reduces earphone |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090232342A1 (en) * | 2008-03-14 | 2009-09-17 | Hearing Components, Inc. | Earbud adapter with increased flexibility region |
DE102009005302B4 (en) | 2009-01-16 | 2022-01-05 | Sennheiser Electronic Gmbh & Co. Kg | Protective helmet and device for active noise suppression |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4311206A (en) * | 1978-05-15 | 1982-01-19 | Johnson Rubein V | Hearing aid ear mold with improved discrimination |
US5333622A (en) * | 1990-08-20 | 1994-08-02 | The Center For Innovative Technology | Earplug and hearing devices formed in-situ |
WO2002084982A2 (en) * | 2001-04-12 | 2002-10-24 | Innotalent Holdings Limited | Radio/telephone ear-piece |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3540579A1 (en) * | 1985-11-15 | 1987-05-27 | Toepholm & Westermann | IN-EAR HOERING DEVICE |
FR2604551B1 (en) * | 1986-09-26 | 1988-12-30 | Saint Louis Inst | NOISE PROTECTION DEVICE |
US4985925A (en) | 1988-06-24 | 1991-01-15 | Sensor Electronics, Inc. | Active noise reduction system |
ITGE940067A1 (en) * | 1994-05-27 | 1995-11-27 | Ernes S R L | END HEARING HEARING PROSTHESIS. |
DK42297A (en) * | 1997-04-15 | 1998-10-16 | Toepholm & Westermann | Waiting system for in-ear hearing aid |
JP2000059876A (en) * | 1998-08-13 | 2000-02-25 | Sony Corp | Sound device and headphone |
US6084976A (en) | 1999-06-11 | 2000-07-04 | Lin; Chung-Yu | Earphone without impulse noise and conductive hearing loss |
US7212646B2 (en) * | 2002-09-30 | 2007-05-01 | Shary Nassimi | Adjustable ear canal retention transceiver/receiver |
-
2006
- 2006-11-13 DE DE112006002866.9T patent/DE112006002866B4/en active Active
- 2006-11-13 WO PCT/IB2006/003179 patent/WO2007054807A2/en active Application Filing
- 2006-11-13 GB GB0810560A patent/GB2446548B/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4311206A (en) * | 1978-05-15 | 1982-01-19 | Johnson Rubein V | Hearing aid ear mold with improved discrimination |
US5333622A (en) * | 1990-08-20 | 1994-08-02 | The Center For Innovative Technology | Earplug and hearing devices formed in-situ |
WO2002084982A2 (en) * | 2001-04-12 | 2002-10-24 | Innotalent Holdings Limited | Radio/telephone ear-piece |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008049932A1 (en) | 2007-10-02 | 2009-05-28 | Phitek Systems Ltd. | Component for headphones with noise cancellation |
JP2009153103A (en) * | 2007-10-02 | 2009-07-09 | Phitek Systems Ltd | Component for noise reducing earphone |
US8666085B2 (en) * | 2007-10-02 | 2014-03-04 | Phitek Systems Limited | Component for noise reducing earphone |
WO2011025837A1 (en) * | 2009-08-25 | 2011-03-03 | Molex Incorporated | Earphone |
WO2011061483A3 (en) * | 2009-11-23 | 2011-08-11 | Incus Laboratories Limited | Production of ambient noise-cancelling earphones |
WO2011154808A3 (en) * | 2010-06-08 | 2012-03-08 | Music Group Ip, Ltd. | System and method for increasing a feedback detection rate in an audio system |
CN107864418A (en) * | 2012-05-25 | 2018-03-30 | 伯斯有限公司 | In-Ear active noise reduces earphone |
EP3086567B1 (en) | 2012-05-25 | 2018-07-18 | Bose Corporation | In-ear active noise reduction earphone |
US10206033B2 (en) | 2012-05-25 | 2019-02-12 | Bose Corporation | In-ear active noise reduction earphone |
CN107864418B (en) * | 2012-05-25 | 2020-08-07 | 伯斯有限公司 | In-ear active noise reducing earphone |
WO2017218186A1 (en) * | 2016-06-14 | 2017-12-21 | Bose Corporation | Feedback microphone adaptor for noise canceling headphone |
US10015581B2 (en) | 2016-06-14 | 2018-07-03 | Bose Corporation | Feedback microphone adaptor for noise canceling headphone |
Also Published As
Publication number | Publication date |
---|---|
GB2446548A (en) | 2008-08-13 |
GB2446548B (en) | 2010-06-23 |
GB0810560D0 (en) | 2008-07-16 |
DE112006002866T5 (en) | 2008-10-09 |
DE112006002866B4 (en) | 2018-05-09 |
WO2007054807A3 (en) | 2007-08-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8571227B2 (en) | Noise cancellation earphone | |
US20230109699A1 (en) | Acoustic device | |
WO2007054807A2 (en) | Noise cancellation earphone | |
US8666085B2 (en) | Component for noise reducing earphone | |
EP3516883B1 (en) | In-ear active noise reduction earphone | |
EP2856771B1 (en) | In-ear active noise reduction earphone | |
JP3038243B2 (en) | Sound permeable earphones | |
JP2989843B2 (en) | Active noise reduction system | |
JP6600075B2 (en) | Noise reduction with in-ear headphones | |
US9269342B2 (en) | In-ear active noise reduction earphone | |
US20160381454A1 (en) | Ear Defender With Concha Simulator | |
EP3188500B1 (en) | Noise-canceling concha headphone | |
WO2019017036A1 (en) | Sound output device | |
JP2002515197A (en) | Earphone with eyeglass attachment | |
WO2019205049A1 (en) | Vibration removal apparatus and method for dual-microphone earphones | |
US20140233754A1 (en) | Headphone system with retractable microphone | |
US20070237349A1 (en) | Earbud earphone and cushion therefor | |
US8559649B2 (en) | Sleep-aide device | |
GB2453434A (en) | Noise reducing module for earphones | |
US11523230B2 (en) | Earpiece with moving coil transducer and acoustic back volume | |
NZ543567A (en) | Earphone and noise cancellation system | |
NZ569489A (en) | Earphone and noise cancellation system | |
CN115914913A (en) | Sound output device | |
GB2424536A (en) | In-ear earphone with cushioning | |
NZ539051A (en) | Noise cancellation ear bud earphone with two-part cushion |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
DPE1 | Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101) | ||
ENP | Entry into the national phase |
Ref document number: 2008539531 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 0810560 Country of ref document: GB Kind code of ref document: A Free format text: PCT FILING DATE = 20061113 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 0810560.3 Country of ref document: GB |
|
RET | De translation (de og part 6b) |
Ref document number: 112006002866 Country of ref document: DE Date of ref document: 20081009 Kind code of ref document: P |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112006002866 Country of ref document: DE |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 06831566 Country of ref document: EP Kind code of ref document: A2 |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 06831566 Country of ref document: EP Kind code of ref document: A2 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12084863 Country of ref document: US |