EP0755166A2 - Dispositif avec compensation active du bruit - Google Patents

Dispositif avec compensation active du bruit Download PDF

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Publication number
EP0755166A2
EP0755166A2 EP96104591A EP96104591A EP0755166A2 EP 0755166 A2 EP0755166 A2 EP 0755166A2 EP 96104591 A EP96104591 A EP 96104591A EP 96104591 A EP96104591 A EP 96104591A EP 0755166 A2 EP0755166 A2 EP 0755166A2
Authority
EP
European Patent Office
Prior art keywords
membrane
transducer
volume
compliance
noise compensation
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.)
Granted
Application number
EP96104591A
Other languages
German (de)
English (en)
Other versions
EP0755166B1 (fr
EP0755166A3 (fr
Inventor
Volker Bartels
Burkhard Markmann
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.)
Sennheiser Electronic GmbH and Co KG
Original Assignee
Sennheiser Electronic GmbH and Co KG
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 Sennheiser Electronic GmbH and Co KG filed Critical Sennheiser Electronic GmbH and Co KG
Publication of EP0755166A2 publication Critical patent/EP0755166A2/fr
Publication of EP0755166A3 publication Critical patent/EP0755166A3/fr
Application granted granted Critical
Publication of EP0755166B1 publication Critical patent/EP0755166B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • Noise is one of the worst environmental impacts and a serious stress factor. Research has shown that noise affects the autonomic nervous system. The result is fatigue, lack of concentration, nervousness and irritability. In addition, constant exposure to noise leads to permanent hearing damage.
  • the sound wave incident on the ear is fed to a filter for 180 ° shift and the phase-shifted sound is emitted via a transducer.
  • Noise reduction of more than 15 dB can be achieved.
  • a noise reduction of 10 dB is perceived subjectively as halving the volume.
  • Such headphones with active noise compensation have been available on the market for some years, e.g. B. under the name "NoiseGard®” (trademark of Sennheiser electronic KG) with the type designation HDC 200 "NoiseGard® mobile".
  • the principle of active noise compensation is also, for example, from the documentations DE-A-95134, DE-B-305391, DE-C-71754, DE-C-71534, DE-C-655508, DE-A-3719963, DE-C -40153, DE-U-881597, EP-A-008389, GB-A-147166, GB-A-16074, GB-A-160070, GB-A-09769, GB-C-1530814, DE-A-33498 , DE-A-3137747, DE-151717, EP-A-0461801, US-A-4,736,431, US-A-4,6, 69, US-A-4,494,074, US-4,05,734, US-A-4
  • US-A-5,181,252 discloses a highly complicated headphone converter that is used for an active noise compensation device.
  • the cavity in front of the transducer is separated from the closed cavity behind the transducer by the transducer membrane.
  • the transducer has a membrane that is considerably more flexible than the rear volume or, in other words, the rear volume is significantly stiffer than the rigidity of the membrane of the transducer.
  • Such a ratio of the membrane stiffness to the stiffness of the rear volume is achieved, for example, with a converter membrane which consists of a 40 ⁇ m thick polycarbonate layer.
  • the rear volume thus determines the overall rigidity of the arrangement comprising the transducer and the rear volume.
  • a known device has a relatively low resonance frequency and is not mechanically robust to environmental influences such as pressure and temperature fluctuations, which means that mechanical damage to the transducer is to be feared especially when the active noise compensation device is used under extreme environmental influences, which is precisely what Air traffic is not uncommon.
  • the object is achieved by a device with active noise compensation, the device having a transducer with a transducer membrane which separates the volume in front of the membrane from the volume behind the membrane and the transducer membrane is more rigid than the rear volume.
  • the membrane compliance is less than the compliance of the rear volume, i.e. the membrane is stiffer than the volume behind it, the resonance frequency of the system increases, but this has no negative effects on the overall system and can be compensated for by other measures.
  • the behavior of the transducer overall is determined more by its own membrane than by the volume behind it. This makes the transducer less sensitive to electro-acoustics, but above all it becomes mechanically more robust against environmental influences such as pressure and temperature fluctuations and is therefore better suited for use under extreme conditions.
  • the active noise compensation function as such remains largely unchanged, and the higher resonance of the system also increases the range without phase shifts that are critical for feedback.
  • One way of stiffening the membrane is to build up the membrane from successive laminate layers, preferably from three laminates, namely 60 ⁇ m polycarbonate, followed by a layer of 30 ⁇ m polyurethane, which in turn is followed by a further 60 ⁇ m thick layer of polycarbonate.
  • damping resistor is provided below the membrane to dampen the basic resonance of the membrane. This can be done above all by arranging damping means very close to the membrane, so that the volume between the bead area of the membrane is reduced in relation to the rear volume.
  • the sensitivity can be increased again as far as desired by optimizing the voice coil. Maximizing the product of the specific conductivity and the wire cross-sectional area of the coil of the converter is suitable for this.
  • FIG. 1 shows a section of a headphone with active noise compensation according to the invention.
  • the headphones have a converter 1 with a converter housing 2 and a converter membrane 50, a coil 4 attached to the rear part of the membrane and a coil housing 5.
  • the transducer membrane 50 consists of a central part 6 - called a spherical cap - and a ring 7 - known as a bead - surrounding the spherical cap - for sound generation.
  • the bead also serves for the mechanical suspension of the spherical cap and ensures the deflectability of the spherical cap 6 and the coil 4 attached to it, which plunges into the coil housing 5 as a function of a noise compensation current.
  • the converter housing 2 consists of three interconnected parts, namely resonator 70, which is fastened to a chassis 60, on the rear side of which a cover 120 or a protective cap is arranged.
  • the transducer membrane 50 separates the volume V 1 behind the membrane 50 from the volume V 2 in front of the membrane.
  • the rear volume V 1 is completely closed off by the closed transducer housing, while the front volume V 2 is the one that lies between the transducer membrane 50 and the human ear and is different due to the different physiognomic configurations of the human ear and the human auditory canal.
  • the front volume V 2 is many times larger than the rear volume V 1 .
  • a resonator 30, preferably made of plastic, and an acoustically transparent fabric 40 above it are provided as damping means in order to prevent dust from penetrating into the area of the transducer membrane.
  • damping means are arranged in the rear volume in order to reduce the fundamental resonance of the transducer.
  • the first damping means there is a damping disk 70 made of acoustic silk below the bead at an average distance of about 2 mm.
  • a damping felt ring 80 is provided in the middle part of the rear volume at the passage to the bead area, and an acoustically transparent foam 90, a paper layer 100 and a damping felt 110 are arranged between the damping felt ring 80 and a protective cap 120 of the transducer 2.
  • a tubular rivet 101 is provided below the calotte for holding the coil magnet 102 of the voice coil 5 together and an acoustically open foam 85 for damping the tubular rivet.
  • the transducer has a microphone holder 10 lying on the outside at the front, which receives a microphone whose main microphone axis MA is inclined at an angle of approximately 45 ° to the main transducer axis HA.
  • the mechanical tissue protection 40 is omitted and the resonator 30 is pierced.
  • the microphone picks up the disturbing sound 15 in front of the transducer and converts it into a corresponding electrical signal which is passed on to a circuit which generates a transducer signal which is phase-shifted by 180 ° and which is fed to the coil 5 by a corresponding deflection of the voice coil 4 to create.
  • membranes with laminates of different thicknesses are suitable, e.g. a membrane film made up of three layers with 60 ⁇ m PC, 30 ⁇ m PU, 60 ⁇ m PC.
  • the membrane is now stiffer than the volume V 1 behind it.
  • the structure of the membrane from different laminates has the advantage that the internal damping of the membrane is higher than in the case of a single-layer membrane, which avoids natural resonances.
  • FIG. 3 shows various sound pressure frequency diagrams which show the conditions when different measures are taken.
  • FIG. 3a shows a sound pressure frequency diagram of a known noise compensation converter - see FIG. 4-, which has a resonance frequency f 0 , a sound pressure sensitivity P 01 below the resonance frequency and a sound pressure sensitivity P 02 above the resonance frequency.
  • the membrane compliance N M is less than the compliance N 1 of the rear volume V 1 , that is, ⁇ ⁇ 1
  • the resonance frequency increases to f 0 'and P 01 ', that is, the sensitivity below the resonance frequency drops below P 01 , as shown in Figure 3b. If the dynamic mass of the transducer is now increased - see FIG. 3c - the resonance frequency drops to the old value, but there is a pronounced increase in the fundamental resonance, and the sensitivity above the resonance frequency drops, ie P 02 ' ⁇ P 02 .
  • the damping resistance below the membrane can be increased, which is best done by arranging the first damping means in the form of acoustic silk below the bead relatively close to the bead, whereby the desired conditions - Figure 3d - re-adjust, however entire membrane has increased robustness and is therefore more suitable for use under extreme conditions.
  • the above explanations show that as the membrane stiffness increases, so that ⁇ ⁇ 1, the resonance frequency of the transducer system increases and, at the same time, the sensitivity falls below the resonance frequency.
  • the resonance frequency of the transducer system is determined by the mass of the system consisting of membrane and voice coil and its spring stiffness.
  • the resonance frequency can be set to the desired value by the dynamic mass of the transducer system, an increase in the dynamic mass of the transducer system leading to a reduction in the resonance frequency.
  • the damping resistance below the membrane can be increased, which can be done by the damping disk 70 below the bead 7, as shown in FIG.
  • the sensitivity below and above the resonance frequency can finally be set to the required value - FIG. 3e.
  • the sensitivity of the coil and thus of the entire converter can be set to the required value by maximizing the expression ⁇ ⁇ A.
  • FIG. 4 shows a converter arrangement as has been available on the market for several years.
  • the same parts of the converter shown in FIG. 4 in comparison to the converter shown in FIG. 1 are given the same reference numerals.
  • the structural differences between the known converter according to FIG. 4 and the converter according to FIG. 1 are obvious to the person skilled in the art.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
EP96104591A 1995-07-19 1996-03-22 Dispositif avec compensation active du bruit Expired - Lifetime EP0755166B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19526124 1995-07-19
DE19526124A DE19526124C2 (de) 1995-07-19 1995-07-19 Einrichtung mit aktiver Lärmkompensation

Publications (3)

Publication Number Publication Date
EP0755166A2 true EP0755166A2 (fr) 1997-01-22
EP0755166A3 EP0755166A3 (fr) 1998-09-09
EP0755166B1 EP0755166B1 (fr) 2001-11-07

Family

ID=7767108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96104591A Expired - Lifetime EP0755166B1 (fr) 1995-07-19 1996-03-22 Dispositif avec compensation active du bruit

Country Status (3)

Country Link
US (2) US5809156A (fr)
EP (1) EP0755166B1 (fr)
DE (2) DE19526124C2 (fr)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6134336A (en) * 1998-05-14 2000-10-17 Motorola, Inc. Integrated speaker assembly of a portable electronic device
US20010046304A1 (en) * 2000-04-24 2001-11-29 Rast Rodger H. System and method for selective control of acoustic isolation in headsets
GB2393352A (en) * 2002-09-23 2004-03-24 Mitel Knowledge Corp Speaker system with two enclosures having complementary frequency responses
US7499555B1 (en) * 2002-12-02 2009-03-03 Plantronics, Inc. Personal communication method and apparatus with acoustic stray field cancellation
GB2401278B (en) * 2003-04-30 2007-06-06 Sennheiser Electronic A device for picking up/reproducing audio signals
US6785395B1 (en) 2003-06-02 2004-08-31 Motorola, Inc. Speaker configuration for a portable electronic device
US20050079832A1 (en) * 2003-10-09 2005-04-14 Shlomo Gelbart Transducer design for rugged portable communications products
DE102005016204A1 (de) * 2005-04-07 2006-10-12 Sennheiser Electronic Gmbh & Co. Kg Kopfhörer zum Anschluss an eine externe aktive Lärmkompensationsvorrichtung
JP2009513051A (ja) * 2005-10-21 2009-03-26 エスエフエックス テクノロジーズ リミテッド オーディオデバイスの改良
DE102005052548A1 (de) * 2005-11-02 2007-05-03 Sennheiser Electronic Gmbh & Co. Kg Wandlersystem für eine aktive Lärmkompensationsvorrichtung
US8054992B2 (en) * 2006-04-24 2011-11-08 Bose Corporation High frequency compensating
US8077874B2 (en) * 2006-04-24 2011-12-13 Bose Corporation Active noise reduction microphone placing
TW200813978A (en) * 2006-09-08 2008-03-16 Junichi Kakumoto Audio player with decreasing environmental noise function
US9558732B2 (en) * 2007-08-15 2017-01-31 Iowa State University Research Foundation, Inc. Active noise control system
US20090136052A1 (en) * 2007-11-27 2009-05-28 David Clark Company Incorporated Active Noise Cancellation Using a Predictive Approach
US9020158B2 (en) 2008-11-20 2015-04-28 Harman International Industries, Incorporated Quiet zone control system
US8135140B2 (en) * 2008-11-20 2012-03-13 Harman International Industries, Incorporated System for active noise control with audio signal compensation
US8718289B2 (en) * 2009-01-12 2014-05-06 Harman International Industries, Incorporated System for active noise control with parallel adaptive filter configuration
DE102009005302B4 (de) 2009-01-16 2022-01-05 Sennheiser Electronic Gmbh & Co. Kg Schutzhelm und Vorrichtung zur aktiven Störschallunterdrückung
US8189799B2 (en) * 2009-04-09 2012-05-29 Harman International Industries, Incorporated System for active noise control based on audio system output
US8199924B2 (en) 2009-04-17 2012-06-12 Harman International Industries, Incorporated System for active noise control with an infinite impulse response filter
US8077873B2 (en) 2009-05-14 2011-12-13 Harman International Industries, Incorporated System for active noise control with adaptive speaker selection
DE102010004667B4 (de) * 2010-01-14 2016-08-11 Austriamicrosystems Ag Gehäuse und Lautsprechermodul
DE102011086646B4 (de) 2011-11-18 2013-06-27 Siemens Aktiengesellschaft Bildschirm und Verfahren zur Ansteuerung eines Bildschirms
US10623847B2 (en) * 2018-08-02 2020-04-14 EVA Automation, Inc. Headphone with multiple acoustic paths

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DE2500397A1 (de) * 1975-01-07 1976-07-08 Manger J W Membran fuer elektroakustische wandlersysteme
DE3706481A1 (de) * 1986-02-28 1987-09-03 Sony Corp Ohrhoerer
EP0425129A2 (fr) * 1989-10-27 1991-05-02 Bose Corporation Ecouteur
US5181252A (en) * 1987-12-28 1993-01-19 Bose Corporation High compliance headphone driving

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JPS5388718A (en) * 1976-12-15 1978-08-04 Matsushita Electric Ind Co Ltd Sealed head phone
JPS5526730A (en) * 1978-08-15 1980-02-26 Sony Corp Electroacoustic converter
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DE3722832A1 (de) * 1987-07-03 1989-01-12 Electronic Werke Deutschland Membran fuer einen lautsprecher
EP0366693A1 (fr) * 1987-07-03 1990-05-09 EWD Electronic-Werke Deutschland GmbH Membrane pour haut-parleurs
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US5208868A (en) * 1991-03-06 1993-05-04 Bose Corporation Headphone overpressure and click reducing
US5148887A (en) * 1991-04-01 1992-09-22 Gentex Corporation Earcup assembly incorporating mechanical active noise reduction
US5185807A (en) * 1991-05-08 1993-02-09 David Clark Company Incorporated Headset with multi-position stirrup assemblies
US5343523A (en) * 1992-08-03 1994-08-30 At&T Bell Laboratories Telephone headset structure for reducing ambient noise
US5492129A (en) * 1993-12-03 1996-02-20 Greenberger; Hal Noise-reducing stethoscope
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Publication number Priority date Publication date Assignee Title
DE2500397A1 (de) * 1975-01-07 1976-07-08 Manger J W Membran fuer elektroakustische wandlersysteme
DE3706481A1 (de) * 1986-02-28 1987-09-03 Sony Corp Ohrhoerer
US5181252A (en) * 1987-12-28 1993-01-19 Bose Corporation High compliance headphone driving
EP0425129A2 (fr) * 1989-10-27 1991-05-02 Bose Corporation Ecouteur

Also Published As

Publication number Publication date
DE59608113D1 (de) 2001-12-13
US5949897A (en) 1999-09-07
EP0755166B1 (fr) 2001-11-07
EP0755166A3 (fr) 1998-09-09
DE19526124C2 (de) 1997-06-26
DE19526124A1 (de) 1997-01-30
US5809156A (en) 1998-09-15

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