WO2002100287A2 - Suppression du bruit associe a un traitement dentaire - Google Patents

Suppression du bruit associe a un traitement dentaire Download PDF

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Publication number
WO2002100287A2
WO2002100287A2 PCT/IL2002/000446 IL0200446W WO02100287A2 WO 2002100287 A2 WO2002100287 A2 WO 2002100287A2 IL 0200446 W IL0200446 W IL 0200446W WO 02100287 A2 WO02100287 A2 WO 02100287A2
Authority
WO
WIPO (PCT)
Prior art keywords
microphone
sound
patient
input
ear
Prior art date
Application number
PCT/IL2002/000446
Other languages
English (en)
Other versions
WO2002100287A3 (fr
Inventor
Uri Zilberman
Nissim Saban
Original Assignee
Uri Zilberman
Nissim Saban
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 Uri Zilberman, Nissim Saban filed Critical Uri Zilberman
Priority to AU2002302962A priority Critical patent/AU2002302962A1/en
Publication of WO2002100287A2 publication Critical patent/WO2002100287A2/fr
Publication of WO2002100287A3 publication Critical patent/WO2002100287A3/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M21/00—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis
    • 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
    • G10K11/17813—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17815—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the reference signals and the error signals, i.e. primary path
    • 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
    • G10K11/17837—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 by retaining part of the ambient acoustic environment, e.g. speech or alarm signals that the user needs to hear
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—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
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C2203/00—Means for making patients feel at ease during dental treatment, e.g. dental instruments in the form of toys
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M21/00—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis
    • A61M2021/0005—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis by the use of a particular sense, or stimulus
    • A61M2021/0027—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis by the use of a particular sense, or stimulus by the hearing sense

Definitions

  • the present invention relates to dentistry generally and more particularly to noise reduction during dental treatment.
  • Japanese Kokai No. 4-242638 describes a noise reduction device for dental cutters which senses dental treatment noise at a location near a patient, determines the amplitude and phase characteristics thereof and produces an interference sound having the same amplitude and phase characteristics as the sensed dental treatment noise.
  • the device described in Japanese Kokai No. 4-242638 employs a digital filter whose amplitude and phase characteristics can be set.
  • U.S. Patent 5,692,056 describes a method and apparatus for intracranial noise suppression, which produces active cancellation of vibrational noise produced as by a dental drill.
  • U.S. Patents 5,305,387, 4,977,600, 4,644,581 and 4,455,675 relate to other types of active noise cancellation systems.
  • a system for dental treatment noise suppression including a first microphone and a first speaker arranged to be located adjacent a first ear of a patient, a second microphone and a second speaker arranged to be located adjacent a second ear of a patient, a first quiet zone generator operative to receive an input from the first microphone and to provide canceling noise at the first speaker, thereby creating a quite zone adjacent the first ear of the patient and a second quiet zone generator operative to receive an input from the second microphone and to provide canceling noise at the second speaker thereby creating a quite zone adjacent the second ear of the patient
  • both the first and the second quiet zone generators include adaptive digital sound processors
  • the first and second microphones and the first and second speakers are located in a patient headrest forming part of or attached to a dental treatment chair
  • a method for suppressing dental treatment noise including placing a first microphone and a first speaker adjacent a first ear of a patent, placing a second microphone and a second speaker adjacent a second ear of a patient. receiving an input from the first microphone and providing canceling noise at (he first speaker, thereby creating a quite zone adjacent the first ear of the patient, and receiving an input from the second microphone and providing canceling noise at the second speaker, thereby creating a quite zone adjacent the second ear of the patient
  • the canceling noise is provided by employing an adaptive digital speech processing algorithm
  • FIG. 1 is a simplified pictorial illustration of a dental treatment noise suppression system and functionality constructed and operative in accordance with a preferred embodiment of the present invention
  • Fig. 2 is a simplified functional block diagram of circuitry employed in one channel of the system and functionality shown in Fig. 1;
  • Fig. 3 is an electrical schematic of a preferred embodiment of one channel of the system of Fig. 2;
  • Fig. 4 is a flow chart illustrating operation of the circuitry of Fig. 3.
  • Fig. 1 is a simplified pictorial illustration of a dental treatment noise suppression system and functionality constructed and operative in accordance with a preferred embodiment of the present invention and to Fig. 2. which is a simplified functional block diagram of circuitry employed in one channel of the system and functionality shown in Fig. 1.
  • a dental treatment noise suppression system and functionality which may be integrally formed with a conventional dental chair 10, as illustrated in Fig. 1, or alternatively retrofitted thereto.
  • a headrest 12 of the dental chair is equipped with a pair of individual ear noise suppression assemblies 14. It is a particular feature of the present invention that the individual ear noise suppression assemblies 14, although located in the close vicinity of each ear of a patient, do not block sound from reaching the patient.
  • a dental practitioner is supplied with a microphone 16, preferably associated with a wireless transmitter 18 for enabling instructions or other verbal communications from the dental practitioner to reach the patient without substantial suppression or distortion thereof.
  • the microphone 16 is a throat microphone, such as that commercially available from Earmark, Inc. of Hamden, Connecticut, U.S.A.
  • each individual ear noise suppression assembly 14 preferably comprises a microphone 20, located in the vicinity of the patients, ear..which.
  • Circuitry 22 is preferably located in the same general location as microphone 20 but alternatively may be remote therefrom and communicate with microphone 20 in a wireless manner
  • Circuitry 22 provides a noise canceling speaker driving output to a speaker 24 which is preferably located in the same general location as microphone 20 Alternatively speaker 24 may be located elsewhere As a further alternative, speaker 24 may comprise a plurality of mutually spatially distributed speakers
  • the outputs of microphones 16 and 20 are each preferably supplied to a low pass filter, respectively designated by reference numerals 26 and 28
  • the outputs of low pass filters 26 and 28 are converted to digital form in an A/D-D/A converter 30, preferably embodied in a TLV320AIC27 chip, commercially available from Texas Instruments
  • the bandwidth threshold of low pass filter 26 is 4 KHz
  • that of low pass filter 28 is 7KHz
  • the A/D-D/A converter 30 preferably provides a serial output to a digital signal processor 32, typically embodied in a chip belonging to the TMS320C5000 family of DSPs commercially available from Texas Instruments
  • Digital signal processor 32 is operative to provide a digital noise cancellation signal which causes the sound sensed by microphone 20, adjacent each ear of the patient, to be identical to that sensed by microphone 16, which is preferably only the voice of the dental practitioner
  • microphone 16 may be eliminated
  • digital signal processor 32 is operative to provide a digital noise cancellation signal which causes the sound sensed by microphone 20 to be zero, insofar as possible
  • suitable conventional power and memory circuitry 34 there is associated with digital signal processor 32, suitable conventional power and memory circuitry 34
  • the digital noise cancellation signal output of digital signal processor 32 is supplied to speaker 24 via an analog output of A/D-D/A converter 30 which here functions as a D/A converter
  • the sound processing circuitry 22 also typically comp ⁇ ses DC voltage blocking devices such as capacitors Cl, C2 and C3 It is further noted that one or both individual ear noise suppression assemblies 14 (Fig 1) may simultaneously be embodied in the circuitry shown m Fig 3
  • the individual ear noise suppression assembly 14 in general, and the digital signal processor 32 in particular provide an adaptive filtering functionality, thus providing highly effective noise cancellation
  • This functionality is provided typically by means of suitable software resident in digital signal processor 32, which expresses an algorithm, which is now described in detail with reference to the flow chart of Fig 4
  • phase shift ensures that the speech of the dental practitioner is not cancelled by the system
  • An estimation of the sound transfer function operative in the environment of the system is then made, preferably by emitting white noise at speaker 24 and employing a least mean square algorithm
  • the estimation function may be expressed as
  • H( ⁇ ) represents the sound transfer function
  • a difference function is now calculated, using the current sample which represents the difference between the real signal and the calculated signal.
  • the difference function preferably is expressed as follows Thereafter the coefficients of the transfer function are updated in accordance -with the following:
  • Hn * i (/) k * Diff * + H tripod(z) where k is a constant that determines the speed of convergence. 5 This process is preferably carried out at least 100 times in order to obtain acceptable convergence.
  • N is the magnitude of the vector H(i). 25 H(i) represents the sound transfer function.
  • the system output as heard by the patient is then estimated as follows:
  • the current element of the D vector is calculated as sst forth hereinbelow This vector includes the difference between the inputs of the microphones 16 and 20 and the predicted system output: where X is an input from the digital sample of the sound picked up by microphones 16 and 20 as shown hereinbelow.
  • the vector D(l) is shifted so the new difference becomes the first element of the vector D(l) and the last difference is discarded .
  • the process described above is carried out at a sampling rate which preferably exceeds 14 KHz.
  • the input X which is fed to the system algorithm is preferably calculated in the following manner:
  • X X ⁇ (n) - X ⁇ (n - d) * r
  • X2 is the input from microphone 16
  • d is a delay factor
  • r is a volume adjustment factor
  • Coefficients d and r are preferably set so the input of microphone 16 is not be cancelled by the system and will reach the patient's ear.

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

Abstract

L'invention concerne un système et un procédé permettant de supprimer le bruit associé à un traitement dentaire, comprenant un premier microphone et un premier haut-parleur disposés de façon à être adjacents à une première oreille du patient, un second microphone et un second haut-parleur étant disposés de façon à être adjacents à la seconde oreille du patient. Un premier générateur de zone silencieuse est destiné à recevoir une entrée du premier microphone et à générer un bruit d'annulation au niveau du premier haut-parleur, créant ainsi une zone silencieuse adjacente à la première oreille du patient, et un second générateur de zone silencieuse est destiné à recevoir une entrée d'un second microphone et à générer un bruit d'annulation au niveau du second haut-parleur, créant ainsi une zone silencieuse adjacente à la seconde oreille du patient.
PCT/IL2002/000446 2001-06-10 2002-06-09 Suppression du bruit associe a un traitement dentaire WO2002100287A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002302962A AU2002302962A1 (en) 2001-06-10 2002-06-09 Dental treatment noise suppression

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL14366401A IL143664A0 (en) 2001-06-10 2001-06-10 Dental treatment noise suppession
IL143664 2001-06-10

Publications (2)

Publication Number Publication Date
WO2002100287A2 true WO2002100287A2 (fr) 2002-12-19
WO2002100287A3 WO2002100287A3 (fr) 2004-03-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2002/000446 WO2002100287A2 (fr) 2001-06-10 2002-06-09 Suppression du bruit associe a un traitement dentaire

Country Status (3)

Country Link
AU (1) AU2002302962A1 (fr)
IL (1) IL143664A0 (fr)
WO (1) WO2002100287A2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2388998A (en) * 2002-05-23 2003-11-26 David Charles Moss Actively reducing noise produced by dental equipment
WO2006117718A1 (fr) * 2005-05-03 2006-11-09 Koninklijke Philips Electronics N.V. Dispositif et procede de detection de sons
EP1743594A1 (fr) * 2005-07-14 2007-01-17 Yechiel Cohen Système dentaire commandé par ordinateur et procédé
DE102007054051A1 (de) 2007-11-13 2009-05-20 Genima Innovations Marketing Gmbh System und Verfahren zur Verringerung von Angst und Belastungen des Patienten bei der Zahnbehandlung
WO2010026687A1 (fr) * 2008-09-03 2010-03-11 Yamada Tomomi Repose-tête pour fauteuil de traitement dentaire et fauteuil de traitement dentaire
DE102013227158A1 (de) 2013-11-20 2015-05-21 Christian Nitzschke Geräuschreduktion für Dentalinstrumente
US9609423B2 (en) 2013-09-27 2017-03-28 Volt Analytics, Llc Noise abatement system for dental procedures

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4977600A (en) * 1988-06-07 1990-12-11 Noise Cancellation Technologies, Inc. Sound attenuation system for personal seat
US5133017A (en) * 1990-04-09 1992-07-21 Active Noise And Vibration Technologies, Inc. Noise suppression system
US5774565A (en) * 1992-11-02 1998-06-30 Lucent Technologies Inc. Electronic cancellation of ambient noise in telephone headset
US6396930B1 (en) * 1998-02-20 2002-05-28 Michael Allen Vaudrey Active noise reduction for audiometry
US6463411B1 (en) * 1998-11-09 2002-10-08 Xinde Li System and method for processing low signal-to-noise ratio signals
US6466673B1 (en) * 1998-05-11 2002-10-15 Mci Communications Corporation Intracranial noise suppression apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4977600A (en) * 1988-06-07 1990-12-11 Noise Cancellation Technologies, Inc. Sound attenuation system for personal seat
US5133017A (en) * 1990-04-09 1992-07-21 Active Noise And Vibration Technologies, Inc. Noise suppression system
US5774565A (en) * 1992-11-02 1998-06-30 Lucent Technologies Inc. Electronic cancellation of ambient noise in telephone headset
US6396930B1 (en) * 1998-02-20 2002-05-28 Michael Allen Vaudrey Active noise reduction for audiometry
US6466673B1 (en) * 1998-05-11 2002-10-15 Mci Communications Corporation Intracranial noise suppression apparatus
US6463411B1 (en) * 1998-11-09 2002-10-08 Xinde Li System and method for processing low signal-to-noise ratio signals

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2388998A (en) * 2002-05-23 2003-11-26 David Charles Moss Actively reducing noise produced by dental equipment
WO2006117718A1 (fr) * 2005-05-03 2006-11-09 Koninklijke Philips Electronics N.V. Dispositif et procede de detection de sons
EP1743594A1 (fr) * 2005-07-14 2007-01-17 Yechiel Cohen Système dentaire commandé par ordinateur et procédé
DE102007054051A1 (de) 2007-11-13 2009-05-20 Genima Innovations Marketing Gmbh System und Verfahren zur Verringerung von Angst und Belastungen des Patienten bei der Zahnbehandlung
WO2010026687A1 (fr) * 2008-09-03 2010-03-11 Yamada Tomomi Repose-tête pour fauteuil de traitement dentaire et fauteuil de traitement dentaire
JP4718648B2 (ja) * 2008-09-03 2011-07-06 朋美 山田 歯科治療椅子用ヘッドレスト及び歯科治療椅子
US8480176B2 (en) 2008-09-03 2013-07-09 Tomomi Yamada Headrest for dental treatment chair and dental treatment chair
US9609423B2 (en) 2013-09-27 2017-03-28 Volt Analytics, Llc Noise abatement system for dental procedures
DE102013227158A1 (de) 2013-11-20 2015-05-21 Christian Nitzschke Geräuschreduktion für Dentalinstrumente
WO2015075075A1 (fr) 2013-11-20 2015-05-28 Nitzschke Christian Réduction de bruit pour instrument dentaire

Also Published As

Publication number Publication date
IL143664A0 (en) 2002-04-21
WO2002100287A3 (fr) 2004-03-04
AU2002302962A1 (en) 2002-12-23

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