DE102014016397A1 - Sleep hood: Device for reducing or eliminating snoring and sleeping sounds - Google Patents

Sleep hood: Device for reducing or eliminating snoring and sleeping sounds Download PDF

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DE102014016397A1
DE102014016397A1 DE102014016397.0A DE102014016397A DE102014016397A1 DE 102014016397 A1 DE102014016397 A1 DE 102014016397A1 DE 102014016397 A DE102014016397 A DE 102014016397A DE 102014016397 A1 DE102014016397 A1 DE 102014016397A1
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sleep
snoring
noise
sounds
breathing
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wird später genannt werden Erfinder
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C21/00—Attachments for beds, e.g. sheet holders, bed-cover holders; Ventilating, cooling or heating means in connection with bedsteads or mattresses
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C29/00—Nets for protection against insects in connection with chairs or beds; Bed canopies
    • A47C29/003—Bed canopies
    • 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
    • G10K11/17857—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
    • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
    • 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
    • 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
    • A61M2021/0044—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 sight sense
    • 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
    • A61M2021/0044—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 sight sense
    • A61M2021/005—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 sight sense images, e.g. video
    • 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
    • A61M2021/0083—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 especially for waking up
    • 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
    • A61M21/02—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 for inducing sleep or relaxation, e.g. by direct nerve stimulation, hypnosis, analgesia
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3375—Acoustical, e.g. ultrasonic, measuring 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
    • G10K2210/116—Medical; Dental

Abstract

Mit zunehmendem Alter schnarchen beim Schlafen ca. 60% der Männer und ca. 40% der Frauen. Selbst Kinder können schnarchen. Zudem können beim Schlafen hörbare Atemgeräusche auftreten. Diese Schnarch- oder Atemgeräusche werden im und für den Schlaf oft für sich selbst oder andere Menschen oft als störend empfunden und können einen ruhigen Schlaf behindern. Diverse Atemgeräte, Mundspangen, Nasenöffner etc. beseitigen diese Geräusche meist nicht oder nur unzureichend. Die Erfindung beseitigt nicht die Ursachen der Schnarch- oder Atemgeräusche, sondern dämpft bzw. eliminiert diese Geräusche, so dass ein besserer, gesunder und ruhiger Schlaf für den Geräuschverursacher sowie andere Menschen ermöglicht wird. Die Dämpfung oder Eliminierung der Schnarch- oder Atemgeräusche gelingt physikalisch optimal unter Nutzung des Noice-Canceling/Antischalltechnik in einem grob abgegrenzten und definierten Raum oder Volumen. Diese Voraussetzungen zur Dämpfung bzw. Eliminierung der Schnarch- und Schlafgeräusche sind erreichbar, indem am bzw. um das Bett im Bereich der Geräuschentstehung und Geräuschaufnahme ein Raum geschaffen wird, welcher eine Dämpfung der Geräusche ergeben kann, die Geräuschausbreitung begrenzt, die Schnarch- und Atemgeräusche definiert mittels der bekannten Noice Canceling/Antischalltechnik und eines Schallwandlers bzw. Empfängers (z. B. Mikrofon) in elektrische Signale umwandelt und diese dann mittels eines anderen Schallwandlers (z. B. Lausprecher) phasenversetzt und tonauslöschend oder tondämpfend zurück strahlt. Zusätzlich kann die benannten Vorrichtung mit weiteren technischen Erweiterungen ergänzt werden, so dass neben der Funktion der Geräuschminderung/-unterdrückung auch bekannte und künftige Funktionen wie Wecker, Audio- und Video, Zeitansage und Zeitanzeige sowie Licht/Ambiente-Licht sowie Schlaf- und Gesundheitsüberwachungssysteme verfügbar sind.As you grow older, about 60% of men and about 40% of women snore when they sleep. Even children can snore. In addition, audible breath sounds can occur during sleep. These snoring or breathing sounds are often distressing to themselves or other people in and for sleep, and may hinder peaceful sleep. Various respirators, mouthpieces, nose openers, etc. eliminate these noises usually not or only inadequately. The invention does not eliminate the causes of snoring or breathing sounds, but dampens or eliminates these noises, allowing for a better, healthy and quiet sleep for the noise maker as well as other people. The attenuation or elimination of snoring or breathing sounds succeeds physically optimally using the noice-canceling / anti-sounding technique in a roughly defined and defined space or volume. These conditions for damping or eliminating the snoring and sleep sounds are achievable by creating a space on or around the bed in the area of noise generation and noise absorption, which can result in a damping of noise, limits noise propagation, snoring and breathing sounds defined by means of the known noice canceling / anti-sounding technique and a transducer or receiver (eg microphone) converted into electrical signals and then by means of another transducer (eg, speakers) out of phase and radiated sound-canceling or sound-absorbing back. In addition, the named device can be supplemented with further technical extensions, so that in addition to the function of noise reduction / suppression also known and future functions such as alarm clock, audio and video, time announcement and time display and light / ambient light and sleep and health monitoring systems available are.

Description

Mit zunehmendem Alter schnarchen beim Schlafen ca. 60% der Männer und ca. 40% der Frauen. Selbst Kinder können schnarchen. Zudem können beim Schlafen hörbare Atemgeräusche auftreten. Diese Schnarch- oder Atemgeräusche werden im und für den Schlaf oft für sich selbst oder andere Menschen oft als störend empfunden und können einen ruhigen Schlaf behindern. Diverse Atemgeräte, Mundspangen, Nasenöffner etc. beseitigen diese Geräusche meist nicht oder nur unzureichend.As you grow older, about 60% of men and about 40% of women snore when they sleep. Even children can snore. In addition, audible breath sounds can occur during sleep. These snoring or breathing sounds are often distressing to themselves or other people in and for sleep, and may hinder peaceful sleep. Various respirators, mouthpieces, nose openers, etc. eliminate these noises usually not or only inadequately.

Die Erfindung beseitigt nicht die Ursachen der Schnarch- oder Atemgeräusche, sondern dämpft bzw. eliminiert die Geräusche, so dass ein besserer, gesunder und ruhiger Schlaf für den Geräuschverursacher sowie andere Menschen ermöglicht wird.The invention does not eliminate the causes of snoring or breathing sounds, but dampens or eliminates the noise, allowing a better, healthy and quiet sleep for the noise maker and other people.

Die Dämpfung oder Eliminierung der Schnarch- oder Atemgeräusche gelingt physikalisch optimal unter Nutzung des Noice-Canceling/Antischalltechnik in einem grob abgegrenzten und definierten Raum oder Volumen. Da die meisten Schnarch- und Atemgeräusche im niederfrequenten Bereich bis ca. 1.000 kHz nachgewiesen sind, ist mittels Noice-Cancelling/Antischall eine gute bis komplette Lautstärkereduktion dieser störenden Geräusche möglich.The attenuation or elimination of snoring or breathing sounds succeeds physically optimally using the noice-canceling / anti-sounding technique in a roughly defined and defined space or volume. Since most snoring and breathing sounds are detected in the low-frequency range up to approx. 1,000 kHz, noice-canceling / anti-noise enables a good to complete volume reduction of these disturbing noises.

Die Möglichkeiten, welche die Noice-Cancelling/Antischalltechnik bieten, sind prinzipiell bekannt. Für spezifische Aufgabenstellungen sind jedoch spezifische Problemlösungen notwendig, wie zum Beispiel aus den folgenden Patenten und Offenlegungsschriften zu ersehen ist:

  • 1. Offenlegungsschrift DE 197 06 645 A1
  • 2. Offenlegungsschrift DE 41 27 473 A1
  • 3. Patentschrift DE 40 05 846 C2
  • 4. Patentschrift DE 39 22 139 C2
  • 5. Patentschrift DE 40 11 658 C2
  • 6. Offenlegungsschrift DE 43 42 133 A1
  • 7. Offenlegungsschrift DE 43 41 951 A1
  • 8. Offenlegungsschrift DE 44 21 803 A1
  • 9. Patentschrift DE 39 21 307 C2
  • 10. Patentschrift DE 25 31 865 C3
  • 11. Patentschrift DE 28 14 093 C2
The possibilities offered by noise-canceling / anti-sounding technology are known in principle. For specific tasks, however, specific problem solutions are necessary, as can be seen, for example, from the following patents and publications:
  • 1. Disclosure DE 197 06 645 A1
  • 2. Disclosure DE 41 27 473 A1
  • 3rd patent DE 40 05 846 C2
  • 4. Patent Specification DE 39 22 139 C2
  • 5. Patent Specification DE 40 11 658 C2
  • 6. Disclosure DE 43 42 133 A1
  • 7. Disclosure DE 43 41 951 A1
  • 8. Disclosure DE 44 21 803 A1
  • 9. Patent Specification DE 39 21 307 C2
  • 10th patent DE 25 31 865 C3
  • 11th patent DE 28 14 093 C2

Diese Voraussetzungen zur Dämpfung bzw. Eliminierung der Schnarch- und Schlafgeräusche sind erreichbar, indem am bzw. um das Bett im Bereich der Geräuschentstehung und Geräuschaufnahme ein Raum geschaffen wird, welcher eine Dämpfung der Geräusche ergeben kann, die Geräuschausbreitung begrenzt, die Schnarch- und Atemgeräusche definiert mittels der bekannten Noice Canceling/Antischalltechnik und eines Schallwandlers bzw. Empfängers (z. B. Mikrofon) in elektrische Signale umwandelt und diese dann mittels eines anderen Schallwandlers (z. B. Lausprecher) phasenversetzt und tonauslöschend oder tondämpfend zurück strahlt.These conditions for damping or eliminating the snoring and sleep sounds are achievable by creating a space on or around the bed in the area of noise generation and noise absorption, which can result in a damping of noise, limits noise propagation, snoring and breathing sounds defined by means of the known noice canceling / anti-sounding technique and a transducer or receiver (eg microphone) converted into electrical signals and then by means of another transducer (eg, speakers) out of phase and radiated sound-canceling or sound-absorbing back.

Die Schaffung des Raumes ist mit einer festen oder flexiblen akustischen „Haube” möglich, wobei diese ungedämmt, schallgedämmt und fest installiert, mobil, klappbar, schwenkbar installiert werden kann.The creation of the room is possible with a fixed or flexible acoustic "hood", which can be installed uninsulated, soundproofed and permanently installed, mobile, hinged, swiveling.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 19706645 A1 [0004] DE 19706645 A1 [0004]
  • DE 4127473 A1 [0004] DE 4127473 A1 [0004]
  • DE 4005846 C2 [0004] DE 4005846 C2 [0004]
  • DE 3922139 C2 [0004] DE 3922139 C2 [0004]
  • DE 4011658 C2 [0004] DE 4011658 C2 [0004]
  • DE 4342133 A1 [0004] DE 4342133 A1 [0004]
  • DE 4341951 A1 [0004] DE 4341951 A1 [0004]
  • DE 4421803 A1 [0004] DE 4421803 A1 [0004]
  • DE 3921307 C2 [0004] DE 3921307 C2 [0004]
  • DE 2531865 C3 [0004] DE 2531865 C3 [0004]
  • DE 2814093 C2 [0004] DE 2814093 C2 [0004]

Claims (4)

Die Vorrichtung zur Schnarch- und Atemgeräuschreduktion bzw. -eliminierung ist gekennzeichnet dadurch, dass ein definierter Raum in unterschiedlicher konstruktiver und optischer Ausprägung und Form (Fig. 1) am und um das Bett geschaffen wird, welcher gedämmt oder nicht gedämmt ist und in einer Kombination gleichzeitig die Geräuschquelle des Schnarchenden und Atmenden bzw. das neben ihm Schlafenden fest und/oder beweglich akustisch umgibt, die Schnarch-, Atem- oder andere Geräusche im bekannten Noice-Cancelling/Antischall Verfahren akustisch mittels Schallwandlern (Fig. 2) z. B. Mikrofone erfasst, diese Geräusche verarbeitet und phasenverschoben mittels weiteren Schallwandlern (Fig. 3) z. B. Lausprecher in den Raum der Verursacher und Empfänger zurück gibt, so dass sich die Töne gegenseitig auslöschen und damit eine Geräuschdämpfung bzw. Geräuscheliminierung für die Schlafenden ergibt.The device for snoring and breathing noise reduction or elimination is characterized in that a defined space in different constructive and optical expression and shape (Fig. 1 ) is provided on and around the bed, which is insulated or not insulated and in a combination at the same time acoustically surrounds the sound source of the snoring and breathing or sleeping next to him sound and / or mobile, the snoring, breathing or other sounds in the known noice-canceling / anti-sound method acoustically by means of sound transducers (Fig. 2 ) z. As microphones detected, these noises processed and phase-shifted by means of other transducers (Fig. 3 ) z. B. speakers in the space of causer and receiver returns, so that the tones cancel each other out and thus results in a noise attenuation or noise removal for the sleeping. Die Vorrichtung kann konstruktiv geschlossen, teilgeschlossen oder offen oder als Wand (für einen einen virtuellen Raum) ausgeprägt seinThe device can be structurally closed, partially closed or open or as a wall (for a virtual space) Die Vorrichtung ist am Bett entweder starr oder flexibel befestigt oder klappbar oder drehbar oder mobil bzw. kann ebenso faltbar seinThe device is fixed to the bed either rigidly or flexibly or hinged or rotatable or mobile or may also be foldable Die Vorrichtung ist ergänzbar durch eingebautes Audio- und Videosysteme, Wecker, Beleuchtung, Ambientebeleuchtung z. B. zum Wecken, Belüftungs- und Klimatisierungssysteme, Schlaf- bzw. Gesundheitsüberwachungssysteme (Fig. 4)The device can be supplemented by built-in audio and video systems, alarm, lighting, ambient lighting z. B. for awakening, ventilation and air conditioning systems, sleep or health monitoring systems (Fig. 4 )
DE102014016397.0A 2014-11-05 2014-11-05 Sleep hood: Device for reducing or eliminating snoring and sleeping sounds Withdrawn DE102014016397A1 (en)

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Cited By (1)

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US20220031998A1 (en) * 2018-07-24 2022-02-03 Bonnie S Schnitta Sound Disturbance Inhibition System

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DE4341951A1 (en) 1992-12-17 1994-06-23 Volkswagen Ag Interference noise damper for exhaust gas system
DE4342133A1 (en) 1993-12-10 1995-06-14 Nokia Deutschland Gmbh Arrangement for active noise reduction
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DE2531865C3 (en) 1975-07-17 1980-10-23 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Passive anti-noise source (capsule)
DE2814093C2 (en) 1978-04-01 1980-05-14 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Anti-noise generator
DE3922139C2 (en) 1988-07-06 1991-06-13 Bridgestone Corp., Tokio/Tokyo, Jp
DE4005846C2 (en) 1989-02-27 1992-07-23 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa, Jp
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