Noise reduction system
An active noise reduction system for an earphone 1 or ear defender, the system comprising a noise reduction sound generator 14, a microphone 5 acoustically coupled to said generator, a feedback loop connected between the microphone and generator, and including loop stabilisation means 6, 7 for filte...
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| creator | ANTHONY JOHN SALLOWAY |
| description | An active noise reduction system for an earphone 1 or ear defender, the system comprising a noise reduction sound generator 14, a microphone 5 acoustically coupled to said generator, a feedback loop connected between the microphone and generator, and including loop stabilisation means 6, 7 for filtering and inverting the phase of a microphone signal and means 12 for amplifying the signal, the sound generator 14 being mounted within an earphone or oar defender on a partition wall 16 between a rear cavity which is closed and a front cavity which is closed only when the structure is supported against a user's ear, in which the partition wall 16 is provided with an air vent hole 9 effective to equalise air pressure across the wall such that the effect of a large acoustic pressure pulse in the front cavity will be reduced in amplitude and thereby prevented from causing significant displacement of a diaphragm of sound generator 14, the diaphragm thus being able to be driven solely by the applied electrical signals. This restrains the effects of large external pressure pulses or buffets from causing damage to the diaphragm. |
| format | Patent |
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This restrains the effects of large external pressure pulses or buffets from causing damage to the diaphragm.</description><language>eng</language><subject>ACOUSTICS ; ACOUSTICS NOT OTHERWISE PROVIDED FOR ; BANDAGES, DRESSINGS OR ABSORBENT PADS ; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS ; FILTERS IMPLANTABLE INTO BLOOD VESSELS ; FIRST-AID KITS ; FOMENTATION ; HUMAN NECESSITIES ; HYGIENE ; MEDICAL OR VETERINARY SCIENCE ; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL ; MUSICAL INSTRUMENTS ; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES ; PHYSICS ; PROSTHESES ; SOUND-PRODUCING DEVICES ; TREATMENT OR PROTECTION OF EYES OR EARS</subject><creationdate>1991</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19910213&DB=EPODOC&CC=GB&NR=2234882A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19910213&DB=EPODOC&CC=GB&NR=2234882A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>ANTHONY JOHN SALLOWAY</creatorcontrib><title>Noise reduction system</title><description>An active noise reduction system for an earphone 1 or ear defender, the system comprising a noise reduction sound generator 14, a microphone 5 acoustically coupled to said generator, a feedback loop connected between the microphone and generator, and including loop stabilisation means 6, 7 for filtering and inverting the phase of a microphone signal and means 12 for amplifying the signal, the sound generator 14 being mounted within an earphone or oar defender on a partition wall 16 between a rear cavity which is closed and a front cavity which is closed only when the structure is supported against a user's ear, in which the partition wall 16 is provided with an air vent hole 9 effective to equalise air pressure across the wall such that the effect of a large acoustic pressure pulse in the front cavity will be reduced in amplitude and thereby prevented from causing significant displacement of a diaphragm of sound generator 14, the diaphragm thus being able to be driven solely by the applied electrical signals. This restrains the effects of large external pressure pulses or buffets from causing damage to the diaphragm.</description><subject>ACOUSTICS</subject><subject>ACOUSTICS NOT OTHERWISE PROVIDED FOR</subject><subject>BANDAGES, DRESSINGS OR ABSORBENT PADS</subject><subject>DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS</subject><subject>FILTERS IMPLANTABLE INTO BLOOD VESSELS</subject><subject>FIRST-AID KITS</subject><subject>FOMENTATION</subject><subject>HUMAN NECESSITIES</subject><subject>HYGIENE</subject><subject>MEDICAL OR VETERINARY SCIENCE</subject><subject>METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL</subject><subject>MUSICAL INSTRUMENTS</subject><subject>ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES</subject><subject>PHYSICS</subject><subject>PROSTHESES</subject><subject>SOUND-PRODUCING DEVICES</subject><subject>TREATMENT OR PROTECTION OF EYES OR EARS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1991</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZBDzy88sTlUoSk0pTS7JzM9TKK4sLknN5WFgTUvMKU7lhdLcDPJuriHOHrqpBfnxqcUFicmpeakl8e5ORkbGJhYWRo7GhFUAAC50INM</recordid><startdate>19910213</startdate><enddate>19910213</enddate><creator>ANTHONY JOHN SALLOWAY</creator><scope>EVB</scope></search><sort><creationdate>19910213</creationdate><title>Noise reduction system</title><author>ANTHONY JOHN SALLOWAY</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_GB2234882A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1991</creationdate><topic>ACOUSTICS</topic><topic>ACOUSTICS NOT OTHERWISE PROVIDED FOR</topic><topic>BANDAGES, DRESSINGS OR ABSORBENT PADS</topic><topic>DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS</topic><topic>FILTERS IMPLANTABLE INTO BLOOD VESSELS</topic><topic>FIRST-AID KITS</topic><topic>FOMENTATION</topic><topic>HUMAN NECESSITIES</topic><topic>HYGIENE</topic><topic>MEDICAL OR VETERINARY SCIENCE</topic><topic>METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL</topic><topic>MUSICAL INSTRUMENTS</topic><topic>ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES</topic><topic>PHYSICS</topic><topic>PROSTHESES</topic><topic>SOUND-PRODUCING DEVICES</topic><topic>TREATMENT OR PROTECTION OF EYES OR EARS</topic><toplevel>online_resources</toplevel><creatorcontrib>ANTHONY JOHN SALLOWAY</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>ANTHONY JOHN SALLOWAY</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Noise reduction system</title><date>1991-02-13</date><risdate>1991</risdate><abstract>An active noise reduction system for an earphone 1 or ear defender, the system comprising a noise reduction sound generator 14, a microphone 5 acoustically coupled to said generator, a feedback loop connected between the microphone and generator, and including loop stabilisation means 6, 7 for filtering and inverting the phase of a microphone signal and means 12 for amplifying the signal, the sound generator 14 being mounted within an earphone or oar defender on a partition wall 16 between a rear cavity which is closed and a front cavity which is closed only when the structure is supported against a user's ear, in which the partition wall 16 is provided with an air vent hole 9 effective to equalise air pressure across the wall such that the effect of a large acoustic pressure pulse in the front cavity will be reduced in amplitude and thereby prevented from causing significant displacement of a diaphragm of sound generator 14, the diaphragm thus being able to be driven solely by the applied electrical signals. This restrains the effects of large external pressure pulses or buffets from causing damage to the diaphragm.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR BANDAGES, DRESSINGS OR ABSORBENT PADS DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION HUMAN NECESSITIES HYGIENE MEDICAL OR VETERINARY SCIENCE METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PHYSICS PROSTHESES SOUND-PRODUCING DEVICES TREATMENT OR PROTECTION OF EYES OR EARS |
| title | Noise reduction system |
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